Convert.ToInt32 Convert.ToInt32 Convert.ToInt32 Convert.ToInt32 Method

Definición

Convierte un valor especificado en un entero de 32 bits con signo.Converts a specified value to a 32-bit signed integer.

Sobrecargas

ToInt32(Single) ToInt32(Single) ToInt32(Single) ToInt32(Single)

Convierte el valor del número de punto flotante de precisión sencilla especificado en un entero de 32 bits con signo equivalente.Converts the value of the specified single-precision floating-point number to an equivalent 32-bit signed integer.

ToInt32(String) ToInt32(String) ToInt32(String) ToInt32(String)

Convierte la representación de cadena especificada de un número en un entero de 32 bits con signo equivalente.Converts the specified string representation of a number to an equivalent 32-bit signed integer.

ToInt32(UInt32) ToInt32(UInt32) ToInt32(UInt32) ToInt32(UInt32)

Convierte el valor del entero de 32 bits sin signo especificado en un entero de 32 bits con signo equivalente.Converts the value of the specified 32-bit unsigned integer to an equivalent 32-bit signed integer.

ToInt32(SByte) ToInt32(SByte) ToInt32(SByte) ToInt32(SByte)

Convierte el valor del entero de 8 bits con signo especificado en un entero de 32 bits con signo equivalente.Converts the value of the specified 8-bit signed integer to the equivalent 32-bit signed integer.

ToInt32(Object, IFormatProvider) ToInt32(Object, IFormatProvider) ToInt32(Object, IFormatProvider) ToInt32(Object, IFormatProvider)

Convierte el valor del objeto especificado en un entero de 32 bits con signo, usando la información de formato específica de la referencia cultural indicada.Converts the value of the specified object to a 32-bit signed integer, using the specified culture-specific formatting information.

ToInt32(String, IFormatProvider) ToInt32(String, IFormatProvider) ToInt32(String, IFormatProvider) ToInt32(String, IFormatProvider)

Convierte la representación de cadena especificada de un número en un entero de 32 bits con signo equivalente, usando la información de formato específica de la referencia cultural indicada.Converts the specified string representation of a number to an equivalent 32-bit signed integer, using the specified culture-specific formatting information.

ToInt32(String, Int32) ToInt32(String, Int32) ToInt32(String, Int32) ToInt32(String, Int32)

Convierte la representación de cadena de un número en una base especificada en un entero de 32 bits con signo equivalente.Converts the string representation of a number in a specified base to an equivalent 32-bit signed integer.

ToInt32(UInt64) ToInt32(UInt64) ToInt32(UInt64) ToInt32(UInt64)

Convierte el valor del entero de 64 bits sin signo especificado en un entero de 32 bits con signo equivalente.Converts the value of the specified 64-bit unsigned integer to an equivalent 32-bit signed integer.

ToInt32(Object) ToInt32(Object) ToInt32(Object) ToInt32(Object)

Convierte el valor del objeto especificado en un entero de 32 bits con signo.Converts the value of the specified object to a 32-bit signed integer.

ToInt32(UInt16) ToInt32(UInt16) ToInt32(UInt16) ToInt32(UInt16)

Convierte el valor del entero de 16 bits sin signo especificado en un entero de 32 bits con signo equivalente.Converts the value of the specified 16-bit unsigned integer to the equivalent 32-bit signed integer.

ToInt32(Int32) ToInt32(Int32) ToInt32(Int32) ToInt32(Int32)

Devuelve el entero de 32 bits con signo especificado; no se efectúa una conversión real.Returns the specified 32-bit signed integer; no actual conversion is performed.

ToInt32(Byte) ToInt32(Byte) ToInt32(Byte) ToInt32(Byte)

Convierte el valor del entero de 8 bits sin signo especificado en un entero de 32 bits con signo equivalente.Converts the value of the specified 8-bit unsigned integer to the equivalent 32-bit signed integer.

ToInt32(Char) ToInt32(Char) ToInt32(Char) ToInt32(Char)

Convierte el valor del carácter Unicode especificado en un entero de 32 bits con signo equivalente.Converts the value of the specified Unicode character to the equivalent 32-bit signed integer.

ToInt32(DateTime) ToInt32(DateTime) ToInt32(DateTime) ToInt32(DateTime)

Cuando se llama a este método, siempre se produce InvalidCastException.Calling this method always throws InvalidCastException.

ToInt32(Boolean) ToInt32(Boolean) ToInt32(Boolean) ToInt32(Boolean)

Convierte el valor booleano especificado en un entero de 32 bits con signo equivalente.Converts the specified Boolean value to the equivalent 32-bit signed integer.

ToInt32(Int64) ToInt32(Int64) ToInt32(Int64) ToInt32(Int64)

Convierte el valor del entero de 64 bits con signo especificado en un entero de 32 bits con signo equivalente.Converts the value of the specified 64-bit signed integer to an equivalent 32-bit signed integer.

ToInt32(Double) ToInt32(Double) ToInt32(Double) ToInt32(Double)

Convierte el valor del número de punto flotante de precisión doble especificado en un entero de 32 bits con signo equivalente.Converts the value of the specified double-precision floating-point number to an equivalent 32-bit signed integer.

ToInt32(Int16) ToInt32(Int16) ToInt32(Int16) ToInt32(Int16)

Convierte el valor del entero de 16 bits con signo especificado en un entero de 32 bits con signo equivalente.Converts the value of the specified 16-bit signed integer to an equivalent 32-bit signed integer.

ToInt32(Decimal) ToInt32(Decimal) ToInt32(Decimal) ToInt32(Decimal)

Convierte el valor del número decimal especificado en un entero de 32 bits con signo equivalente.Converts the value of the specified decimal number to an equivalent 32-bit signed integer.

ToInt32(Single) ToInt32(Single) ToInt32(Single) ToInt32(Single)

Convierte el valor del número de punto flotante de precisión sencilla especificado en un entero de 32 bits con signo equivalente.Converts the value of the specified single-precision floating-point number to an equivalent 32-bit signed integer.

public:
 static int ToInt32(float value);
public static int ToInt32 (float value);
static member ToInt32 : single -> int
Public Shared Function ToInt32 (value As Single) As Integer

Parámetros

value
Single Single Single Single

Número de punto flotante de precisión sencilla que se va a convertir.The single-precision floating-point number to convert.

Devoluciones

value, redondeado al entero de 32 bits con signo más próximo.value, rounded to the nearest 32-bit signed integer. Si value está en medio de dos números enteros, se devuelve el número par, es decir, 4,5 se convierte en 4 y 5,5 se convierte en 6.If value is halfway between two whole numbers, the even number is returned; that is, 4.5 is converted to 4, and 5.5 is converted to 6.

Excepciones

value es mayor que MaxValue o menor que MinValue.value is greater than MaxValue or less than MinValue.

Ejemplos

En el ejemplo siguiente se intenta convertir cada elemento de una matriz Single de valores en un entero.The following example attempts to convert each element in an array of Single values to an integer.

float[] values= { Single.MinValue, -1.38e10f, -1023.299f, -12.98f,
                  0f, 9.113e-16f, 103.919f, 17834.191f, Single.MaxValue };
int result;

foreach (float value in values)
{
   try {
      result = Convert.ToInt32(value);
      Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.",
                        value.GetType().Name, value, result.GetType().Name, result);
   }
   catch (OverflowException) {
      Console.WriteLine("{0} is outside the range of the Int32 type.", value);
   }   
}                                 
// The example displays the following output:
//    -3.40282346638529E+38 is outside the range of the Int32 type.
//    -13799999488 is outside the range of the Int32 type.
//    Converted the Double value -1023.29901123047 to the Int32 value -1023.
//    Converted the Double value -12.9799995422363 to the Int32 value -13.
//    Converted the Double value 0 to the Int32 value 0.
//    Converted the Double value 9.11299983940444E-16 to the Int32 value 0.
//    Converted the Double value 103.918998718262 to the Int32 value 104.
//    Converted the Double value 17834.19140625 to the Int32 value 17834.
//    3.40282346638529E+38 is outside the range of the Int32 type.
Dim values() As Single = { Single.MinValue, -1.38e10, -1023.299, -12.98, _
                           0, 9.113e-16, 103.919, 17834.191, Single.MaxValue }
Dim result As Integer

For Each value As Single In values
   Try
      result = Convert.ToInt32(value)
      Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.", _
                        value.GetType().Name, value, result.GetType().Name, result)
   Catch e As OverflowException
      Console.WriteLine("{0} is outside the range of the Int32 type.", value)
   End Try   
Next                                 
' The example displays the following output:
'    -3.40282346638529E+38 is outside the range of the Int32 type.
'    -13799999488 is outside the range of the Int32 type.
'    Converted the Double value -1023.29901123047 to the Int32 value -1023.
'    Converted the Double value -12.9799995422363 to the Int32 value -13.
'    Converted the Double value 0 to the Int32 value 0.
'    Converted the Double value 9.11299983940444E-16 to the Int32 value 0.
'    Converted the Double value 103.918998718262 to the Int32 value 104.
'    Converted the Double value 17834.19140625 to the Int32 value 17834.
'    3.40282346638529E+38 is outside the range of the Int32 type.
Consulte también:

ToInt32(String) ToInt32(String) ToInt32(String) ToInt32(String)

Convierte la representación de cadena especificada de un número en un entero de 32 bits con signo equivalente.Converts the specified string representation of a number to an equivalent 32-bit signed integer.

public:
 static int ToInt32(System::String ^ value);
public static int ToInt32 (string value);
static member ToInt32 : string -> int
Public Shared Function ToInt32 (value As String) As Integer

Parámetros

value
String String String String

Cadena que contiene el número que se va a convertir.A string that contains the number to convert.

Devoluciones

Un entero de 32 bits con signo equivalente al número de value, o 0 (cero) si value es null.A 32-bit signed integer that is equivalent to the number in value, or 0 (zero) if value is null.

Excepciones

value no está formado por un signo opcional seguido de una secuencia de dígitos (de 0 a 9).value does not consist of an optional sign followed by a sequence of digits (0 through 9).

value representa un número menor que MinValue o mayor que MaxValue.value represents a number that is less than MinValue or greater than MaxValue.

Ejemplos

En el ejemplo siguiente se intenta convertir cada elemento de una matriz de cadenas numérica en un entero.The following example attempts to convert each element in a numeric string array to an integer.

string[] values = { "One", "1.34e28", "-26.87", "-18", "-6.00",
                    " 0", "137", "1601.9", Int32.MaxValue.ToString() };
int result;

foreach (string value in values)
{
   try {
      result = Convert.ToInt32(value);
      Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.",
                        value.GetType().Name, value, result.GetType().Name, result);
   }
   catch (OverflowException) {
      Console.WriteLine("{0} is outside the range of the Int32 type.", value);
   }   
   catch (FormatException) {
      Console.WriteLine("The {0} value '{1}' is not in a recognizable format.",
                        value.GetType().Name, value);
   }   
}                                 
// The example displays the following output:
//    The String value 'One' is not in a recognizable format.
//    The String value '1.34e28' is not in a recognizable format.
//    The String value '-26.87' is not in a recognizable format.
//    Converted the String value '-18' to the Int32 value -18.
//    The String value '-6.00' is not in a recognizable format.
//    Converted the String value ' 0' to the Int32 value 0.
//    Converted the String value '137' to the Int32 value 137.
//    The String value '1601.9' is not in a recognizable format.
//    Converted the String value '2147483647' to the Int32 value 2147483647.
Dim values() As String = { "One", "1.34e28", "-26.87", "-18", "-6.00", _
                           " 0", "137", "1601.9", Int32.MaxValue.ToString() }
Dim result As Integer

For Each value As String In values
   Try
      result = Convert.ToInt32(value)
      Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.", _
                        value.GetType().Name, value, result.GetType().Name, result)
   Catch e As OverflowException
      Console.WriteLine("{0} is outside the range of the Int32 type.", value)
   Catch e As FormatException
      Console.WriteLine("The {0} value '{1}' is not in a recognizable format.", _
                        value.GetType().Name, value)
   End Try   
Next                                 
' The example displays the following output:
'    The String value 'One' is not in a recognizable format.
'    The String value '1.34e28' is not in a recognizable format.
'    The String value '-26.87' is not in a recognizable format.
'    Converted the String value '-18' to the Int32 value -18.
'    The String value '-6.00' is not in a recognizable format.
'    Converted the String value ' 0' to the Int32 value 0.
'    Converted the String value '137' to the Int32 value 137.
'    The String value '1601.9' is not in a recognizable format.
'    Converted the String value '2147483647' to the Int32 value 2147483647.

Comentarios

Usar el ToInt32(String) método equivale a pasar value al Int32.Parse(String) método.valueUsing the ToInt32(String) method is equivalent to passing value to the Int32.Parse(String) method.value se interpreta mediante las convenciones de formato de la referencia cultural del subproceso actual.is interpreted by using the formatting conventions of the current thread culture.

Si prefiere no controlar una excepción si se produce un error en la conversión, puede llamar Int32.TryParse al método en su lugar.If you prefer not to handle an exception if the conversion fails, you can call the Int32.TryParse method instead. Devuelve un Boolean valor que indica si la conversión se realizó correctamente o no.It returns a Boolean value that indicates whether the conversion succeeded or failed.

ToInt32(UInt32) ToInt32(UInt32) ToInt32(UInt32) ToInt32(UInt32)

Importante

Esta API no es conforme a CLS.

Convierte el valor del entero de 32 bits sin signo especificado en un entero de 32 bits con signo equivalente.Converts the value of the specified 32-bit unsigned integer to an equivalent 32-bit signed integer.

public:
 static int ToInt32(System::UInt32 value);
[System.CLSCompliant(false)]
public static int ToInt32 (uint value);
static member ToInt32 : uint32 -> int
Public Shared Function ToInt32 (value As UInteger) As Integer

Parámetros

value
UInt32 UInt32 UInt32 UInt32

Entero de 32 bits sin signo que se va a convertir.The 32-bit unsigned integer to convert.

Devoluciones

Un entero de 32 bits con signo equivalente a value.A 32-bit signed integer that is equivalent to value.

Excepciones

Ejemplos

En el ejemplo siguiente se intenta convertir cada elemento de una matriz de enteros sin signo en un entero con signo.The following example attempts to convert each element in an array of unsigned integers to a signed integer.

uint[] numbers = { UInt32.MinValue, 121, 340, UInt32.MaxValue };
int result;
foreach (uint number in numbers)
{
   try {
      result = Convert.ToInt32(number);
      Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.",
                        number.GetType().Name, number,
                        result.GetType().Name, result);
   }
   catch (OverflowException) {
      Console.WriteLine("The {0} value {1} is outside the range of the Int32 type.",
                        number.GetType().Name, number);
   }
}
// The example displays the following output:
//    Converted the UInt32 value 0 to the Int32 value 0.
//    Converted the UInt32 value 121 to the Int32 value 121.
//    Converted the UInt32 value 340 to the Int32 value 340.
//    The UInt32 value 4294967295 is outside the range of the Int32 type.
Dim numbers() As UInteger = { UInt32.MinValue, 121, 340, UInt32.MaxValue }
Dim result As Integer
For Each number As UInteger In numbers
   Try
      result = Convert.ToInt32(number)
      Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.", _
                        number.GetType().Name, number, _
                        result.GetType().Name, result)
   Catch e As OverflowException
      Console.WriteLine("The {0} value {1} is outside the range of the Int32 type.", _
                        number.GetType().Name, number)
   End Try
Next
' The example displays the following output:
'    Converted the UInt32 value 0 to the Int32 value 0.
'    Converted the UInt32 value 121 to the Int32 value 121.
'    Converted the UInt32 value 340 to the Int32 value 340.
'    The UInt32 value 4294967295 is outside the range of the Int32 type.

ToInt32(SByte) ToInt32(SByte) ToInt32(SByte) ToInt32(SByte)

Importante

Esta API no es conforme a CLS.

Convierte el valor del entero de 8 bits con signo especificado en un entero de 32 bits con signo equivalente.Converts the value of the specified 8-bit signed integer to the equivalent 32-bit signed integer.

public:
 static int ToInt32(System::SByte value);
[System.CLSCompliant(false)]
public static int ToInt32 (sbyte value);
static member ToInt32 : sbyte -> int
Public Shared Function ToInt32 (value As SByte) As Integer

Parámetros

value
SByte SByte SByte SByte

Entero de 8 bits con signo que se va a convertir.The 8-bit signed integer to convert.

Devoluciones

Un entero de 8 bits con signo equivalente a value.A 8-bit signed integer that is equivalent to value.

Ejemplos

En el siguiente ejemplo se convierte cada elemento de una matriz de bytes con signo en un entero.The following example converts each element in an array of signed bytes to an integer.

sbyte[] numbers = { SByte.MinValue, -1, 0, 10, SByte.MaxValue };
int result;

foreach (sbyte number in numbers)
{
   result = Convert.ToInt32(number);
   Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.",
                     number.GetType().Name, number,
                     result.GetType().Name, result);
}
// The example displays the following output:
//       Converted the SByte value -128 to the Int32 value -128.
//       Converted the SByte value -1 to the Int32 value -1.
//       Converted the SByte value 0 to the Int32 value 0.
//       Converted the SByte value 10 to the Int32 value 10.
//       Converted the SByte value 127 to the Int32 value 127.
Dim numbers() As SByte = { SByte.MinValue, -1, 0, 10, SByte.MaxValue }
Dim result As Integer

For Each number As SByte In numbers
   result = Convert.ToInt32(number)
   Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.", _
                     number.GetType().Name, number, _
                     result.GetType().Name, result)
Next
' The example displays the following output:
'       Converted the SByte value -128 to the Int32 value -128.
'       Converted the SByte value -1 to the Int32 value -1.
'       Converted the SByte value 0 to the Int32 value 0.
'       Converted the SByte value 10 to the Int32 value 10.
'       Converted the SByte value 127 to the Int32 value 127.

ToInt32(Object, IFormatProvider) ToInt32(Object, IFormatProvider) ToInt32(Object, IFormatProvider) ToInt32(Object, IFormatProvider)

Convierte el valor del objeto especificado en un entero de 32 bits con signo, usando la información de formato específica de la referencia cultural indicada.Converts the value of the specified object to a 32-bit signed integer, using the specified culture-specific formatting information.

public:
 static int ToInt32(System::Object ^ value, IFormatProvider ^ provider);
public static int ToInt32 (object value, IFormatProvider provider);
static member ToInt32 : obj * IFormatProvider -> int
Public Shared Function ToInt32 (value As Object, provider As IFormatProvider) As Integer

Parámetros

value
Object Object Object Object

Objeto que implementa la interfaz IConvertible.An object that implements the IConvertible interface.

provider
IFormatProvider IFormatProvider IFormatProvider IFormatProvider

Objeto que proporciona información de formato específica de la referencia cultural.An object that supplies culture-specific formatting information.

Devoluciones

Un entero de 32 bits con signo equivalente a value, o cero si value es null.A 32-bit signed integer that is equivalent to value, or zero if value is null.

Excepciones

value no tiene un formato adecuado.value is not in an appropriate format.

value representa un número menor que MinValue o mayor que MaxValue.value represents a number that is less than MinValue or greater than MaxValue.

Ejemplos

En el ejemplo siguiente se define una clase que IConvertible implementa y una clase que IFormatProviderimplementa.The following example defines a class that implements IConvertible and a class that implements IFormatProvider. Los objetos de la clase que implementa IConvertible contienen una matriz de Double valores.Objects of the class that implements IConvertible hold an array of Double values. Un objeto de cada clase se pasa al ToInt32 método.An object of each class is passed to the ToInt32 method. Este método devuelve un promedio de la matriz de Double valores, utilizando el objeto que IFormatProvider implementa para determinar cómo calcular el promedio.This method returns an average of the array of Double values, using the object that implements IFormatProvider to determine how to calculate the average.

using namespace System;
using namespace System::Collections;

// Define the types of averaging available in the class 
// implementing IConvertible.
public enum class AverageType : short
{
   None = 0,
   GeometricMean = 1,
   ArithmeticMean = 2,
   Median = 3
};


// Pass an instance of this class to methods that require an 
// IFormatProvider. The class instance determines the type of 
// average to calculate.
ref class AverageInfo: public IFormatProvider
{
protected:
   AverageType AvgType;

public:

   // Specify the type of averaging in the constructor.
   AverageInfo( AverageType avgType )
   {
      this->AvgType = avgType;
   }


   // This method returns a reference to the containing object 
   // if an object of AverageInfo type is requested. 
   virtual Object^ GetFormat( Type^ argType )
   {
      if ( argType == AverageInfo::typeid)
            return this;
      else
            return (Object^)0;
   }


   property AverageType TypeOfAverage 
   {

      // Use this property to set or get the type of averaging.
      AverageType get()
      {
         return this->AvgType;
      }

      void set( AverageType value )
      {
         this->AvgType = value;
      }

   }

};


// This class encapsulates an array of double values and implements 
// the IConvertible interface. Most of the IConvertible methods 
// return an average of the array elements in one of three types: 
// arithmetic mean, geometric mean, or median. 
ref class DataSet: public IConvertible
{
private:
   static Object^ null = nullptr;

protected:
   ArrayList^ data;
   AverageInfo^ defaultProvider;

   // This method unboxes a boxed double.
   double UnBoxDouble( Object^ obj )
   {
      return  *static_cast<double^>(obj);
   }


public:

   // Construct the object and add an initial list of values.
   // Create a default format provider.
   DataSet( ... array<Double>^values )
   {
      data = gcnew ArrayList( (Array^)values );
      defaultProvider = gcnew AverageInfo( AverageType::ArithmeticMean );
   }


   // Add additional values with this method.
   int Add( double value )
   {
      data->Add( value );
      return data->Count;
   }


   property double Item[ int ]
   {

      // Get, set, and add values with this indexer property.
      double get( int index )
      {
         if ( index >= 0 && index < data->Count )
                  return UnBoxDouble( data[ index ] );
         else
                  throw gcnew InvalidOperationException( "[DataSet.get] Index out of range." );
      }

      void set( int index, double value )
      {
         if ( index >= 0 && index < data->Count )
                  data[ index ] = value;
         else
         if ( index == data->Count )
                  data->Add( value );
         else
                  throw gcnew InvalidOperationException( "[DataSet.set] Index out of range." );
      }

   }

   property int Count 
   {

      // This property returns the number of elements in the object.
      int get()
      {
         return data->Count;
      }

   }

protected:

   // This method calculates the average of the object's elements.
   double Average( AverageType avgType )
   {
      double SumProd;
      if ( data->Count == 0 )
            return 0.0;

      switch ( avgType )
      {
         case AverageType::GeometricMean:
            SumProd = 1.0;
            for ( int Index = 0; Index < data->Count; Index++ )
               SumProd *= UnBoxDouble( data[ Index ] );
            
            // This calculation will not fail with negative 
            // elements.
            return Math::Sign( SumProd ) * Math::Pow( Math::Abs( SumProd ), 1.0 / data->Count );

         case AverageType::ArithmeticMean:
            SumProd = 0.0;
            for ( int Index = 0; Index < data->Count; Index++ )
               SumProd += UnBoxDouble( data[ Index ] );
            return SumProd / data->Count;

         case AverageType::Median:
            if ( data->Count % 2 == 0 )
                        return (UnBoxDouble( data[ data->Count / 2 ] ) + UnBoxDouble( data[ data->Count / 2 - 1 ] )) / 2.0;
            else
                        return UnBoxDouble( data[ data->Count / 2 ] );

         default:
            return 0.0;
      }
   }


   // Get the AverageInfo object from the caller's format provider,
   // or use the local default.
   AverageInfo^ GetAverageInfo( IFormatProvider^ provider )
   {
      AverageInfo^ avgInfo = nullptr;
      if ( provider != nullptr )
            avgInfo = static_cast<AverageInfo^>(provider->GetFormat( AverageInfo::typeid ));

      if ( avgInfo == nullptr )
            return defaultProvider;
      else
            return avgInfo;
   }


   // Calculate the average and limit the range.
   double CalcNLimitAverage( double min, double max, IFormatProvider^ provider )
   {
      
      // Get the format provider and calculate the average.
      AverageInfo^ avgInfo = GetAverageInfo( provider );
      double avg = Average( avgInfo->TypeOfAverage );
      
      // Limit the range, based on the minimum and maximum values 
      // for the type.
      return avg > max ? max : avg < min ? min : avg;
   }


public:

   // The following elements are required by IConvertible.
   // None of these conversion functions throw exceptions. When
   // the data is out of range for the type, the appropriate
   // MinValue or MaxValue is used.
   virtual TypeCode GetTypeCode()
   {
      return TypeCode::Object;
   }

   virtual bool ToBoolean( IFormatProvider^ provider )
   {
      
      // ToBoolean is false if the dataset is empty.
      if ( data->Count <= 0 )
            return false;
      // For median averaging, ToBoolean is true if any 
      // non-discarded elements are nonzero.
      else
      
      // For median averaging, ToBoolean is true if any 
      // non-discarded elements are nonzero.
      if ( AverageType::Median == GetAverageInfo( provider )->TypeOfAverage )
      {
         if ( data->Count % 2 == 0 )
                  return (UnBoxDouble( data[ data->Count / 2 ] ) != 0.0 || UnBoxDouble( data[ data->Count / 2 - 1 ] ) != 0.0);
         else
                  return UnBoxDouble( data[ data->Count / 2 ] ) != 0.0;
      }
      // For arithmetic or geometric mean averaging, ToBoolean is 
      // true if any element of the dataset is nonzero.  
      else
      {
         for ( int Index = 0; Index < data->Count; Index++ )
            if ( UnBoxDouble( data[ Index ] ) != 0.0 )
                        return true;
         return false;
      }
   }

   virtual Byte ToByte( IFormatProvider^ provider )
   {
      return Convert::ToByte( CalcNLimitAverage( Byte::MinValue, Byte::MaxValue, provider ) );
   }

   virtual Char ToChar( IFormatProvider^ provider )
   {
      return Convert::ToChar( Convert::ToUInt16( CalcNLimitAverage( Char::MinValue, Char::MaxValue, provider ) ) );
   }


   // Convert to DateTime by adding the calculated average as 
   // seconds to the current date and time. A valid DateTime is 
   // always returned.
   virtual DateTime ToDateTime( IFormatProvider^ provider )
   {
      double seconds = Average( GetAverageInfo( provider )->TypeOfAverage );
      try
      {
         return DateTime::Now.AddSeconds( seconds );
      }
      catch ( ArgumentOutOfRangeException^ ) 
      {
         return seconds < 0.0 ? DateTime::MinValue : DateTime::MaxValue;
      }

   }

   virtual Decimal ToDecimal( IFormatProvider^ provider )
   {
      
      // The Double conversion rounds Decimal.MinValue and 
      // Decimal.MaxValue to invalid Decimal values, so the 
      // following limits must be used.
      return Convert::ToDecimal( CalcNLimitAverage(  -79228162514264330000000000000.0, 79228162514264330000000000000.0, provider ) );
   }

   virtual double ToDouble( IFormatProvider^ provider )
   {
      return Average( GetAverageInfo( provider )->TypeOfAverage );
   }

   virtual short ToInt16( IFormatProvider^ provider )
   {
      return Convert::ToInt16( CalcNLimitAverage( Int16::MinValue, Int16::MaxValue, provider ) );
   }

   virtual int ToInt32( IFormatProvider^ provider )
   {
      return Convert::ToInt32( CalcNLimitAverage( Int32::MinValue, Int32::MaxValue, provider ) );
   }

   virtual __int64 ToInt64( IFormatProvider^ provider )
   {
      
      // The Double conversion rounds Int64.MinValue and 
      // Int64.MaxValue to invalid Int64 values, so the following 
      // limits must be used.
      return Convert::ToInt64( CalcNLimitAverage(  -9223372036854775000, 9223372036854775000, provider ) );
   }

   virtual signed char ToSByte( IFormatProvider^ provider )
   {
      return Convert::ToSByte( CalcNLimitAverage( SByte::MinValue, SByte::MaxValue, provider ) );
   }

   virtual float ToSingle( IFormatProvider^ provider )
   {
      return Convert::ToSingle( CalcNLimitAverage( Single::MinValue, Single::MaxValue, provider ) );
   }

   virtual UInt16 ToUInt16( IFormatProvider^ provider )
   {
      return Convert::ToUInt16( CalcNLimitAverage( UInt16::MinValue, UInt16::MaxValue, provider ) );
   }

   virtual UInt32 ToUInt32( IFormatProvider^ provider )
   {
      return Convert::ToUInt32( CalcNLimitAverage( UInt32::MinValue, UInt32::MaxValue, provider ) );
   }

   virtual UInt64 ToUInt64( IFormatProvider^ provider )
   {
      
      // The Double conversion rounds UInt64.MaxValue to an invalid
      // UInt64 value, so the following limit must be used.
      return Convert::ToUInt64( CalcNLimitAverage( 0, 18446744073709550000.0, provider ) );
   }

   virtual Object^ ToType( Type^ conversionType, IFormatProvider^ provider )
   {
      return Convert::ChangeType( Average( GetAverageInfo( provider )->TypeOfAverage ), conversionType );
   }

   virtual String^ ToString( IFormatProvider^ provider )
   {
      AverageType avgType = GetAverageInfo( provider )->TypeOfAverage;
      return String::Format( "( {0}: {1:G10} )", avgType, Average( avgType ) );
   }

};


// Display a DataSet with three different format providers.
void DisplayDataSet( DataSet^ ds )
{
   IFormatProvider^ null = nullptr;
   String^ fmt = "{0,-12}{1,20}{2,20}{3,20}";
   AverageInfo^ median = gcnew AverageInfo( AverageType::Median );
   AverageInfo^ geMean = gcnew AverageInfo( AverageType::GeometricMean );
   
   // Display the dataset elements.
   if ( ds->Count > 0 )
   {
      Console::Write( "\nDataSet: [{0}", ds->Item[ 0 ] );
      for ( int iX = 1; iX < ds->Count; iX++ )
         Console::Write( ", {0}", ds->Item[ iX ] );
      Console::WriteLine( "]\n" );
   }

   Console::WriteLine( fmt, "Convert::", "Default", "Geometric Mean", "Median" );
   Console::WriteLine( fmt, "---------", "-------", "--------------", "------" );
   Console::WriteLine( fmt, "ToBoolean", Convert::ToBoolean( ds, null ), Convert::ToBoolean( ds, geMean ), Convert::ToBoolean( ds, median ) );
   Console::WriteLine( fmt, "ToByte", Convert::ToByte( ds, null ), Convert::ToByte( ds, geMean ), Convert::ToByte( ds, median ) );
   Console::WriteLine( fmt, "ToChar", Convert::ToChar( ds, null ), Convert::ToChar( ds, geMean ), Convert::ToChar( ds, median ) );
   Console::WriteLine( "{0,-12}{1,20:yyyy-MM-dd HH:mm:ss}"
   "{2,20:yyyy-MM-dd HH:mm:ss}{3,20:yyyy-MM-dd HH:mm:ss}", "ToDateTime", Convert::ToDateTime( ds, null ), Convert::ToDateTime( ds, geMean ), Convert::ToDateTime( ds, median ) );
   Console::WriteLine( fmt, "ToDecimal", Convert::ToDecimal( ds, null ), Convert::ToDecimal( ds, geMean ), Convert::ToDecimal( ds, median ) );
   Console::WriteLine( fmt, "ToDouble", Convert::ToDouble( ds, null ), Convert::ToDouble( ds, geMean ), Convert::ToDouble( ds, median ) );
   Console::WriteLine( fmt, "ToInt16", Convert::ToInt16( ds, null ), Convert::ToInt16( ds, geMean ), Convert::ToInt16( ds, median ) );
   Console::WriteLine( fmt, "ToInt32", Convert::ToInt32( ds, null ), Convert::ToInt32( ds, geMean ), Convert::ToInt32( ds, median ) );
   Console::WriteLine( fmt, "ToInt64", Convert::ToInt64( ds, null ), Convert::ToInt64( ds, geMean ), Convert::ToInt64( ds, median ) );
   Console::WriteLine( fmt, "ToSByte", Convert::ToSByte( ds, null ), Convert::ToSByte( ds, geMean ), Convert::ToSByte( ds, median ) );
   Console::WriteLine( fmt, "ToSingle", Convert::ToSingle( ds, null ), Convert::ToSingle( ds, geMean ), Convert::ToSingle( ds, median ) );
   Console::WriteLine( fmt, "ToUInt16", Convert::ToUInt16( ds, null ), Convert::ToUInt16( ds, geMean ), Convert::ToUInt16( ds, median ) );
   Console::WriteLine( fmt, "ToUInt32", Convert::ToUInt32( ds, null ), Convert::ToUInt32( ds, geMean ), Convert::ToUInt32( ds, median ) );
   Console::WriteLine( fmt, "ToUInt64", Convert::ToUInt64( ds, null ), Convert::ToUInt64( ds, geMean ), Convert::ToUInt64( ds, median ) );
}

int main()
{
   Console::WriteLine( "This example of the "
   "Convert::To<Type>( Object*, IFormatProvider* ) methods "
   "\ngenerates the following output. The example "
   "displays the values \nreturned by the methods, "
   "using several IFormatProvider objects.\n" );
   
   // To call a [ParamArray] method in C++, you cannot just
   // list the parameters, you need to build an array.
   array<Double>^dataElem = gcnew array<Double>(6);
   dataElem[ 0 ] = 10.5;
   dataElem[ 1 ] = 22.2;
   dataElem[ 2 ] = 45.9;
   dataElem[ 3 ] = 88.7;
   dataElem[ 4 ] = 156.05;
   dataElem[ 5 ] = 297.6;
   DataSet^ ds1 = gcnew DataSet( dataElem );
   DisplayDataSet( ds1 );
   dataElem = gcnew array<Double>(5);
   dataElem[ 0 ] = 359999.95;
   dataElem[ 1 ] = 425000;
   dataElem[ 2 ] = 499999.5;
   dataElem[ 3 ] = 775000;
   dataElem[ 4 ] = 1695000;
   DataSet^ ds2 = gcnew DataSet( dataElem );
   DisplayDataSet( ds2 );
}

/*
This example of the Convert::To<Type>( Object*, IFormatProvider* ) methods
generates the following output. The example displays the values
returned by the methods, using several IFormatProvider objects.

DataSet: [10.5, 22.2, 45.9, 88.7, 156.05, 297.6]

Convert::                Default      Geometric Mean              Median
---------                -------      --------------              ------
ToBoolean                   True                True                True
ToByte                       103                  59                  67
ToChar                         g                   ;                   C
ToDateTime   2003-05-13 15:30:23 2003-05-13 15:29:39 2003-05-13 15:29:47
ToDecimal       103.491666666667    59.4332135445164                67.3
ToDouble        103.491666666667    59.4332135445164                67.3
ToInt16                      103                  59                  67
ToInt32                      103                  59                  67
ToInt64                      103                  59                  67
ToSByte                      103                  59                  67
ToSingle                103.4917            59.43321                67.3
ToUInt16                     103                  59                  67
ToUInt32                     103                  59                  67
ToUInt64                     103                  59                  67

DataSet: [359999.95, 425000, 499999.5, 775000, 1695000]

Convert::                Default      Geometric Mean              Median
---------                -------      --------------              ------
ToBoolean                   True                True                True
ToByte                       255                 255                 255
ToChar                         ?                   ?                   ?
ToDateTime   2003-05-22 08:05:19 2003-05-20 22:54:57 2003-05-19 10:21:59
ToDecimal              750999.89    631577.237188435            499999.5
ToDouble               750999.89    631577.237188435            499999.5
ToInt16                    32767               32767               32767
ToInt32                   751000              631577              500000
ToInt64                   751000              631577              500000
ToSByte                      127                 127                 127
ToSingle                750999.9            631577.3            499999.5
ToUInt16                   65535               65535               65535
ToUInt32                  751000              631577              500000
ToUInt64                  751000              631577              500000
*/
using System;
using System.Collections;

// Define the types of averaging available in the class 
// implementing IConvertible.
public enum AverageType : short
{
    None = 0,
    GeometricMean = 1,
    ArithmeticMean = 2,
    Median = 3
};

// Pass an instance of this class to methods that require an 
// IFormatProvider. The class instance determines the type of 
// average to calculate.
public class AverageInfo : IFormatProvider
{
    protected AverageType AvgType;

    // Specify the type of averaging in the constructor.
    public AverageInfo( AverageType avgType )
    {
        this.AvgType = avgType;
    }

    // This method returns a reference to the containing object 
    // if an object of AverageInfo type is requested. 
    public object GetFormat( Type argType )
    {
        if ( argType == typeof( AverageInfo ) )
            return this;
        else
            return null;
    }

    // Use this property to set or get the type of averaging.
    public AverageType TypeOfAverage        
    {
        get { return this.AvgType; }
        set { this.AvgType = value; }
    }
}

// This class encapsulates an array of double values and implements 
// the IConvertible interface. Most of the IConvertible methods 
// return an average of the array elements in one of three types: 
// arithmetic mean, geometric mean, or median. 
public class DataSet : IConvertible
{
    protected ArrayList     data;
    protected AverageInfo   defaultProvider;
        
    // Construct the object and add an initial list of values.
    // Create a default format provider.
    public DataSet( params double[ ] values )
    {
        data = new ArrayList( values );
        defaultProvider = 
            new AverageInfo( AverageType.ArithmeticMean );
    }
        
    // Add additional values with this method.
    public int Add( double value )
    {
        data.Add( value );
        return data.Count;
    }
        
    // Get, set, and add values with this indexer property.
    public double this[ int index ]        
    {
        get
        {
            if( index >= 0 && index < data.Count )
                return (double)data[ index ];
            else
                throw new InvalidOperationException(
                    "[DataSet.get] Index out of range." );
        }
        set
        {
            if( index >= 0 && index < data.Count )
                data[ index ] = value;

            else if( index == data.Count )
                data.Add( value );
            else
                throw new InvalidOperationException(
                    "[DataSet.set] Index out of range." );
        }
    }
        
    // This property returns the number of elements in the object.
    public int Count        
    {
        get { return data.Count; }
    }

    // This method calculates the average of the object's elements.
    protected double Average( AverageType avgType )
    {
        double  SumProd;

        if( data.Count == 0 ) 
            return 0.0;

        switch( avgType )
        {
            case AverageType.GeometricMean:

                SumProd = 1.0;
                for( int Index = 0; Index < data.Count; Index++ )
                    SumProd *= (double)data[ Index ];
                
                // This calculation will not fail with negative 
                // elements.
                return Math.Sign( SumProd ) * Math.Pow( 
                    Math.Abs( SumProd ), 1.0 / data.Count );

            case AverageType.ArithmeticMean:

                SumProd = 0.0;
                for( int Index = 0; Index < data.Count; Index++ )
                    SumProd += (double)data[ Index ];

                return SumProd / data.Count;

            case AverageType.Median:

                if( data.Count % 2 == 0 )
                    return ( (double)data[ data.Count / 2 ] + 
                        (double)data[ data.Count / 2 - 1 ] ) / 2.0;
                else
                    return (double)data[ data.Count / 2 ];

            default:
                return 0.0;
        }
    }

    // Get the AverageInfo object from the caller's format provider,
    // or use the local default.
    protected AverageInfo GetAverageInfo( IFormatProvider provider )
    {
        AverageInfo avgInfo = null;

        if( provider != null )
            avgInfo = (AverageInfo)provider.GetFormat( 
                typeof( AverageInfo ) );

        if ( avgInfo == null )
            return defaultProvider;
        else
            return avgInfo;
    }

    // Calculate the average and limit the range.
    protected double CalcNLimitAverage( double min, double max, 
        IFormatProvider provider )
    {
        // Get the format provider and calculate the average.
        AverageInfo avgInfo = GetAverageInfo( provider );
        double avg = Average( avgInfo.TypeOfAverage );

        // Limit the range, based on the minimum and maximum values 
        // for the type.
        return avg > max ? max : avg < min ? min : avg;

    }

    // The following elements are required by IConvertible.

    // None of these conversion functions throw exceptions. When
    // the data is out of range for the type, the appropriate
    // MinValue or MaxValue is used.
    public TypeCode GetTypeCode( )
    {
        return TypeCode.Object;
    }

    public bool ToBoolean( IFormatProvider provider )
    {
        // ToBoolean is false if the dataset is empty.
        if( data.Count <= 0 )
            return false;

        // For median averaging, ToBoolean is true if any 
        // non-discarded elements are nonzero.
        else if( AverageType.Median == 
            GetAverageInfo( provider ).TypeOfAverage )
        {
            if (data.Count % 2 == 0 )
                return ( (double)data[ data.Count / 2 ] != 0.0 || 
                    (double)data[ data.Count / 2 - 1 ] != 0.0 );
            else
                return (double)data[ data.Count / 2 ] != 0.0;
        }

        // For arithmetic or geometric mean averaging, ToBoolean is 
        // true if any element of the dataset is nonzero.  
        else
        {
            for( int Index = 0; Index < data.Count; Index++ )
                if( (double)data[ Index ] != 0.0 ) 
                    return true;
            return false;
        }
    }

    public byte ToByte( IFormatProvider provider )
    {
        return Convert.ToByte( CalcNLimitAverage( 
            Byte.MinValue, Byte.MaxValue, provider ) );
    }

    public char ToChar( IFormatProvider provider )
    {
        return Convert.ToChar( Convert.ToUInt16( CalcNLimitAverage( 
            Char.MinValue, Char.MaxValue, provider ) ) );
    }

    // Convert to DateTime by adding the calculated average as 
    // seconds to the current date and time. A valid DateTime is 
    // always returned.
    public DateTime ToDateTime( IFormatProvider provider )
    {
        double seconds = 
            Average( GetAverageInfo( provider ).TypeOfAverage );
        try
        {
            return DateTime.Now.AddSeconds( seconds );
        }
        catch( ArgumentOutOfRangeException )
        {
            return seconds < 0.0 ? DateTime.MinValue : DateTime.MaxValue;
        }
    }

    public decimal ToDecimal( IFormatProvider provider )
    {
        // The Double conversion rounds Decimal.MinValue and 
        // Decimal.MaxValue to invalid Decimal values, so the 
        // following limits must be used.
        return Convert.ToDecimal( CalcNLimitAverage( 
            -79228162514264330000000000000.0, 
            79228162514264330000000000000.0, provider ) );
    }

    public double ToDouble( IFormatProvider provider )
    {
        return Average( GetAverageInfo(provider).TypeOfAverage );
    }

    public short ToInt16( IFormatProvider provider )
    {
        return Convert.ToInt16( CalcNLimitAverage( 
            Int16.MinValue, Int16.MaxValue, provider ) );
    }

    public int ToInt32( IFormatProvider provider )
    {
        return Convert.ToInt32( CalcNLimitAverage( 
            Int32.MinValue, Int32.MaxValue, provider ) );
    }

    public long ToInt64( IFormatProvider provider )
    {
        // The Double conversion rounds Int64.MinValue and 
        // Int64.MaxValue to invalid Int64 values, so the following 
        // limits must be used.
        return Convert.ToInt64( CalcNLimitAverage( 
            -9223372036854775000, 9223372036854775000, provider ) );
    }

    public SByte ToSByte( IFormatProvider provider )
    {
        return Convert.ToSByte( CalcNLimitAverage( 
            SByte.MinValue, SByte.MaxValue, provider ) );
    }

    public float ToSingle( IFormatProvider provider )
    {
        return Convert.ToSingle( CalcNLimitAverage( 
            Single.MinValue, Single.MaxValue, provider ) );
    }

    public UInt16 ToUInt16( IFormatProvider provider )
    {
        return Convert.ToUInt16( CalcNLimitAverage( 
            UInt16.MinValue, UInt16.MaxValue, provider ) );
    }

    public UInt32 ToUInt32( IFormatProvider provider )
    {
        return Convert.ToUInt32( CalcNLimitAverage( 
            UInt32.MinValue, UInt32.MaxValue, provider ) );
    }

    public UInt64 ToUInt64( IFormatProvider provider )
    {
        // The Double conversion rounds UInt64.MaxValue to an invalid
        // UInt64 value, so the following limit must be used.
        return Convert.ToUInt64( CalcNLimitAverage( 
            0, 18446744073709550000.0, provider ) );
    }

    public object ToType( Type conversionType, 
        IFormatProvider provider )
    {
        return Convert.ChangeType( Average( 
            GetAverageInfo( provider ).TypeOfAverage ), 
            conversionType );
    }

    public string ToString( IFormatProvider provider )
    {
        AverageType avgType = GetAverageInfo( provider ).TypeOfAverage;
        return String.Format( "( {0}: {1:G10} )", avgType, 
            Average( avgType ) );
    }
}
   
class IConvertibleProviderDemo
{
    // Display a DataSet with three different format providers.
    public static void DisplayDataSet( DataSet ds )
    {
        string      fmt    = "{0,-12}{1,20}{2,20}{3,20}";
        AverageInfo median = new AverageInfo( AverageType.Median );
        AverageInfo geMean = 
            new AverageInfo( AverageType.GeometricMean );

         // Display the dataset elements.
        if( ds.Count > 0 )
        {
            Console.Write( "\nDataSet: [{0}", ds[ 0 ] );
            for( int iX = 1; iX < ds.Count; iX++ )
                Console.Write( ", {0}", ds[ iX ] );
            Console.WriteLine( "]\n" );
        }

        Console.WriteLine( fmt, "Convert.", "Default", 
            "Geometric Mean", "Median");
        Console.WriteLine( fmt, "--------", "-------", 
            "--------------", "------");
        Console.WriteLine( fmt, "ToBoolean", 
            Convert.ToBoolean( ds, null ), 
            Convert.ToBoolean( ds, geMean ), 
            Convert.ToBoolean( ds, median ) );
        Console.WriteLine( fmt, "ToByte", 
            Convert.ToByte( ds, null ), 
            Convert.ToByte( ds, geMean ), 
            Convert.ToByte( ds, median ) );
        Console.WriteLine( fmt, "ToChar", 
            Convert.ToChar( ds, null ), 
            Convert.ToChar( ds, geMean ), 
            Convert.ToChar( ds, median ) );
        Console.WriteLine( "{0,-12}{1,20:yyyy-MM-dd HH:mm:ss}" +
            "{2,20:yyyy-MM-dd HH:mm:ss}{3,20:yyyy-MM-dd HH:mm:ss}", 
            "ToDateTime", Convert.ToDateTime( ds, null ), 
            Convert.ToDateTime( ds, geMean ), 
            Convert.ToDateTime( ds, median ) );
        Console.WriteLine( fmt, "ToDecimal", 
            Convert.ToDecimal( ds, null ), 
            Convert.ToDecimal( ds, geMean ), 
            Convert.ToDecimal( ds, median ) );
        Console.WriteLine( fmt, "ToDouble", 
            Convert.ToDouble( ds, null ), 
            Convert.ToDouble( ds, geMean ), 
            Convert.ToDouble( ds, median ) );
        Console.WriteLine( fmt, "ToInt16", 
            Convert.ToInt16( ds, null ), 
            Convert.ToInt16( ds, geMean ), 
            Convert.ToInt16( ds, median ) );
        Console.WriteLine( fmt, "ToInt32", 
            Convert.ToInt32( ds, null ), 
            Convert.ToInt32( ds, geMean ), 
            Convert.ToInt32( ds, median ) );
        Console.WriteLine( fmt, "ToInt64", 
            Convert.ToInt64( ds, null ), 
            Convert.ToInt64( ds, geMean ), 
            Convert.ToInt64( ds, median ) );
        Console.WriteLine( fmt, "ToSByte", 
            Convert.ToSByte( ds, null ), 
            Convert.ToSByte( ds, geMean ), 
            Convert.ToSByte( ds, median ) );
        Console.WriteLine( fmt, "ToSingle", 
            Convert.ToSingle( ds, null ), 
            Convert.ToSingle( ds, geMean ), 
            Convert.ToSingle( ds, median ) );
        Console.WriteLine( fmt, "ToUInt16", 
            Convert.ToUInt16( ds, null ), 
            Convert.ToUInt16( ds, geMean ), 
            Convert.ToUInt16( ds, median ) );
        Console.WriteLine( fmt, "ToUInt32", 
            Convert.ToUInt32( ds, null ), 
            Convert.ToUInt32( ds, geMean ), 
            Convert.ToUInt32( ds, median ) );
        Console.WriteLine( fmt, "ToUInt64", 
            Convert.ToUInt64( ds, null ), 
            Convert.ToUInt64( ds, geMean ), 
            Convert.ToUInt64( ds, median ) );
    }
   
    public static void Main( )
    {
        Console.WriteLine( "This example of " +
            "the Convert.To<Type>( object, IFormatProvider ) methods " +
            "\ngenerates the following output. The example " +
            "displays the values \nreturned by the methods, " +
            "using several IFormatProvider objects.\n" );
          
        DataSet ds1 = new DataSet( 
            10.5, 22.2, 45.9, 88.7, 156.05, 297.6 );
        DisplayDataSet( ds1 );
          
        DataSet ds2 = new DataSet( 
            359999.95, 425000, 499999.5, 775000, 1695000 );
        DisplayDataSet( ds2 );
    }
}

/*
This example of the Convert.To<Type>( object, IFormatProvider ) methods
generates the following output. The example displays the values
returned by the methods, using several IFormatProvider objects.

DataSet: [10.5, 22.2, 45.9, 88.7, 156.05, 297.6]

Convert.                 Default      Geometric Mean              Median
--------                 -------      --------------              ------
ToBoolean                   True                True                True
ToByte                       103                  59                  67
ToChar                         g                   ;                   C
ToDateTime   2003-05-13 15:04:12 2003-05-13 15:03:28 2003-05-13 15:03:35
ToDecimal       103.491666666667    59.4332135445164                67.3
ToDouble        103.491666666667    59.4332135445164                67.3
ToInt16                      103                  59                  67
ToInt32                      103                  59                  67
ToInt64                      103                  59                  67
ToSByte                      103                  59                  67
ToSingle                103.4917            59.43321                67.3
ToUInt16                     103                  59                  67
ToUInt32                     103                  59                  67
ToUInt64                     103                  59                  67

DataSet: [359999.95, 425000, 499999.5, 775000, 1695000]

Convert.                 Default      Geometric Mean              Median
--------                 -------      --------------              ------
ToBoolean                   True                True                True
ToByte                       255                 255                 255
ToChar                         ?                   ?                   ?
ToDateTime   2003-05-22 07:39:08 2003-05-20 22:28:45 2003-05-19 09:55:48
ToDecimal              750999.89    631577.237188435            499999.5
ToDouble               750999.89    631577.237188435            499999.5
ToInt16                    32767               32767               32767
ToInt32                   751000              631577              500000
ToInt64                   751000              631577              500000
ToSByte                      127                 127                 127
ToSingle                750999.9            631577.3            499999.5
ToUInt16                   65535               65535               65535
ToUInt32                  751000              631577              500000
ToUInt64                  751000              631577              500000
*/
Imports System.Collections

Module IConvertibleProviderDemo

    ' Define the types of averaging available in the class 
    ' implementing IConvertible.
    Enum AverageType as Short
        None = 0
        GeometricMean = 1
        ArithmeticMean = 2
        Median = 3
    End Enum

    ' Pass an instance of this class to methods that require an 
    ' IFormatProvider. The class instance determines the type of 
    ' average to calculate.
    Public Class AverageInfo
        Implements IFormatProvider

        Protected  AvgType      As AverageType

        ' Specify the type of averaging in the constructor.
        Public Sub New( avgType As AverageType )
            Me.AvgType = avgType
        End Sub

        ' This method returns a reference to the containing object 
        ' if an object of AverageInfo type is requested. 
        Public Function GetFormat( argType As Type ) As Object _
            Implements IFormatProvider.GetFormat

            If argType Is GetType( AverageInfo ) Then
                Return Me
            Else
                Return Nothing
            End If
        End Function 

        ' Use this property to set or get the type of averaging.
        Public Property TypeOfAverage( ) As AverageType
            Get
                Return Me.AvgType
            End Get
            Set( ByVal value as AverageType )
                Me.AvgType = value
            End Set
        End Property
    End Class 

    ' This class encapsulates an array of Double values and implements 
    ' the IConvertible interface. Most of the IConvertible methods 
    ' return an average of the array elements in one of three types: 
    ' arithmetic mean, geometric mean, or median. 
    Public Class DataSet
        Implements IConvertible

        Protected data              As ArrayList
        Protected defaultProvider   As AverageInfo
           
        ' Construct the object and add an initial list of values.
        ' Create a default format provider.
        Public Sub New( ParamArray values( ) As Double )
            data = New ArrayList( values )
            defaultProvider = New AverageInfo( _
                AverageType.ArithmeticMean )  
        End Sub
           
        ' Add additional values with this method.
        Public Function Add( value As Double ) As Integer
            data.Add( value )
            Return data.Count
        End Function
           
        ' Get, set, and add values with this indexer property.
        Default Public Property Item(index As Integer) As Double
            Get
                If index >= 0 AndAlso index < data.Count Then
                    Return System.Convert.ToDouble( data( index ) )
                Else
                    Throw New InvalidOperationException( _
                        "[DataSet.get] Index out of range." )
                End If
            End Get
            Set
                If index >= 0 AndAlso index < data.Count Then
                    data( index ) = value
                 
                ElseIf index = data.Count Then
                    data.Add( value )
                Else
                    Throw New InvalidOperationException( _
                        "[DataSet.set] Index out of range." )
                End If
            End Set
        End Property
          
        ' This property returns the number of elements in the object.
        Public ReadOnly Property Count( ) As Integer
            Get
                Return data.Count
            End Get
        End Property

        ' This method calculates the average of the object's elements.
        Protected Function Average( ByVal avgType As AverageType ) As Double

            Dim SumProd As Double 
            Dim Index   As Integer

            If data.Count = 0 Then Return 0.0

            Select Case avgType
                
                Case AverageType.GeometricMean

                    SumProd = 1.0
                    For Index = 0 To data.Count - 1
                        SumProd *= data( Index )
                    Next Index
                    
                    ' This calculation will not fail with negative 
                    ' elements.
                    Return Math.Sign( SumProd ) * Math.Pow( _
                        Math.Abs( SumProd ), 1.0 / data.Count )

                Case AverageType.ArithmeticMean

                    SumProd = 0.0
                    For Index = 0 To data.Count - 1
                        SumProd += data( Index )
                    Next Index

                    Return SumProd / data.Count 

                Case AverageType.Median

                    If data.Count Mod 2 = 0 Then
                        Return ( data( data.Count \ 2 ) + _
                            data( data.Count \ 2 - 1 ) ) / 2.0
                    Else
                        Return data( data.Count \ 2 ) 
                    End If
            End Select
        End Function

        ' Get the AverageInfo object from the caller's format 
        ' provider, or use the local default.
        Protected Function GetAverageInfo( _
            provider As IFormatProvider ) As AverageInfo

            Dim avgInfo As AverageInfo = Nothing

            If Not provider Is Nothing Then
                avgInfo = provider.GetFormat( GetType( AverageInfo ) )
            End If

            Return IIf( avgInfo Is Nothing, defaultProvider, avgInfo )
            
        End Function           

        ' Calculate the average and limit the range.
        Protected Function CalcNLimitAverage( min As Double, _
            max As Double, provider as IFormatProvider ) As Double

            ' Get the format provider and calculate the average.
            Dim avgInfo As AverageInfo = GetAverageInfo( provider )
            Dim avg As Double = Average( avgInfo.TypeOfAverage )

            ' Limit the range, based on the minimum and maximum values 
            ' for the type.
            Return IIf( avg > max, max, IIf( avg < min, min, avg ) )

        End Function

        ' The following elements are required by IConvertible.

        ' None of these conversion functions throw exceptions. When
        ' the data is out of range for the type, the appropriate
        ' MinValue or MaxValue is used.
        Public Function GetTypeCode( ) As TypeCode _
            Implements IConvertible.GetTypeCode
            Return TypeCode.Object
        End Function

        Function ToBoolean( ByVal provider As IFormatProvider ) As _
            Boolean Implements IConvertible.ToBoolean

            ' ToBoolean is false if the dataset is empty.
            If data.Count <= 0 Then
                Return False

            ' For median averaging, ToBoolean is true if any 
            ' non-discarded elements are nonzero.
            ElseIf AverageType.Median = _
                GetAverageInfo( provider ).TypeOfAverage Then

                If data.Count Mod 2 = 0 Then
                    Return ( data( data.Count \ 2 ) <> 0.0 Or _
                        data( data.Count \ 2 - 1 ) <> 0.0 )
                Else
                    Return data( data.Count \ 2 ) <> 0.0
                End If

            ' For arithmetic or geometric mean averaging, ToBoolean is 
            ' true if any element of the dataset is nonzero.  
            Else
                Dim Index As Integer
                For Index = 0 To data.Count - 1
                    If data( Index ) <> 0.0 Then Return True
                Next Index
                Return False
            End If
        End Function

        Function ToByte( ByVal provider As IFormatProvider ) As Byte _
            Implements IConvertible.ToByte
            Return Convert.ToByte( CalcNLimitAverage( _
                Byte.MinValue, Byte.MaxValue, provider ) )
        End Function

        Function ToChar( ByVal provider As IFormatProvider ) As Char _
            Implements IConvertible.ToChar
            Return Convert.ToChar( Convert.ToUInt16( _
                CalcNLimitAverage( 0.0, &HFFFF, provider ) ) )
        End Function

        ' Convert to DateTime by adding the calculated average as 
        ' seconds to the current date and time. A valid DateTime is 
        ' always returned.
        Function ToDateTime( ByVal provider As IFormatProvider ) As _
            DateTime Implements IConvertible.ToDateTime
            Dim seconds As Double = Average( _
                GetAverageInfo( provider ).TypeOfAverage )
            Try
                Return DateTime.Now.AddSeconds( seconds )
            Catch ex As ArgumentOutOfRangeException 
                Return IIf( seconds < 0.0, DateTime.MinValue, _
                    DateTime.MaxValue )
            End Try
        End Function

        Function ToDecimal( ByVal provider As IFormatProvider ) As _
            Decimal Implements IConvertible.ToDecimal

            ' The Double conversion rounds Decimal.MinValue and
            ' Decimal.MaxValue to invalid Decimal values, so the 
            ' following limits must be used.
            Return Convert.ToDecimal( CalcNLimitAverage( _
                -79228162514264330000000000000.0, _
                79228162514264330000000000000.0, provider ) )
        End Function

        Function ToDouble( ByVal provider As IFormatProvider) As _
            Double Implements IConvertible.ToDouble
            Return Average( GetAverageInfo( provider ).TypeOfAverage )
        End Function

        Function ToInt16( ByVal provider As IFormatProvider ) As _
            Short Implements IConvertible.ToInt16
            Return Convert.ToInt16( CalcNLimitAverage( _
                Int16.MinValue, Int16.MaxValue, provider ) )
        End Function

        Function ToInt32( ByVal provider As IFormatProvider ) As _
            Integer Implements IConvertible.ToInt32
            Return Convert.ToInt32( CalcNLimitAverage( _
                Int32.MinValue, Int32.MaxValue, provider ) )
        End Function

        Function ToInt64( ByVal provider As IFormatProvider ) As Long _
            Implements IConvertible.ToInt64

            ' The Double conversion rounds Int64.MinValue and 
            ' Int64.MaxValue to invalid Long values, so the following 
            ' limits must be used.
            Return Convert.ToInt64( CalcNLimitAverage( _
                -9223372036854775000, 9223372036854775000, provider ) )
        End Function

        Function ToSByte( ByVal provider As IFormatProvider ) As _
            SByte Implements IConvertible.ToSByte

            ' SByte.MinValue and SByte.MaxValue are not defined in
            ' Visual Basic.
            Return Convert.ToSByte( CalcNLimitAverage( _
                -128, 127, provider ) )
        End Function

        Function ToSingle( ByVal provider As IFormatProvider ) As _
            Single Implements IConvertible.ToSingle
            Return Convert.ToSingle( CalcNLimitAverage( _
                Single.MinValue, Single.MaxValue, provider ) )
        End Function

        Function ToUInt16( ByVal provider As IFormatProvider ) As _
            UInt16 Implements IConvertible.ToUInt16

            ' UInt16.MinValue and UInt16.MaxValue are not defined in 
            ' Visual Basic.
            Return Convert.ToUInt16( CalcNLimitAverage( _
                0, &HFFFF, provider ) )
        End Function

        Function ToUInt32( ByVal provider As IFormatProvider ) As _
            UInt32 Implements IConvertible.ToUInt32

            ' UInt32.MinValue and UInt32.MaxValue are not defined in 
            ' Visual Basic.
            Return Convert.ToUInt32( CalcNLimitAverage( _
                0, 4294967295, provider ) )
        End Function

        Function ToUInt64( ByVal provider As IFormatProvider ) As _
            UInt64 Implements IConvertible.ToUInt64

            ' UInt64.MinValue and UInt64.MaxValue are not defined in 
            ' Visual Basic. The Double conversion would have rounded 
            ' UInt64.MaxValue, so the following limit must be used.
            Return Convert.ToUInt64( CalcNLimitAverage( _
                0, 18446744073709550000.0, provider ) )
        End Function

        Function ToType( ByVal conversionType As Type, _
            ByVal provider As IFormatProvider) As Object _
            Implements IConvertible.ToType
            Return Convert.ChangeType( Average( GetAverageInfo( _
                provider ).TypeOfAverage ), conversionType )
        End Function

        Overloads Function ToString( ByVal provider As IFormatProvider _
            ) As String Implements IConvertible.ToString
            Dim avgType as AverageType = _
                GetAverageInfo( provider ).TypeOfAverage
            Return String.Format( "( {0}: {1:G10} )", avgType, _
                Average( avgType ) )
        End Function
    End Class
   
    ' Display a DataSet with three different format providers.
    Sub DisplayDataSet( ds As DataSet )

        Dim fmt    As String      = "{0,-12}{1,20}{2,20}{3,20}"
        Dim median As AverageInfo = New AverageInfo( AverageType.Median )
        Dim geMean As AverageInfo = _
            New AverageInfo( AverageType.GeometricMean )
        Dim iX     As Integer

        ' Display the dataset elements.
        If ds.Count > 0 Then
            Console.Write( vbCrLf & "DataSet: [{0}", ds( 0 ) )
            For iX = 1 To ds.Count - 1
                Console.Write( ", {0}", ds( iX ) )
            Next iX
            Console.WriteLine( "]" & vbCrLf )
        End If

        Console.WriteLine( fmt, "Convert.", "Default", _
            "Geometric Mean", "Median" )
        Console.WriteLine( fmt, "--------", "-------", _
            "--------------", "------" )
        Console.WriteLine( fmt, "ToBoolean", _
            Convert.ToBoolean( ds, Nothing ), _
            Convert.ToBoolean( ds, geMean ), _
            Convert.ToBoolean( ds, median ) )
        Console.WriteLine( fmt, "ToByte", _
            Convert.ToByte( ds, Nothing ), _
            Convert.ToByte( ds, geMean ), _
            Convert.ToByte( ds, median ) )
        Console.WriteLine( fmt, "ToChar", _
            Convert.ToChar( ds, Nothing ), _
            Convert.ToChar( ds, geMean ), _
            Convert.ToChar( ds, median ) )
        Console.WriteLine( "{0,-12}{1,20:yyyy-MM-dd HH:mm:ss}" & _
            "{2,20:yyyy-MM-dd HH:mm:ss}{3,20:yyyy-MM-dd HH:mm:ss}", _
            "ToDateTime", Convert.ToDateTime( ds, Nothing ), _
            Convert.ToDateTime( ds, geMean ), _
            Convert.ToDateTime( ds, median ) )
        Console.WriteLine( fmt, "ToDecimal", _
            Convert.ToDecimal( ds, Nothing ), _
            Convert.ToDecimal( ds, geMean ), _
            Convert.ToDecimal( ds, median ) )
        Console.WriteLine( fmt, "ToDouble", _
            Convert.ToDouble( ds, Nothing ), _
            Convert.ToDouble( ds, geMean ), _
            Convert.ToDouble( ds, median ) )
        Console.WriteLine( fmt, "ToInt16", _
            Convert.ToInt16( ds, Nothing ), _
            Convert.ToInt16( ds, geMean ), _
            Convert.ToInt16( ds, median ) )
        Console.WriteLine( fmt, "ToInt32", _
            Convert.ToInt32( ds, Nothing ), _
            Convert.ToInt32( ds, geMean ), _
            Convert.ToInt32( ds, median ) )
        Console.WriteLine( fmt, "ToInt64", _
            Convert.ToInt64( ds, Nothing ), _
            Convert.ToInt64( ds, geMean ), _
            Convert.ToInt64( ds, median ) )
        Console.WriteLine( fmt, "ToSByte", _
            Convert.ToSByte( ds, Nothing ), _
            Convert.ToSByte( ds, geMean ), _
            Convert.ToSByte( ds, median ) )
        Console.WriteLine( fmt, "ToSingle", _
            Convert.ToSingle( ds, Nothing ), _
            Convert.ToSingle( ds, geMean ), _
            Convert.ToSingle( ds, median ) )
        Console.WriteLine( fmt, "ToUInt16", _
            Convert.ToUInt16( ds, Nothing ), _
            Convert.ToUInt16( ds, geMean ), _
            Convert.ToUInt16( ds, median ) )
        Console.WriteLine( fmt, "ToUInt32", _
            Convert.ToUInt32( ds, Nothing ), _
            Convert.ToUInt32( ds, geMean ), _
            Convert.ToUInt32( ds, median ) )
        Console.WriteLine( fmt, "ToUInt64", _
            Convert.ToUInt64( ds, Nothing ), _
            Convert.ToUInt64( ds, geMean ), _
            Convert.ToUInt64( ds, median ) )
    End Sub
   
    Sub Main( )
        Console.WriteLine( _
            "This example of the Convert.To<Type>( Object, " & _
            "IFormatProvider ) methods " & vbCrLf & "generates " & _
            "the following output. The example displays the " & _
            "values " & vbCrLf & "returned by the methods, " & _
            "using several IFormatProvider objects." & vbCrLf )
          
        Dim ds1 As New DataSet( 10.5, 22.2, 45.9, 88.7, 156.05, 297.6 )
        DisplayDataSet( ds1 )
          
        Dim ds2 As New DataSet( _
            359999.95, 425000, 499999.5, 775000, 1695000 )
        DisplayDataSet( ds2 )
    End Sub 
End Module 

' This example of the Convert.To<Type>( Object, IFormatProvider ) methods
' generates the following output. The example displays the values
' returned by the methods, using several IFormatProvider objects.
' 
' DataSet: [10.5, 22.2, 45.9, 88.7, 156.05, 297.6]
' 
' Convert.                 Default      Geometric Mean              Median
' --------                 -------      --------------              ------
' ToBoolean                   True                True                True
' ToByte                       103                  59                  67
' ToChar                         g                   ;                   C
' ToDateTime   2003-05-13 14:52:53 2003-05-13 14:52:09 2003-05-13 14:52:17
' ToDecimal       103.491666666667    59.4332135445164                67.3
' ToDouble        103.491666666667    59.4332135445164                67.3
' ToInt16                      103                  59                  67
' ToInt32                      103                  59                  67
' ToInt64                      103                  59                  67
' ToSByte                      103                  59                  67
' ToSingle                103.4917            59.43321                67.3
' ToUInt16                     103                  59                  67
' ToUInt32                     103                  59                  67
' ToUInt64                     103                  59                  67
' 
' DataSet: [359999.95, 425000, 499999.5, 775000, 1695000]
' 
' Convert.                 Default      Geometric Mean              Median
' --------                 -------      --------------              ------
' ToBoolean                   True                True                True
' ToByte                       255                 255                 255
' ToChar                         ?                   ?                   ?
' ToDateTime   2003-05-22 07:27:49 2003-05-20 22:17:27 2003-05-19 09:44:29
' ToDecimal              750999.89    631577.237188435            499999.5
' ToDouble               750999.89    631577.237188435            499999.5
' ToInt16                    32767               32767               32767
' ToInt32                   751000              631577              500000
' ToInt64                   751000              631577              500000
' ToSByte                      127                 127                 127
' ToSingle                750999.9            631577.3            499999.5
' ToUInt16                   65535               65535               65535
' ToUInt32                  751000              631577              500000
' ToUInt64                  751000              631577              500000

Comentarios

El valor devuelto es el resultado de invocar IConvertible.ToInt32 el método del tipo subyacente de value.The return value is the result of invoking the IConvertible.ToInt32 method of the underlying type of value.

providerpermite al usuario especificar la información de conversión específica de la referencia cultural sobre valueel contenido de.provider enables the user to specify culture-specific conversion information about the contents of value. Por ejemplo, si value es un String que representa un número, provider podría proporcionar información específica de la referencia cultural acerca de la notación utilizada para representar ese número.For example, if value is a String that represents a number, provider could supply culture-specific information about the notation used to represent that number.

Los tipos base omiten provider; sin embargo, el parámetro se puede utilizar si value es un tipo definido por el usuario que IConvertible implementa la interfaz.The base types ignore provider; however, the parameter may be used if value is a user-defined type that implements the IConvertible interface.

ToInt32(String, IFormatProvider) ToInt32(String, IFormatProvider) ToInt32(String, IFormatProvider) ToInt32(String, IFormatProvider)

Convierte la representación de cadena especificada de un número en un entero de 32 bits con signo equivalente, usando la información de formato específica de la referencia cultural indicada.Converts the specified string representation of a number to an equivalent 32-bit signed integer, using the specified culture-specific formatting information.

public:
 static int ToInt32(System::String ^ value, IFormatProvider ^ provider);
public static int ToInt32 (string value, IFormatProvider provider);
static member ToInt32 : string * IFormatProvider -> int
Public Shared Function ToInt32 (value As String, provider As IFormatProvider) As Integer

Parámetros

value
String String String String

Cadena que contiene el número que se va a convertir.A string that contains the number to convert.

provider
IFormatProvider IFormatProvider IFormatProvider IFormatProvider

Objeto que proporciona información de formato específica de la referencia cultural.An object that supplies culture-specific formatting information.

Devoluciones

Un entero de 32 bits con signo equivalente al número de value, o 0 (cero) si value es null.A 32-bit signed integer that is equivalent to the number in value, or 0 (zero) if value is null.

Excepciones

value no está formado por un signo opcional seguido de una secuencia de dígitos (de 0 a 9).value does not consist of an optional sign followed by a sequence of digits (0 through 9).

value representa un número menor que MinValue o mayor que MaxValue.value represents a number that is less than MinValue or greater than MaxValue.

Ejemplos

En el ejemplo siguiente se define NumberFormatInfo un objeto personalizado que reconoce la cadena "pos" como signo positivo y la cadena "NEG" como signo negativo.The following example defines a custom NumberFormatInfo object that recognizes the string "pos" as the positive sign and the string "neg" as the negative sign. A continuación, intenta convertir cada elemento de una matriz de cadenas numérica en un entero utilizando este proveedor y el NumberFormatInfo proveedor para la referencia cultural de todos los idiomas.It then attempts to convert each element of a numeric string array to an integer using both this provider and the NumberFormatInfo provider for the invariant culture.

using System;
using System.Globalization;

public class Example
{
   public static void Main()
   {
      // Create a custom NumberFormatInfo object and set its two properties
      // used by default in parsing numeric strings.
      NumberFormatInfo customProvider = new NumberFormatInfo();
      customProvider.NegativeSign = "neg ";
      customProvider.PositiveSign = "pos ";

      // Add custom and invariant provider to an array of providers.
      NumberFormatInfo[] providers = { customProvider, NumberFormatInfo.InvariantInfo };
      
      // Define an array of strings to convert.
      string[] numericStrings = { "123456789", "+123456789", "pos 123456789",
                                  "-123456789", "neg 123456789", "123456789.",
                                  "123,456,789", "(123456789)", "2147483648",
                                  "-2147483649" }; 
      
      // Use each provider to parse all the numeric strings.
      for (int ctr = 0; ctr <= 1; ctr++)
      {
         IFormatProvider provider = providers[ctr];
         Console.WriteLine(ctr == 0 ? "Custom Provider:" : "Invariant Provider:");
         foreach (string numericString in numericStrings)
         {
            Console.Write("{0,15}  --> ", numericString);
            try {
               Console.WriteLine("{0,20}", Convert.ToInt32(numericString, provider));
            }
            catch (FormatException) {
               Console.WriteLine("{0,20}", "FormatException");
            }    
            catch (OverflowException) {
               Console.WriteLine("{0,20}", "OverflowException");                 
            }
         }
         Console.WriteLine();
      }                  
   }
}
// The example displays the following output:
//       Custom Provider:
//             123456789  -->            123456789
//            +123456789  -->      FormatException
//         pos 123456789  -->            123456789
//            -123456789  -->      FormatException
//         neg 123456789  -->           -123456789
//            123456789.  -->      FormatException
//           123,456,789  -->      FormatException
//           (123456789)  -->      FormatException
//            2147483648  -->    OverflowException
//           -2147483649  -->      FormatException
//       
//       Invariant Provider:
//             123456789  -->            123456789
//            +123456789  -->            123456789
//         pos 123456789  -->      FormatException
//            -123456789  -->           -123456789
//         neg 123456789  -->      FormatException
//            123456789.  -->      FormatException
//           123,456,789  -->      FormatException
//           (123456789)  -->      FormatException
//            2147483648  -->    OverflowException
//           -2147483649  -->    OverflowException
Imports System.Globalization

Module Example
   Public Sub Main()
      ' Create a custom NumberFormatInfo object and set its two properties
      ' used by default in parsing numeric strings.
      Dim customProvider As New NumberFormatInfo()
      customProvider.NegativeSign = "neg "
      customProvider.PositiveSign = "pos "

      ' Add custom and invariant provider to an array of providers.
      Dim providers() As NumberFormatInfo = { customProvider, NumberFormatInfo.InvariantInfo }
      
      ' Define an array of strings to convert.
      Dim numericStrings() As String = { "123456789", "+123456789", "pos 123456789", _
                                         "-123456789", "neg 123456789", "123456789.", _
                                         "123,456,789", "(123456789)", "2147483648", _
                                         "-2147483649" } 
      
      ' Use each provider to parse all the numeric strings.
      For ctr As Integer = 0 To 1
         Dim provider As IFormatPRovider = providers(ctr)
         Console.WriteLine(IIf(ctr = 0, "Custom Provider:", "Invariant Provider:"))
         For Each numericString As String In numericStrings
            Console.Write("{0,15}  --> ", numericString)
            Try
               Console.WriteLine("{0,20}", Convert.ToInt32(numericString, provider))
            Catch e As FormatException
               Console.WriteLine("{0,20}", "FormatException") 
            Catch e As OverflowException
               Console.WriteLine("{0,20}", "OverflowException")                 
            End Try
         Next
         Console.WriteLine()
      Next                  
   End Sub 
End Module 
' The example displays the following output:
'       Custom Provider:
'             123456789  -->            123456789
'            +123456789  -->      FormatException
'         pos 123456789  -->            123456789
'            -123456789  -->      FormatException
'         neg 123456789  -->           -123456789
'            123456789.  -->      FormatException
'           123,456,789  -->      FormatException
'           (123456789)  -->      FormatException
'            2147483648  -->    OverflowException
'           -2147483649  -->      FormatException
'       
'       Invariant Provider:
'             123456789  -->            123456789
'            +123456789  -->            123456789
'         pos 123456789  -->      FormatException
'            -123456789  -->           -123456789
'         neg 123456789  -->      FormatException
'            123456789.  -->      FormatException
'           123,456,789  -->      FormatException
'           (123456789)  -->      FormatException
'            2147483648  -->    OverflowException
'           -2147483649  -->    OverflowException

Comentarios

El valor devuelto es el resultado de invocar Int32.Parse el método valueen.The return value is the result of invoking the Int32.Parse method on value.

provideres una IFormatProvider instancia de que obtiene un NumberFormatInfo objeto.provider is an IFormatProvider instance that obtains a NumberFormatInfo object. El NumberFormatInfo objeto proporciona información específica de la referencia cultural acerca del valueformato de.The NumberFormatInfo object provides culture-specific information about the format of value. Si provider es null ,NumberFormatInfo se utiliza para la referencia cultural actual.If provider is null, the NumberFormatInfo for the current culture is used.

Si prefiere no controlar una excepción si se produce un error en la conversión, puede llamar Int32.TryParse al método en su lugar.If you prefer not to handle an exception if the conversion fails, you can call the Int32.TryParse method instead. Devuelve un Boolean valor que indica si la conversión se realizó correctamente o no.It returns a Boolean value that indicates whether the conversion succeeded or failed.

ToInt32(String, Int32) ToInt32(String, Int32) ToInt32(String, Int32) ToInt32(String, Int32)

Convierte la representación de cadena de un número en una base especificada en un entero de 32 bits con signo equivalente.Converts the string representation of a number in a specified base to an equivalent 32-bit signed integer.

public:
 static int ToInt32(System::String ^ value, int fromBase);
public static int ToInt32 (string value, int fromBase);
static member ToInt32 : string * int -> int
Public Shared Function ToInt32 (value As String, fromBase As Integer) As Integer

Parámetros

value
String String String String

Cadena que contiene el número que se va a convertir.A string that contains the number to convert.

fromBase
Int32 Int32 Int32 Int32

Base del número de value, que debe ser 2, 8, 10 o 16.The base of the number in value, which must be 2, 8, 10, or 16.

Devoluciones

Un entero de 32 bits con signo equivalente al número de value, o 0 (cero) si value es null.A 32-bit signed integer that is equivalent to the number in value, or 0 (zero) if value is null.

Excepciones

fromBase no es 2, 8, 10 o 16.fromBase is not 2, 8, 10, or 16.

O bien-or- value, que representa un número con signo que no sea de base 10, tiene un signo negativo como prefijo.value, which represents a non-base 10 signed number, is prefixed with a negative sign.

value contiene un carácter que no es un dígito válido en la base especificada por fromBase.value contains a character that is not a valid digit in the base specified by fromBase. El mensaje de excepción indica que no hay dígitos para convertir si el primer carácter de value no es válido; en caso contrario, el mensaje indica que value contiene caracteres finales no válidos.The exception message indicates that there are no digits to convert if the first character in value is invalid; otherwise, the message indicates that value contains invalid trailing characters.

value, que representa un número con signo que no sea de base 10, tiene un signo negativo como prefijo.value, which represents a non-base 10 signed number, is prefixed with a negative sign.

O bien-or- value representa un número menor que MinValue o mayor que MaxValue.value represents a number that is less than MinValue or greater than MaxValue.

Comentarios

Si fromBase es 16, puede anteponer "0x" o " value 0x" al número especificado por el parámetro.If fromBase is 16, you can prefix the number specified by the value parameter with "0x" or "0X".

Dado que el signo negativo no se admite para representaciones numéricas que no son de ToInt32(String, Int32) base 10, el método supone que los números negativos usan la representación del complemento de dos.Because the negative sign is not supported for non-base 10 numeric representations, the ToInt32(String, Int32) method assumes that negative numbers use two's complement representation. En otras palabras, el método siempre interpreta el bit binario de orden superior de un entero (bit 31) como su bit de signo.In other words, the method always interprets the highest-order binary bit of an integer (bit 31) as its sign bit. Como resultado, es posible escribir código en el que un número que no sea de base 10 que esté fuera del intervalo del tipo de Int32 datos se convierte en un Int32 valor sin que el método inicie una excepción.As a result, it is possible to write code in which a non-base 10 number that is out of the range of the Int32 data type is converted to an Int32 value without the method throwing an exception. Int32.MaxValue En el ejemplo siguiente se incrementa en uno, se convierte el número resultante en su representación de cadena hexadecimal y, a ToInt32(String, Int32) continuación, se llama al método.The following example increments Int32.MaxValue by one, converts the resulting number to its hexadecimal string representation, and then calls the ToInt32(String, Int32) method. En lugar de producir una excepción, el método muestra el mensaje "0x80000000 se convierte en-2147483648".Instead of throwing an exception, the method displays the message, "0x80000000 converts to -2147483648."

// Create a hexadecimal value out of range of the integer type. 
String^ value1 = Convert::ToString((static_cast<__int64>(int::MaxValue)) + 1, 16);
// Convert it back to a number.
try {
   int number = Convert::ToInt32(value1, 16);
   Console::WriteLine("0x{0} converts to {1}.", value1, number);
}
catch (OverflowException ^e) {
   Console::WriteLine("Unable to convert '0x{0}' to an integer.", value1);
}
// The example displays the following output:
//      0x80000000 converts to -2147483648.
// Create a hexadecimal value out of range of the Integer type.
string value = Convert.ToString((long) int.MaxValue + 1, 16);
// Convert it back to a number.
try
{
   int number = Convert.ToInt32(value, 16);
   Console.WriteLine("0x{0} converts to {1}.", value, number.ToString());
}
catch (OverflowException)
{
   Console.WriteLine("Unable to convert '0x{0}' to an integer.", value);
}   
' Create a hexadecimal value out of range of the Integer type.
Dim value As String = Convert.ToString(CLng(Integer.MaxValue) + 1, 16)
' Convert it back to a number.
Try
   Dim number As Integer = Convert.ToInt32(value, 16)
   Console.WriteLine("0x{0} converts to {1}.", value, number)
Catch e As OverflowException
   Console.WriteLine("Unable to convert '0x{0}' to an integer.", value)
End Try   

Al realizar operaciones binarias o Conversiones numéricas, siempre es responsabilidad del desarrollador comprobar que un método usa la representación numérica adecuada para interpretar un valor determinado.When performing binary operations or numeric conversions, it is always the responsibility of the developer to verify that a method is using the appropriate numeric representation to interpret a particular value. Como se muestra en el ejemplo siguiente, puede asegurarse de que el método controla los desbordamientos correctamente recuperando primero el signo del valor numérico antes de convertirlo en su representación de cadena hexadecimal.As the following example illustrates, you can ensure that the method handles overflows appropriately by first retrieving the sign of the numeric value before converting it to its hexadecimal string representation. Produce una excepción si el valor original era positivo pero la conversión de nuevo a un entero produce un valor negativo.Throw an exception if the original value was positive but the conversion back to an integer yields a negative value.

__int64 sourceNumber2 = (static_cast<__int64>(int::MaxValue)) + 1;
bool isNegative = Math::Sign(sourceNumber2) == -1;
String^ value2 = Convert::ToString(sourceNumber2, 16);
int targetNumber;
try {
   targetNumber = Convert::ToInt32(value2, 16);
   if (!(isNegative) & (targetNumber & 0x80000000) != 0)
      throw gcnew OverflowException();
   else
      Console::WriteLine("0x{0} converts to {1}.", value2, targetNumber);
}
catch (OverflowException ^e) {
   Console::WriteLine("Unable to convert '0x{0}' to an integer.", value2);
}
// The example displays the following output:
//       Unable to convert '0x80000000' to an integer.
// Create a hexadecimal value out of range of the Integer type.
long sourceNumber = (long) int.MaxValue + 1;
bool isNegative = Math.Sign(sourceNumber) == -1;
string value = Convert.ToString(sourceNumber, 16);
int targetNumber;
try
{
   targetNumber = Convert.ToInt32(value, 16);
   if (!(isNegative) & (targetNumber & 0x80000000) != 0) 
      throw new OverflowException();
   else 
      Console.WriteLine("0x{0} converts to {1}.", value, targetNumber);
}
catch (OverflowException)
{
   Console.WriteLine("Unable to convert '0x{0}' to an integer.", value);
} 
// Displays the following to the console:
//    Unable to convert '0x80000000' to an integer.    
' Create a hexadecimal value out of range of the Integer type.
Dim sourceNumber As Long = CLng(Integer.MaxValue) + 1
Dim isNegative As Boolean = (Math.Sign(sourceNumber) = -1)
Dim value As String = Convert.ToString(sourceNumber, 16)
Dim targetNumber As Integer
Try
   targetNumber = Convert.ToInt32(value, 16)
   If Not isNegative And ((targetNumber And &H80000000) <> 0) Then
      Throw New OverflowException()
   Else 
      Console.WriteLine("0x{0} converts to {1}.", value, targetNumber)
   End If    
Catch e As OverflowException
   Console.WriteLine("Unable to convert '0x{0}' to an integer.", value)
End Try 
' Displays the following to the console:
'    Unable to convert '0x80000000' to an integer.     

ToInt32(UInt64) ToInt32(UInt64) ToInt32(UInt64) ToInt32(UInt64)

Importante

Esta API no es conforme a CLS.

Convierte el valor del entero de 64 bits sin signo especificado en un entero de 32 bits con signo equivalente.Converts the value of the specified 64-bit unsigned integer to an equivalent 32-bit signed integer.

public:
 static int ToInt32(System::UInt64 value);
[System.CLSCompliant(false)]
public static int ToInt32 (ulong value);
static member ToInt32 : uint64 -> int
Public Shared Function ToInt32 (value As ULong) As Integer

Parámetros

value
UInt64 UInt64 UInt64 UInt64

Entero de 64 bits sin signo que se va a convertir.The 64-bit unsigned integer to convert.

Devoluciones

Un entero de 32 bits con signo equivalente a value.A 32-bit signed integer that is equivalent to value.

Excepciones

Ejemplos

En el ejemplo siguiente se intenta convertir cada elemento de una matriz de enteros largos sin signo en un entero con signo.The following example attempts to convert each element in an array of unsigned long integers to a signed integer.

ulong[] numbers = { UInt64.MinValue, 121, 340, UInt64.MaxValue };
int result;
foreach (ulong number in numbers)
{
   try {
      result = Convert.ToInt32(number);
      Console.WriteLine("Converted the {0} value {1} to a {2} value {3}.",
                        number.GetType().Name, number,
                        result.GetType().Name, result);
   }
   catch (OverflowException) {
      Console.WriteLine("The {0} value {1} is outside the range of the Int32 type.",
                        number.GetType().Name, number);
   }
}
// The example displays the following output:
//    Converted the UInt64 value 0 to a Int32 value 0.
//    Converted the UInt64 value 121 to a Int32 value 121.
//    Converted the UInt64 value 340 to a Int32 value 340.
//    The UInt64 value 18446744073709551615 is outside the range of the Int32 type.
Dim numbers() As ULong = { UInt64.MinValue, 121, 340, UInt64.MaxValue }
Dim result As Integer
For Each number As ULong In numbers
   Try
      result = Convert.ToInt32(number)
      Console.WriteLine("Converted the {0} value {1} to a {2} value {3}.", _
                        number.GetType().Name, number, _
                        result.GetType().Name, result)
   Catch e As OverflowException
      Console.WriteLine("The {0} value {1} is outside the range of the Int32 type.", _
                        number.GetType().Name, number)
   End Try
Next
' The example displays the following output:
'    Converted the UInt64 value 0 to a Int32 value 0.
'    Converted the UInt64 value 121 to a Int32 value 121.
'    Converted the UInt64 value 340 to a Int32 value 340.
'    The UInt64 value 18446744073709551615 is outside the range of the Int32 type.

ToInt32(Object) ToInt32(Object) ToInt32(Object) ToInt32(Object)

Convierte el valor del objeto especificado en un entero de 32 bits con signo.Converts the value of the specified object to a 32-bit signed integer.

public:
 static int ToInt32(System::Object ^ value);
public static int ToInt32 (object value);
static member ToInt32 : obj -> int
Public Shared Function ToInt32 (value As Object) As Integer

Parámetros

value
Object Object Object Object

Objeto que implementa la interfaz IConvertible o null.An object that implements the IConvertible interface, or null.

Devoluciones

Un entero de 32 bits con signo equivalente a value, o cero si value es null.A 32-bit signed integer equivalent to value, or zero if value is null.

Excepciones

value no tiene un formato adecuado.value is not in an appropriate format.

value no implementa la interfaz IConvertible.value does not implement the IConvertible interface.

o bien-or- No se admite la conversión.The conversion is not supported.

value representa un número menor que MinValue o mayor que MaxValue.value represents a number that is less than MinValue or greater than MaxValue.

Ejemplos

En el ejemplo siguiente se intenta convertir cada elemento de una matriz de objetos en un entero.The following example attempts to convert each element in an object array to an integer.

object[] values = { true, -12, 163, 935, 'x', new DateTime(2009, 5, 12),
                    "104", "103.0", "-1",
                    "1.00e2", "One", 1.00e2, 16.3e42};
int result;

foreach (object value in values)
{
   try {
      result = Convert.ToInt32(value);
      Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.",
                        value.GetType().Name, value,
                        result.GetType().Name, result);
   }
   catch (OverflowException) {
      Console.WriteLine("The {0} value {1} is outside the range of the Int32 type.",
                        value.GetType().Name, value);
   }                     
   catch (FormatException) {
      Console.WriteLine("The {0} value {1} is not in a recognizable format.",
                        value.GetType().Name, value);
   }
   catch (InvalidCastException) {
      Console.WriteLine("No conversion to an Int32 exists for the {0} value {1}.",
                        value.GetType().Name, value);
                        
   }
}                           
// The example displays the following output:
//    Converted the Boolean value True to the Int32 value 1.
//    Converted the Int32 value -12 to the Int32 value -12.
//    Converted the Int32 value 163 to the Int32 value 163.
//    Converted the Int32 value 935 to the Int32 value 935.
//    Converted the Char value x to the Int32 value 120.
//    No conversion to an Int32 exists for the DateTime value 5/12/2009 12:00:00 AM.
//    Converted the String value 104 to the Int32 value 104.
//    The String value 103.0 is not in a recognizable format.
//    Converted the String value -1 to the Int32 value -1.
//    The String value 1.00e2 is not in a recognizable format.
//    The String value One is not in a recognizable format.
//    Converted the Double value 100 to the Int32 value 100.
//    The Double value 1.63E+43 is outside the range of the Int32 type.
Dim values() As Object = { True, -12, 163, 935, "x"c, #5/12/2009#, _
                           "104", "103.0", "-1", _
                           "1.00e2", "One", 1.00e2, 16.3e42}
Dim result As Integer

For Each value As Object In values
   Try
      result = Convert.ToInt32(value)
      Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.", _
                        value.GetType().Name, value, _
                        result.GetType().Name, result)
   Catch e As OverflowException
      Console.WriteLine("The {0} value {1} is outside the range of the Int32 type.", _
                        value.GetType().Name, value)
   Catch e As FormatException
      Console.WriteLine("The {0} value {1} is not in a recognizable format.", _
                        value.GetType().Name, value)
   Catch e As InvalidCastException
      Console.WriteLine("No conversion to an Int32 exists for the {0} value {1}.", _
                        value.GetType().Name, value)
                        
   End Try
Next                           
' The example displays the following output:
'    Converted the Boolean value True to the Int32 value 1.
'    Converted the Int32 value -12 to the Int32 value -12.
'    Converted the Int32 value 163 to the Int32 value 163.
'    Converted the Int32 value 935 to the Int32 value 935.
'    Converted the Char value x to the Int32 value 120.
'    No conversion to an Int32 exists for the DateTime value 5/12/2009 12:00:00 AM.
'    Converted the String value 104 to the Int32 value 104.
'    The String value 103.0 is not in a recognizable format.
'    Converted the String value -1 to the Int32 value -1.
'    The String value 1.00e2 is not in a recognizable format.
'    The String value One is not in a recognizable format.
'    Converted the Double value 100 to the Int32 value 100.
'    The Double value 1.63E+43 is outside the range of the Int32 type.

Comentarios

Sivalue IConvertible.ToInt32 valueno nulles, este método encapsula una llamada a la implementación del tipo subyacente de.Ifvalue is not null, this method wraps a call to the IConvertible.ToInt32 implementation of the underlying type of value.

ToInt32(UInt16) ToInt32(UInt16) ToInt32(UInt16) ToInt32(UInt16)

Importante

Esta API no es conforme a CLS.

Convierte el valor del entero de 16 bits sin signo especificado en un entero de 32 bits con signo equivalente.Converts the value of the specified 16-bit unsigned integer to the equivalent 32-bit signed integer.

public:
 static int ToInt32(System::UInt16 value);
[System.CLSCompliant(false)]
public static int ToInt32 (ushort value);
static member ToInt32 : uint16 -> int
Public Shared Function ToInt32 (value As UShort) As Integer

Parámetros

value
UInt16 UInt16 UInt16 UInt16

Entero de 16 bits sin signo que se va a convertir.The 16-bit unsigned integer to convert.

Devoluciones

Un entero de 32 bits con signo equivalente a value.A 32-bit signed integer that is equivalent to value.

Ejemplos

En el siguiente ejemplo se convierte cada elemento de una matriz de enteros de 16 bits sin signo en un entero.The following example converts each element in an array of 16-bit unsigned integers to an integer.

ushort[] numbers = { UInt16.MinValue, 121, 340, UInt16.MaxValue };
int result;
foreach (ushort number in numbers)
{
   try {
      result = Convert.ToInt32(number);
      Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.",
                        number.GetType().Name, number,
                        result.GetType().Name, result);
   }
   catch (OverflowException) {
      Console.WriteLine("The {0} value {1} is outside the range of the Int32 type.",
                        number.GetType().Name, number);
   }
}
// The example displays the following output:
//    Converted the UInt16 value 0 to the Int32 value 0.
//    Converted the UInt16 value 121 to the Int32 value 121.
//    Converted the UInt16 value 340 to the Int32 value 340.
//    Converted the UInt16 value 65535 to the Int32 value 65535.
Dim numbers() As UShort = { UInt16.MinValue, 121, 340, UInt16.MaxValue }
Dim result As Integer
For Each number As UShort In numbers
   Try
      result = Convert.ToInt32(number)
      Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.", _
                        number.GetType().Name, number, _
                        result.GetType().Name, result)
   Catch e As OverflowException
      Console.WriteLine("The {0} value {1} is outside the range of the Int32 type.", _
                        number.GetType().Name, number)
   End Try
Next
' The example displays the following output:
'    Converted the UInt16 value 0 to the Int32 value 0.
'    Converted the UInt16 value 121 to the Int32 value 121.
'    Converted the UInt16 value 340 to the Int32 value 340.
'    Converted the UInt16 value 65535 to the Int32 value 65535.

ToInt32(Int32) ToInt32(Int32) ToInt32(Int32) ToInt32(Int32)

Devuelve el entero de 32 bits con signo especificado; no se efectúa una conversión real.Returns the specified 32-bit signed integer; no actual conversion is performed.

public:
 static int ToInt32(int value);
public static int ToInt32 (int value);
static member ToInt32 : int -> int
Public Shared Function ToInt32 (value As Integer) As Integer

Parámetros

value
Int32 Int32 Int32 Int32

Entero de 32 bits con signo que se va a devolver.The 32-bit signed integer to return.

Devoluciones

value se devuelve sin cambios.value is returned unchanged.

ToInt32(Byte) ToInt32(Byte) ToInt32(Byte) ToInt32(Byte)

Convierte el valor del entero de 8 bits sin signo especificado en un entero de 32 bits con signo equivalente.Converts the value of the specified 8-bit unsigned integer to the equivalent 32-bit signed integer.

public:
 static int ToInt32(System::Byte value);
public static int ToInt32 (byte value);
static member ToInt32 : byte -> int
Public Shared Function ToInt32 (value As Byte) As Integer

Parámetros

value
Byte Byte Byte Byte

Entero de 8 bits sin signo que se va a convertir.The 8-bit unsigned integer to convert.

Devoluciones

Un entero de 32 bits con signo equivalente a value.A 32-bit signed integer that is equivalent to value.

Ejemplos

En el siguiente ejemplo se convierte cada elemento de una matriz de bytes en un entero.The following example converts each element in an array of bytes to an integer.

byte[] bytes = { Byte.MinValue, 14, 122, Byte.MaxValue};
int result;

foreach (byte byteValue in bytes)
{
   result = Convert.ToInt32(byteValue);
   Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.",
                     byteValue.GetType().Name, byteValue,
                     result.GetType().Name, result);
}
// The example displays the following output:
//       Converted the Byte value 0 to the Int32 value 0.
//       Converted the Byte value 14 to the Int32 value 14.
//       Converted the Byte value 122 to the Int32 value 122.
//       Converted the Byte value 255 to the Int32 value 255.
Dim bytes() As Byte = { Byte.MinValue, 14, 122, Byte.MaxValue}
Dim result As Integer

For Each byteValue As Byte In bytes
   result = Convert.ToInt32(byteValue)
   Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.", _
                     byteValue.GetType().Name, byteValue, _
                     result.GetType().Name, result)
Next
' The example displays the following output:
'       Converted the Byte value 0 to the Int32 value 0.
'       Converted the Byte value 14 to the Int32 value 14.
'       Converted the Byte value 122 to the Int32 value 122.
'       Converted the Byte value 255 to the Int32 value 255.

ToInt32(Char) ToInt32(Char) ToInt32(Char) ToInt32(Char)

Convierte el valor del carácter Unicode especificado en un entero de 32 bits con signo equivalente.Converts the value of the specified Unicode character to the equivalent 32-bit signed integer.

public:
 static int ToInt32(char value);
public static int ToInt32 (char value);
static member ToInt32 : char -> int
Public Shared Function ToInt32 (value As Char) As Integer

Parámetros

value
Char Char Char Char

Carácter Unicode que se va a convertir.The Unicode character to convert.

Devoluciones

Un entero de 32 bits con signo equivalente a value.A 32-bit signed integer that is equivalent to value.

Ejemplos

En el siguiente ejemplo se convierte cada elemento de una matriz Char de valores en un entero.The following example converts each element in an array of Char values to an integer.

char[] chars = { 'a', 'z', '\u0007', '\u03FF',
                 '\u7FFF', '\uFFFE' };
int result;
                        
foreach (char ch in chars)
{
   try {
      result = Convert.ToInt32(ch);
      Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.",
                        ch.GetType().Name, ch,
                        result.GetType().Name, result);
   }
   catch (OverflowException) {
      Console.WriteLine("Unable to convert u+{0} to an Int32.",
                        ((int)ch).ToString("X4"));
   }
}   
// The example displays the following output:
//       Converted the Char value 'a' to the Int32 value 97.
//       Converted the Char value 'z' to the Int32 value 122.
//       Converted the Char value '' to the Int32 value 7.
//       Converted the Char value '?' to the Int32 value 1023.
//       Converted the Char value '?' to the Int32 value 32767.
//       Converted the Char value '?' to the Int32 value 65534.
Dim chars() As Char = { "a"c, "z"c, ChrW(7), ChrW(1023), _
                        ChrW(Short.MaxValue), ChrW(&hFFFE) }
Dim result As Integer
                        
For Each ch As Char in chars
   Try
      result = Convert.ToInt32(ch)
      Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.", _
                        ch.GetType().Name, ch, _
                        result.GetType().Name, result)
   Catch e As OverflowException
      Console.WriteLine("Unable to convert u+{0} to an Int32.", _
                        AscW(ch).ToString("X4"))
   End Try
Next   
' The example displays the following output:
'       Converted the Char value 'a' to the Int32 value 97.
'       Converted the Char value 'z' to the Int32 value 122.
'       Converted the Char value '' to the Int32 value 7.
'       Converted the Char value '?' to the Int32 value 1023.
'       Converted the Char value '?' to the Int32 value 32767.
'       Converted the Char value '?' to the Int32 value 65534.

Comentarios

El ToInt32(Char) método devuelve un entero con signo value de 32 bits que representa la unidad de código codificada en UTF-16 del argumento.The ToInt32(Char) method returns a 32-bit signed integer that represents the UTF-16 encoded code unit of the value argument. Si value no es un suplente bajo o un suplente alto, este valor devuelto también representa el punto de código Unicode.If value is not a low surrogate or a high surrogate, this return value also represents the Unicode code point of value.

ToInt32(DateTime) ToInt32(DateTime) ToInt32(DateTime) ToInt32(DateTime)

Cuando se llama a este método, siempre se produce InvalidCastException.Calling this method always throws InvalidCastException.

public:
 static int ToInt32(DateTime value);
public static int ToInt32 (DateTime value);
static member ToInt32 : DateTime -> int
Public Shared Function ToInt32 (value As DateTime) As Integer

Parámetros

value
DateTime DateTime DateTime DateTime

Valor de fecha y hora que se va a convertir.The date and time value to convert.

Devoluciones

No se admite esta conversión.This conversion is not supported. No se devuelve ningún valor.No value is returned.

Excepciones

No se admite esta conversión.This conversion is not supported.

ToInt32(Boolean) ToInt32(Boolean) ToInt32(Boolean) ToInt32(Boolean)

Convierte el valor booleano especificado en un entero de 32 bits con signo equivalente.Converts the specified Boolean value to the equivalent 32-bit signed integer.

public:
 static int ToInt32(bool value);
public static int ToInt32 (bool value);
static member ToInt32 : bool -> int
Public Shared Function ToInt32 (value As Boolean) As Integer

Parámetros

value
Boolean Boolean Boolean Boolean

Valor booleano que se va a convertir.The Boolean value to convert.

Devoluciones

Número 1 si value es true; en caso contrario, 0.The number 1 if value is true; otherwise, 0.

Ejemplos

En el ejemplo siguiente se convierten true los false Boolean valores y en enteros.The following example converts the Boolean values true and false to integers.

bool falseFlag = false;
bool trueFlag = true;

Console.WriteLine("{0} converts to {1}.", falseFlag,
                  Convert.ToInt32(falseFlag));
Console.WriteLine("{0} converts to {1}.", trueFlag,
                  Convert.ToInt32(trueFlag));
// The example displays the following output:
//       False converts to 0.
//       True converts to 1.
Dim falseFlag As Boolean = False
Dim trueFlag As Boolean = True

Console.WriteLine("{0} converts to {1}.", falseFlag, _
                  Convert.ToInt32(falseFlag))
Console.WriteLine("{0} converts to {1}.", trueFlag, _
                  Convert.ToInt32(trueFlag))
' The example displays the following output:
'       False converts to 0.
'       True converts to 1.

ToInt32(Int64) ToInt32(Int64) ToInt32(Int64) ToInt32(Int64)

Convierte el valor del entero de 64 bits con signo especificado en un entero de 32 bits con signo equivalente.Converts the value of the specified 64-bit signed integer to an equivalent 32-bit signed integer.

public:
 static int ToInt32(long value);
public static int ToInt32 (long value);
static member ToInt32 : int64 -> int
Public Shared Function ToInt32 (value As Long) As Integer

Parámetros

value
Int64 Int64 Int64 Int64

Entero de 64 bits con signo que se va a convertir.The 64-bit signed integer to convert.

Devoluciones

Un entero de 32 bits con signo equivalente a value.A 32-bit signed integer that is equivalent to value.

Excepciones

value es mayor que MaxValue o menor que MinValue.value is greater than MaxValue or less than MinValue.

Ejemplos

En el ejemplo siguiente se intenta convertir cada elemento de una matriz de enteros Long en un entero.The following example attempts to convert each element in an array of long integers to an integer.

long[] numbers = { Int64.MinValue, -1, 0, 121, 340, Int64.MaxValue };
int result;
foreach (long number in numbers)
{
   try {
      result = Convert.ToInt32(number);
      Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.",
                        number.GetType().Name, number,
                        result.GetType().Name, result);
   }
   catch (OverflowException) {
      Console.WriteLine("The {0} value {1} is outside the range of the Int32 type.",
                        number.GetType().Name, number);
   }
}
// The example displays the following output:
//    The Int64 value -9223372036854775808 is outside the range of the Int32 type.
//    Converted the Int64 value -1 to the Int32 value -1.
//    Converted the Int64 value 0 to the Int32 value 0.
//    Converted the Int64 value 121 to the Int32 value 121.
//    Converted the Int64 value 340 to the Int32 value 340.
//    The Int64 value 9223372036854775807 is outside the range of the Int32 type.
Dim numbers() As Long = { Int64.MinValue, -1, 0, 121, 340, Int64.MaxValue }
Dim result As Integer
For Each number As Long In numbers
   Try
      result = Convert.ToInt32(number)
      Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.", _
                        number.GetType().Name, number, _
                        result.GetType().Name, result)
   Catch e As OverflowException
      Console.WriteLine("The {0} value {1} is outside the range of the Int32 type.", _
                        number.GetType().Name, number)
   End Try
Next
' The example displays the following output:
'    The Int64 value -9223372036854775808 is outside the range of the Int32 type.
'    Converted the Int64 value -1 to the Int32 value -1.
'    Converted the Int64 value 0 to the Int32 value 0.
'    Converted the Int64 value 121 to the Int32 value 121.
'    Converted the Int64 value 340 to the Int32 value 340.
'    The Int64 value 9223372036854775807 is outside the range of the Int32 type.

ToInt32(Double) ToInt32(Double) ToInt32(Double) ToInt32(Double)

Convierte el valor del número de punto flotante de precisión doble especificado en un entero de 32 bits con signo equivalente.Converts the value of the specified double-precision floating-point number to an equivalent 32-bit signed integer.

public:
 static int ToInt32(double value);
public static int ToInt32 (double value);
static member ToInt32 : double -> int
Public Shared Function ToInt32 (value As Double) As Integer

Parámetros

value
Double Double Double Double

Número de punto flotante de precisión doble que se va a convertir.The double-precision floating-point number to convert.

Devoluciones

value, redondeado al entero de 32 bits con signo más próximo.value, rounded to the nearest 32-bit signed integer. Si value está en medio de dos números enteros, se devuelve el número par, es decir, 4,5 se convierte en 4 y 5,5 se convierte en 6.If value is halfway between two whole numbers, the even number is returned; that is, 4.5 is converted to 4, and 5.5 is converted to 6.

Excepciones

value es mayor que MaxValue o menor que MinValue.value is greater than MaxValue or less than MinValue.

Ejemplos

En el ejemplo siguiente se intenta convertir cada elemento de una matriz Double de valores en un entero.The following example attempts to convert each element in an array of Double values to an integer.

double[] values= { Double.MinValue, -1.38e10, -1023.299, -12.98,
                   0, 9.113e-16, 103.919, 17834.191, Double.MaxValue };
int result;

foreach (double value in values)
{
   try {
      result = Convert.ToInt32(value);
      Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.",
                        value.GetType().Name, value,
                        result.GetType().Name, result);
   }
   catch (OverflowException) {
      Console.WriteLine("{0} is outside the range of the Int32 type.", value);
   }   
}                                 
//    -1.79769313486232E+308 is outside the range of the Int32 type.
//    -13800000000 is outside the range of the Int32 type.
//    Converted the Double value '-1023.299' to the Int32 value -1023.
//    Converted the Double value '-12.98' to the Int32 value -13.
//    Converted the Double value '0' to the Int32 value 0.
//    Converted the Double value '9.113E-16' to the Int32 value 0.
//    Converted the Double value '103.919' to the Int32 value 104.
//    Converted the Double value '17834.191' to the Int32 value 17834.
//    1.79769313486232E+308 is outside the range of the Int32 type.
Dim values() As Double = { Double.MinValue, -1.38e10, -1023.299, -12.98, _
                           0, 9.113e-16, 103.919, 17834.191, Double.MaxValue }
Dim result As Integer

For Each value As Double In values
   Try
      result = Convert.ToInt32(value)
      Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.", _
                        value.GetType().Name, value, _
                        result.GetType().Name, result)
   Catch e As OverflowException
      Console.WriteLine("{0} is outside the range of the Int32 type.", value)
   End Try   
Next                                 
'    -1.79769313486232E+308 is outside the range of the Int32 type.
'    -13800000000 is outside the range of the Int32 type.
'    Converted the Double value '-1023.299' to the Int32 value -1023.
'    Converted the Double value '-12.98' to the Int32 value -13.
'    Converted the Double value '0' to the Int32 value 0.
'    Converted the Double value '9.113E-16' to the Int32 value 0.
'    Converted the Double value '103.919' to the Int32 value 104.
'    Converted the Double value '17834.191' to the Int32 value 17834.
'    1.79769313486232E+308 is outside the range of the Int32 type.
Consulte también:

ToInt32(Int16) ToInt32(Int16) ToInt32(Int16) ToInt32(Int16)

Convierte el valor del entero de 16 bits con signo especificado en un entero de 32 bits con signo equivalente.Converts the value of the specified 16-bit signed integer to an equivalent 32-bit signed integer.

public:
 static int ToInt32(short value);
public static int ToInt32 (short value);
static member ToInt32 : int16 -> int
Public Shared Function ToInt32 (value As Short) As Integer

Parámetros

value
Int16 Int16 Int16 Int16

Entero de 16 bits con signo que se va a convertir.The 16-bit signed integer to convert.

Devoluciones

Un entero de 32 bits con signo equivalente a value.A 32-bit signed integer that is equivalent to value.

Ejemplos

En el ejemplo siguiente se convierte cada elemento de una matriz de enteros de 16 bits con signo en un entero.The following example converts each element in an array of 16-bit signed integers to an integer.

short[] numbers= { Int16.MinValue, -1, 0, 121, 340, Int16.MaxValue };
int result;

foreach (short number in numbers)
{
   result = Convert.ToInt32(number);
   Console.WriteLine("Converted the {0} value {1} to a {2} value {3}.",
                        number.GetType().Name, number,
                        result.GetType().Name, result);
}
// The example displays the following output:
//    Converted the Int16 value -32768 to a Int32 value -32768.
//    Converted the Int16 value -1 to a Int32 value -1.
//    Converted the Int16 value 0 to a Int32 value 0.
//    Converted the Int16 value 121 to a Int32 value 121.
//    Converted the Int16 value 340 to a Int32 value 340.
//    Converted the Int16 value 32767 to a Int32 value 32767.
Dim numbers() As Short = { Int16.MinValue, -1, 0, 121, 340, Int16.MaxValue }
Dim result As Integer

For Each number As Short In numbers
   result = Convert.ToInt32(number)
   Console.WriteLine("Converted the {0} value {1} to a {2} value {3}.", _
                        number.GetType().Name, number, _
                        result.GetType().Name, result)
Next
' The example displays the following output:
'    Converted the Int16 value -32768 to a Int32 value -32768.
'    Converted the Int16 value -1 to a Int32 value -1.
'    Converted the Int16 value 0 to a Int32 value 0.
'    Converted the Int16 value 121 to a Int32 value 121.
'    Converted the Int16 value 340 to a Int32 value 340.
'    Converted the Int16 value 32767 to a Int32 value 32767.

ToInt32(Decimal) ToInt32(Decimal) ToInt32(Decimal) ToInt32(Decimal)

Convierte el valor del número decimal especificado en un entero de 32 bits con signo equivalente.Converts the value of the specified decimal number to an equivalent 32-bit signed integer.

public:
 static int ToInt32(System::Decimal value);
public static int ToInt32 (decimal value);
static member ToInt32 : decimal -> int
Public Shared Function ToInt32 (value As Decimal) As Integer

Parámetros

value
Decimal Decimal Decimal Decimal

Número decimal que se va a convertir.The decimal number to convert.

Devoluciones

value, redondeado al entero de 32 bits con signo más próximo.value, rounded to the nearest 32-bit signed integer. Si value está en medio de dos números enteros, se devuelve el número par, es decir, 4,5 se convierte en 4 y 5,5 se convierte en 6.If value is halfway between two whole numbers, the even number is returned; that is, 4.5 is converted to 4, and 5.5 is converted to 6.

Excepciones

value es mayor que MaxValue o menor que MinValue.value is greater than MaxValue or less than MinValue.

Ejemplos

En el ejemplo siguiente se intenta convertir cada elemento de una matriz Decimal de valores en un entero.The following example attempts to convert each element in an array of Decimal values to an integer.

decimal[] values= { Decimal.MinValue, -1034.23m, -12m, 0m, 147m,
                    199.55m, 9214.16m, Decimal.MaxValue };
int result;

foreach (decimal value in values)
{
   try {
      result = Convert.ToInt32(value);
      Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.",
                        value.GetType().Name, value,
                        result.GetType().Name, result);
   }
   catch (OverflowException) {
      Console.WriteLine("{0} is outside the range of the Int32 type.",
                        value);
   }   
}                                  
// The example displays the following output:
//    -79228162514264337593543950335 is outside the range of the Int32 type.
//    Converted the Decimal value '-1034.23' to the Int32 value -1034.
//    Converted the Decimal value '-12' to the Int32 value -12.
//    Converted the Decimal value '0' to the Int32 value 0.
//    Converted the Decimal value '147' to the Int32 value 147.
//    Converted the Decimal value '199.55' to the Int32 value 200.
//    Converted the Decimal value '9214.16' to the Int32 value 9214.
//    79228162514264337593543950335 is outside the range of the Int32 type.
Dim values() As Decimal = { Decimal.MinValue, -1034.23d, -12d, 0d, 147d, _
                            199.55d, 9214.16d, Decimal.MaxValue }
Dim result As Integer

For Each value As Decimal In values
   Try
      result = Convert.ToInt32(value)
      Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.", _
                        value.GetType().Name, value, _
                        result.GetType().Name, result)
   Catch e As OverflowException
      Console.WriteLine("{0} is outside the range of the Int32 type.", _
                        value)
   End Try   
Next                                  
' The example displays the following output:
'    -79228162514264337593543950335 is outside the range of the Int32 type.
'    Converted the Decimal value '-1034.23' to the Int32 value -1034.
'    Converted the Decimal value '-12' to the Int32 value -12.
'    Converted the Decimal value '0' to the Int32 value 0.
'    Converted the Decimal value '147' to the Int32 value 147.
'    Converted the Decimal value '199.55' to the Int32 value 200.
'    Converted the Decimal value '9214.16' to the Int32 value 9214.
'    79228162514264337593543950335 is outside the range of the Int32 type.
Consulte también:

Se aplica a