Convert.ToDecimal Convert.ToDecimal Convert.ToDecimal Convert.ToDecimal Method

Definizione

Converte un valore specificato in un numero decimale.Converts a specified value to a decimal number.

Overload

ToDecimal(String, IFormatProvider) ToDecimal(String, IFormatProvider) ToDecimal(String, IFormatProvider) ToDecimal(String, IFormatProvider)

Converte la rappresentazione di stringa specificata di un numero in un numero decimale equivalente mediante le informazioni di formattazione specifiche delle impostazioni cultura indicate.Converts the specified string representation of a number to an equivalent decimal number, using the specified culture-specific formatting information.

ToDecimal(Object, IFormatProvider) ToDecimal(Object, IFormatProvider) ToDecimal(Object, IFormatProvider) ToDecimal(Object, IFormatProvider)

Converte il valore dell'oggetto specificato in un numero decimale equivalente mediante le informazioni di formattazione specifiche delle impostazioni cultura indicate.Converts the value of the specified object to an equivalent decimal number, using the specified culture-specific formatting information.

ToDecimal(UInt64) ToDecimal(UInt64) ToDecimal(UInt64) ToDecimal(UInt64)

Converte il valore dell'intero senza segno a 64 bit specificato in un numero decimale equivalente.Converts the value of the specified 64-bit unsigned integer to an equivalent decimal number.

ToDecimal(UInt32) ToDecimal(UInt32) ToDecimal(UInt32) ToDecimal(UInt32)

Converte il valore dell'intero senza segno a 32 bit specificato in un numero decimale equivalente.Converts the value of the specified 32-bit unsigned integer to an equivalent decimal number.

ToDecimal(UInt16) ToDecimal(UInt16) ToDecimal(UInt16) ToDecimal(UInt16)

Converte il valore dell'intero senza segno a 16 bit specificato in un numero decimale equivalente.Converts the value of the specified 16-bit unsigned integer to an equivalent decimal number.

ToDecimal(String) ToDecimal(String) ToDecimal(String) ToDecimal(String)

Converte la rappresentazione di stringa specificata di un numero in un numero decimale equivalente.Converts the specified string representation of a number to an equivalent decimal number.

ToDecimal(SByte) ToDecimal(SByte) ToDecimal(SByte) ToDecimal(SByte)

Converte il valore dell'intero con segno a 8 bit specificato nel numero decimale equivalente.Converts the value of the specified 8-bit signed integer to the equivalent decimal number.

ToDecimal(Object) ToDecimal(Object) ToDecimal(Object) ToDecimal(Object)

Converte il valore dell'oggetto specificato in un numero decimale equivalente.Converts the value of the specified object to an equivalent decimal number.

ToDecimal(Single) ToDecimal(Single) ToDecimal(Single) ToDecimal(Single)

Converte il valore del numero a virgola mobile e con precisione singola specificato nel numero decimale equivalente.Converts the value of the specified single-precision floating-point number to the equivalent decimal number.

ToDecimal(Int32) ToDecimal(Int32) ToDecimal(Int32) ToDecimal(Int32)

Converte il valore dell'intero con segno a 32 bit specificato in un numero decimale equivalente.Converts the value of the specified 32-bit signed integer to an equivalent decimal number.

ToDecimal(Boolean) ToDecimal(Boolean) ToDecimal(Boolean) ToDecimal(Boolean)

Converte il valore booleano specificato nel numero decimale equivalente.Converts the specified Boolean value to the equivalent decimal number.

ToDecimal(Byte) ToDecimal(Byte) ToDecimal(Byte) ToDecimal(Byte)

Converte il valore dell'intero senza segno a 8 bit specificato nel numero decimale equivalente.Converts the value of the specified 8-bit unsigned integer to the equivalent decimal number.

ToDecimal(Char) ToDecimal(Char) ToDecimal(Char) ToDecimal(Char)

La chiamata di questo metodo genera sempre un'eccezione InvalidCastException.Calling this method always throws InvalidCastException.

ToDecimal(Int64) ToDecimal(Int64) ToDecimal(Int64) ToDecimal(Int64)

Converte il valore dell'intero con segno a 64 bit specificato in un numero decimale equivalente.Converts the value of the specified 64-bit signed integer to an equivalent decimal number.

ToDecimal(Decimal) ToDecimal(Decimal) ToDecimal(Decimal) ToDecimal(Decimal)

Restituisce il numero decimale specificato; non viene eseguita alcuna conversione effettiva.Returns the specified decimal number; no actual conversion is performed.

ToDecimal(Double) ToDecimal(Double) ToDecimal(Double) ToDecimal(Double)

Converte il valore del numero a virgola mobile a precisione doppia specificato in un numero decimale equivalente.Converts the value of the specified double-precision floating-point number to an equivalent decimal number.

ToDecimal(Int16) ToDecimal(Int16) ToDecimal(Int16) ToDecimal(Int16)

Converte il valore dell'intero con segno a 16 bit specificato in un numero decimale equivalente.Converts the value of the specified 16-bit signed integer to an equivalent decimal number.

ToDecimal(DateTime) ToDecimal(DateTime) ToDecimal(DateTime) ToDecimal(DateTime)

La chiamata di questo metodo genera sempre un'eccezione InvalidCastException.Calling this method always throws InvalidCastException.

ToDecimal(String, IFormatProvider) ToDecimal(String, IFormatProvider) ToDecimal(String, IFormatProvider) ToDecimal(String, IFormatProvider)

Converte la rappresentazione di stringa specificata di un numero in un numero decimale equivalente mediante le informazioni di formattazione specifiche delle impostazioni cultura indicate.Converts the specified string representation of a number to an equivalent decimal number, using the specified culture-specific formatting information.

public:
 static System::Decimal ToDecimal(System::String ^ value, IFormatProvider ^ provider);
public static decimal ToDecimal (string value, IFormatProvider provider);
static member ToDecimal : string * IFormatProvider -> decimal
Public Shared Function ToDecimal (value As String, provider As IFormatProvider) As Decimal

Parametri

value
String String String String

Stringa contenente un numero da convertire.A string that contains a number to convert.

provider
IFormatProvider IFormatProvider IFormatProvider IFormatProvider

Oggetto che fornisce informazioni di formattazione specifiche delle impostazioni cultura.An object that supplies culture-specific formatting information.

Restituisce

Numero decimale equivalente al numero in value oppure 0 (zero) se value è null.A decimal number that is equivalent to the number in value, or 0 (zero) if value is null.

Eccezioni

value non è un numero in formato valido.value is not a number in a valid format.

L'oggetto value rappresenta un numero minore di MinValue o maggiore di MaxValue.value represents a number that is less than MinValue or greater than MaxValue.

Esempi

Nell'esempio seguente tenta di convertire una matrice di stringhe Decimal valori mediante NumberFormatInfo gli oggetti che rappresentano due diverse impostazioni cultura.The following example attempts to convert an array of strings to Decimal values by using NumberFormatInfo objects that represent two different cultures.

using System;
using System.Globalization;

public class Example
{
   public static void Main()
   {
      string[] values = { "123456789", "12345.6789", "12 345,6789",
                          "123,456.789", "123 456,789", "123,456,789.0123",
                          "123 456 789,0123" };
      CultureInfo[] cultures = { new CultureInfo("en-US"),
                                 new CultureInfo("fr-FR") }; 

      foreach (CultureInfo culture in cultures)
      {
         Console.WriteLine("String -> Decimal Conversion Using the {0} Culture",
                           culture.Name);
         foreach (string value in values)
         {
            Console.Write("{0,20}  ->  ", value);
            try {
               Console.WriteLine(Convert.ToDecimal(value, culture));
            }
            catch (FormatException) {
               Console.WriteLine("FormatException");
            }
         }
         Console.WriteLine();
      }                     
   }
}
// The example displays the following output:
//       String -> Decimal Conversion Using the en-US Culture
//                  123456789  ->  123456789
//                 12345.6789  ->  12345.6789
//                12 345,6789  ->  FormatException
//                123,456.789  ->  123456.789
//                123 456,789  ->  FormatException
//           123,456,789.0123  ->  123456789.0123
//           123 456 789,0123  ->  FormatException
//       
//       String -> Decimal Conversion Using the fr-FR Culture
//                  123456789  ->  123456789
//                 12345.6789  ->  FormatException
//                12 345,6789  ->  12345.6789
//                123,456.789  ->  FormatException
//                123 456,789  ->  123456.789
//           123,456,789.0123  ->  FormatException
//           123 456 789,0123  ->  123456789.0123
Imports System.Globalization

Module Example
   Public Sub Main()
      Dim values() As String = { "123456789", "12345.6789", "12 345,6789", _
                                 "123,456.789", "123 456,789", "123,456,789.0123", _
                                 "123 456 789,0123" }
      Dim cultures() As CultureInfo = { New CultureInfo("en-US"), _
                                        New CultureInfo("fr-FR") } 

      For Each culture As CultureInfo In cultures
         Console.WriteLine("String -> Decimal Conversion Using the {0} Culture", _
                           culture.Name)
         For Each value As String In values
            Console.Write("{0,20}  ->  ", value)
            Try
               Console.WriteLine(Convert.ToDecimal(value, culture))
            Catch e As FormatException
               Console.WriteLine("FormatException")
            End Try   
         Next
         Console.WriteLine()
      Next                     
   End Sub
End Module
' The example displays the following output:
'       String -> Decimal Conversion Using the en-US Culture
'                  123456789  ->  123456789
'                 12345.6789  ->  12345.6789
'                12 345,6789  ->  FormatException
'                123,456.789  ->  123456.789
'                123 456,789  ->  FormatException
'           123,456,789.0123  ->  123456789.0123
'           123 456 789,0123  ->  FormatException
'       
'       String -> Decimal Conversion Using the fr-FR Culture
'                  123456789  ->  123456789
'                 12345.6789  ->  FormatException
'                12 345,6789  ->  12345.6789
'                123,456.789  ->  FormatException
'                123 456,789  ->  123456.789
'           123,456,789.0123  ->  FormatException
'           123 456 789,0123  ->  123456789.0123

Commenti

Il valore restituito è il risultato ottenuto richiamando la Decimal.Parse metodo value.The return value is the result of invoking the Decimal.Parse method on value.

provider è un' IFormatProvider istanza che consente di ottenere un NumberFormatInfo oggetto.provider is an IFormatProvider instance that obtains a NumberFormatInfo object. Il NumberFormatInfo oggetto fornisce informazioni specifiche delle impostazioni cultura relative al formato di value.The NumberFormatInfo object provides culture-specific information about the format of value. Se provider viene null, il NumberFormatInfo per la lingua corrente viene utilizzata.If provider is null, the NumberFormatInfo for the current culture is used.

Se si preferisce non gestire un'eccezione se la conversione non riesce, è possibile chiamare il Decimal.TryParse metodo invece.If you prefer not to handle an exception if the conversion fails, you can call the Decimal.TryParse method instead. Restituisce un Boolean valore che indica se la conversione ha avuto esito positivo o negativo.It returns a Boolean value that indicates whether the conversion succeeded or failed.

ToDecimal(Object, IFormatProvider) ToDecimal(Object, IFormatProvider) ToDecimal(Object, IFormatProvider) ToDecimal(Object, IFormatProvider)

Converte il valore dell'oggetto specificato in un numero decimale equivalente mediante le informazioni di formattazione specifiche delle impostazioni cultura indicate.Converts the value of the specified object to an equivalent decimal number, using the specified culture-specific formatting information.

public:
 static System::Decimal ToDecimal(System::Object ^ value, IFormatProvider ^ provider);
public static decimal ToDecimal (object value, IFormatProvider provider);
static member ToDecimal : obj * IFormatProvider -> decimal
Public Shared Function ToDecimal (value As Object, provider As IFormatProvider) As Decimal

Parametri

value
Object Object Object Object

Oggetto che implementa l'interfaccia IConvertible.An object that implements the IConvertible interface.

provider
IFormatProvider IFormatProvider IFormatProvider IFormatProvider

Oggetto che fornisce informazioni di formattazione specifiche delle impostazioni cultura.An object that supplies culture-specific formatting information.

Restituisce

Numero decimale equivalente a value oppure 0 (zero) se value è null.A decimal number that is equivalent to value, or 0 (zero) if value is null.

Eccezioni

Il formato di value non è appropriato per un tipo Decimal.value is not in an appropriate format for a Decimal type.

value non implementa l'interfaccia IConvertible.value does not implement the IConvertible interface.

In alternativa-or- La conversione non è supportata.The conversion is not supported.

L'oggetto value rappresenta un numero minore di MinValue o maggiore di MaxValue.value represents a number that is less than MinValue or greater than MaxValue.

Esempi

Nell'esempio seguente viene definita una classe Temperature che implementa l'interfaccia IConvertible .The following example defines a Temperature class that implements the IConvertible interface.

using System;
using System.Globalization;

public class Temperature : IConvertible
{
   private decimal m_Temp;

   public Temperature(decimal temperature)
   {
      this.m_Temp = temperature;
   }
   
   public decimal Celsius
   {
      get { return this.m_Temp; }   
   }
   
   public decimal Kelvin
   {
      get { return this.m_Temp + 273.15m; }    
   }
   
   public decimal Fahrenheit
   {
      get { return Math.Round((decimal) (this.m_Temp * 9 / 5 + 32), 2); }
   }
   
   public override string ToString()
   {
      return m_Temp.ToString("N2") + " °C";
   }

   // IConvertible implementations.
   public TypeCode GetTypeCode()
   {
      return TypeCode.Object;
   }
   
   public bool ToBoolean(IFormatProvider provider) 
   {
      if (m_Temp == 0)
         return false;
      else
         return true;
   } 
   
   public byte ToByte(IFormatProvider provider)
   {
      if (m_Temp < Byte.MinValue || m_Temp > Byte.MaxValue)
         throw new OverflowException(String.Format("{0} is out of range of the Byte type.", 
                                                   this.m_Temp));
      else
         return Decimal.ToByte(this.m_Temp);
   }
   
   public char ToChar(IFormatProvider provider)
   {
      throw new InvalidCastException("Temperature to Char conversion is not supported.");
   } 
   
   public DateTime ToDateTime(IFormatProvider provider)
   {
      throw new InvalidCastException("Temperature to DateTime conversion is not supported.");
   }
   
   public decimal ToDecimal(IFormatProvider provider)
   {
      return this.m_Temp;
   }
   
   public double ToDouble(IFormatProvider provider)
   {
      return Decimal.ToDouble(this.m_Temp);
   }   
   
   public short ToInt16(IFormatProvider provider)
   {
      if (this.m_Temp < Int16.MinValue || this.m_Temp > Int16.MaxValue)
         throw new OverflowException(String.Format("{0} is out of range of the Int16 type.",
                                                   this.m_Temp));
      else
         return Decimal.ToInt16(this.m_Temp);
   }
   
   public int ToInt32(IFormatProvider provider)
      {
      if (this.m_Temp < Int32.MinValue || this.m_Temp > Int32.MaxValue)
         throw new OverflowException(String.Format("{0} is out of range of the Int32 type.",
                                                   this.m_Temp));
      else
         return Decimal.ToInt32(this.m_Temp);
   }
   
   public long ToInt64(IFormatProvider provider)
   {
      if (this.m_Temp < Int64.MinValue || this.m_Temp > Int64.MaxValue)
         throw new OverflowException(String.Format("{0} is out of range of the Int64 type.",
                                                   this.m_Temp));
      else
         return Decimal.ToInt64(this.m_Temp);
   }
   
   public sbyte ToSByte(IFormatProvider provider)
   {
      if (this.m_Temp < SByte.MinValue || this.m_Temp > SByte.MaxValue)
         throw new OverflowException(String.Format("{0} is out of range of the SByte type.",
                                                   this.m_Temp));
      else
         return Decimal.ToSByte(this.m_Temp);
   }

   public float ToSingle(IFormatProvider provider)
   {
      return Decimal.ToSingle(this.m_Temp);
   }

   public string ToString(IFormatProvider provider)
   {
      return m_Temp.ToString("N2", provider) + " °C";
   }
   
   public object ToType(Type conversionType, IFormatProvider provider)
   {
      switch (Type.GetTypeCode(conversionType))
      {
         case TypeCode.Boolean: 
            return this.ToBoolean(null);
         case TypeCode.Byte:
            return this.ToByte(null);
         case TypeCode.Char:
            return this.ToChar(null);
         case TypeCode.DateTime:
            return this.ToDateTime(null);
         case TypeCode.Decimal:
            return this.ToDecimal(null);
         case TypeCode.Double:
            return this.ToDouble(null);
         case TypeCode.Int16:
            return this.ToInt16(null);
         case TypeCode.Int32:
            return this.ToInt32(null);
         case TypeCode.Int64:
            return this.ToInt64(null);
         case TypeCode.Object:
            if (typeof(Temperature).Equals(conversionType))
               return this;
            else
               throw new InvalidCastException(String.Format("Conversion to a {0} is not supported.",
                                                            conversionType.Name));
         case TypeCode.SByte:
            return this.ToSByte(null);
         case TypeCode.Single:
            return this.ToSingle(null);
         case TypeCode.String:
            return this.ToString(provider);
         case TypeCode.UInt16:
            return this.ToUInt16(null);
         case TypeCode.UInt32:
            return this.ToUInt32(null);
         case TypeCode.UInt64:
            return this.ToUInt64(null);   
         default:
            throw new InvalidCastException(String.Format("Conversion to {0} is not supported.", conversionType.Name));   
      }
   }
   
   public ushort ToUInt16(IFormatProvider provider)
   {
      if (this.m_Temp < UInt16.MinValue || this.m_Temp > UInt16.MaxValue)
         throw new OverflowException(String.Format("{0} is out of range of the UInt16 type.",
                                                   this.m_Temp));
      else
         return Decimal.ToUInt16(this.m_Temp);
   }

   public uint ToUInt32(IFormatProvider provider)
   {
      if (this.m_Temp < UInt32.MinValue || this.m_Temp > UInt32.MaxValue)
         throw new OverflowException(String.Format("{0} is out of range of the UInt32 type.",
                                                   this.m_Temp));
      else
         return Decimal.ToUInt32(this.m_Temp);
   }
   
   public ulong ToUInt64(IFormatProvider provider)
   {
      if (this.m_Temp < UInt64.MinValue || this.m_Temp > UInt64.MaxValue)
         throw new OverflowException(String.Format("{0} is out of range of the UInt64 type.",
                                                   this.m_Temp));
      else
         return Decimal.ToUInt64(this.m_Temp);
   }
}
Imports System.Globalization

Public Class Temperature : Implements IConvertible
   Private m_Temp As Decimal

   Public Sub New(temperature As Decimal)
      Me.m_Temp = temperature
   End Sub
   
   Public ReadOnly Property Celsius() As Decimal
      Get
         Return Me.m_Temp
      End Get   
   End Property
   
   Public ReadOnly Property Kelvin() As Decimal
      Get
         Return Me.m_Temp + 273.15d   
      End Get
   End Property
   
   Public ReadOnly Property Fahrenheit() As Decimal
      Get
         Return Math.Round(CDec(Me.m_Temp * 9 / 5 + 32), 2)
      End Get      
   End Property
   
   Public Overrides Function ToString() As String
      Return m_Temp.ToString("N2") & " °C"
   End Function

   ' IConvertible implementations.
   Public Function GetTypeCode() As TypeCode _
                   Implements IConvertible.GetTypeCode
      Return TypeCode.Object
   End Function
   
   Public Function ToBoolean(provider As IFormatProvider) As Boolean _
                   Implements IConvertible.ToBoolean
      If m_Temp = 0 Then
         Return False
      Else
         Return True
      End If
   End Function 
   
   Public Function ToByte(provider As IFormatProvider) As Byte _
                   Implements IConvertible.ToByte
      If m_Temp < Byte.MinValue Or m_Temp > Byte.MaxValue Then
         Throw New OverflowException(String.Format("{0} is out of range of the Byte type.", _ 
                                                   Me.m_Temp)) 
      Else
         Return Decimal.ToByte(Me.m_Temp)
      End If       
   End Function
   
   Public Function ToChar(provider As IFormatProvider) As Char _
                   Implements IConvertible.ToChar
      Throw New InvalidCastException("Temperature to Char conversion is not supported.")
   End Function 
   
   Public Function ToDateTime(provider As IFormatProvider) As Date _
                   Implements IConvertible.ToDateTime
      Throw New InvalidCastException("Temperature to DateTime conversion is not supported.")
   End Function
   
   Public Function ToDecimal(provider As IFormatProvider) As Decimal _
                   Implements IConvertible.ToDecimal
      Return Me.m_Temp
   End Function
   
   Public Function ToDouble(provider As IFormatProvider) As Double _
                   Implements IConvertible.ToDouble
      Return Decimal.ToDouble(Me.m_Temp)
   End Function   
   
   Public Function ToInt16(provider As IFormatProvider) As Int16 _
                   Implements IConvertible.ToInt16
      If Me.m_Temp < Int16.MinValue Or Me.m_Temp > Int16.MaxValue Then
         Throw New OverflowException(String.Format("{0} is out of range of the Int16 type.", _
                                                   Me.m_Temp))
      Else
         Return Decimal.ToInt16(Me.m_Temp)   
      End If
   End Function
   
   Public Function ToInt32(provider As IFormatProvider) As Int32 _
                   Implements IConvertible.ToInt32
      If Me.m_Temp < Int32.MinValue Or Me.m_Temp > Int32.MaxValue Then
         Throw New OverflowException(String.Format("{0} is out of range of the Int32 type.", _
                                                   Me.m_Temp))
      Else
         Return Decimal.ToInt32(Me.m_Temp)
      End If      
   End Function
   
   Public Function ToInt64(provider As IFormatProvider) As Int64 _
                   Implements IConvertible.ToInt64
      If Me.m_Temp < Int64.MinValue Or Me.m_Temp > Int64.MaxValue Then
         Throw New OverflowException(String.Format("{0} is out of range of the Int64 type.", _
                                                   Me.m_Temp))
      Else
         Return Decimal.ToInt64(Me.m_Temp)
      End If      
   End Function
   
   Public Function ToSByte(provider As IFormatProvider) As SByte _
                   Implements IConvertible.ToSByte
      If Me.m_Temp < SByte.MinValue Or Me.m_Temp > SByte.MaxValue Then
         Throw New OverflowException(String.Format("{0} is out of range of the SByte type.", _
                                                   Me.m_Temp))
      Else
         Return Decimal.ToSByte(Me.m_Temp)
      End If      
   End Function

   Public Function ToSingle(provider As IFormatProvider) As Single _
                   Implements IConvertible.ToSingle
      Return Decimal.ToSingle(Me.m_Temp)
   End Function

   Public Overloads Function ToString(provider As IFormatProvider) As String _
                   Implements IConvertible.ToString
      Return m_Temp.ToString("N2", provider) & " °C"
   End Function
   
   Public Function ToType(conversionType As Type, provider As IFormatProvider) As Object _
                   Implements IConvertible.ToType
      Select Case Type.GetTypeCode(conversionType)
         Case TypeCode.Boolean 
            Return Me.ToBoolean(Nothing)
         Case TypeCode.Byte
            Return Me.ToByte(Nothing)
         Case TypeCode.Char
            Return Me.ToChar(Nothing)
         Case TypeCode.DateTime
            Return Me.ToDateTime(Nothing)
         Case TypeCode.Decimal
            Return Me.ToDecimal(Nothing)
         Case TypeCode.Double
            Return Me.ToDouble(Nothing)
         Case TypeCode.Int16
            Return Me.ToInt16(Nothing)
         Case TypeCode.Int32
            Return Me.ToInt32(Nothing)
         Case TypeCode.Int64
            Return Me.ToInt64(Nothing)
         Case TypeCode.Object
            If GetType(Temperature).Equals(conversionType) Then
               Return Me
            Else
               Throw New InvalidCastException(String.Format("Conversion to a {0} is not supported.", _
                                                            conversionType.Name))
            End If 
         Case TypeCode.SByte
            Return Me.ToSByte(Nothing)
         Case TypeCode.Single
            Return Me.ToSingle(Nothing)
         Case TypeCode.String
            Return Me.ToString(provider)
         Case TypeCode.UInt16
            Return Me.ToUInt16(Nothing)
         Case TypeCode.UInt32
            Return Me.ToUInt32(Nothing)
         Case TypeCode.UInt64
            Return Me.ToUInt64(Nothing)   
         Case Else
            Throw New InvalidCastException(String.Format("Conversion to {0} is not supported.", conversionType.Name))   
      End Select
   End Function
   
   Public Function ToUInt16(provider As IFormatProvider) As UInt16 _
                   Implements IConvertible.ToUInt16
      If Me.m_Temp < UInt16.MinValue Or Me.m_Temp > UInt16.MaxValue Then
         Throw New OverflowException(String.Format("{0} is out of range of the UInt16 type.", _
                                                   Me.m_Temp))
      Else
         Return Decimal.ToUInt16(Me.m_Temp)
      End If   
   End Function

   Public Function ToUInt32(provider As IFormatProvider) As UInt32 _
                   Implements IConvertible.ToUInt32
      If Me.m_Temp < UInt32.MinValue Or Me.m_Temp > UInt32.MaxValue Then
         Throw New OverflowException(String.Format("{0} is out of range of the UInt32 type.", _
                                                   Me.m_Temp))
      Else
         Return Decimal.ToUInt32(Me.m_Temp)
      End If   
   End Function
   
   Public Function ToUInt64(provider As IFormatProvider) As UInt64 _
                   Implements IConvertible.ToUInt64
      If Me.m_Temp < UInt64.MinValue Or Me.m_Temp > UInt64.MaxValue Then
         Throw New OverflowException(String.Format("{0} is out of range of the UInt64 type.", _
                                                   Me.m_Temp))
      Else
         Return Decimal.ToUInt64(Me.m_temp)
      End If   
   End Function
End Class

L'esempio seguente mostra che quando un Temperature oggetto viene passato come parametro per il ToDecimal(Object, IFormatProvider) metodo, il IConvertible.ToDecimal implementazione del Temperature classe viene chiamata per eseguire la conversione.The following example shows that when a Temperature object is passed as a parameter to the ToDecimal(Object, IFormatProvider) method, the IConvertible.ToDecimal implementation of the Temperature class is called to perform the conversion.

public class Example
{
   public static void Main()
   {
      Temperature cold = new Temperature(-40);
      Temperature freezing = new Temperature(0);
      Temperature boiling = new Temperature(100);
      
      Console.WriteLine(Convert.ToDecimal(cold, null));
      Console.WriteLine(Convert.ToDecimal(freezing, null));
      Console.WriteLine(Convert.ToDecimal(boiling, null));
   }
}
// The example dosplays the following output:
//       -40
//       0
//       100
Module Example
   Public Sub Main()
      Dim cold As New Temperature(-40)
      Dim freezing As New Temperature(0)
      Dim boiling As New Temperature(100)
      
      Console.WriteLine(Convert.ToDecimal(cold, Nothing))
      Console.WriteLine(Convert.ToDecimal(freezing, Nothing))
      Console.WriteLine(Convert.ToDecimal(boiling, Nothing))
   End Sub
End Module
' The example displays the following output:
'       -40
'       0
'       100

Commenti

Il valore restituito è il risultato ottenuto richiamando la IConvertible.ToDecimal metodo del tipo sottostante di value.The return value is the result of invoking the IConvertible.ToDecimal method of the underlying type of value.

provider consente all'utente di specificare le informazioni specifiche delle impostazioni cultura conversione sul contenuto di value.provider enables the user to specify culture-specific conversion information about the contents of value. Ignorano i tipi di base provider; tuttavia, il parametro può essere utilizzato se value è un tipo definito dall'utente che implementa il IConvertible interfaccia.The base types ignore provider; however, the parameter may be used if value is a user-defined type that implements the IConvertible interface.

Vedi anche

ToDecimal(UInt64) ToDecimal(UInt64) ToDecimal(UInt64) ToDecimal(UInt64)

Importante

Questa API non è conforme a CLS.

Converte il valore dell'intero senza segno a 64 bit specificato in un numero decimale equivalente.Converts the value of the specified 64-bit unsigned integer to an equivalent decimal number.

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

Parametri

value
UInt64 UInt64 UInt64 UInt64

Intero senza segno a 64 bit da convertire.The 64-bit unsigned integer to convert.

Restituisce

Numero decimale equivalente a value.A decimal number that is equivalent to value.

Esempi

Nell'esempio seguente converte una matrice di valori unsigned long integer a Decimal valori.The following example converts an array of unsigned long integers to Decimal values.

ulong[] numbers = { UInt64.MinValue, 121, 12345, UInt64.MaxValue };
decimal result;

foreach (ulong number in numbers)
{
   result = Convert.ToDecimal(number);
   Console.WriteLine("Converted the UInt64 value {0} to {1}.",
                     number, result);
}   
// The example displays the following output:
//    Converted the UInt64 value 0 to 0.
//    Converted the UInt64 value 121 to 121.
//    Converted the UInt64 value 12345 to 12345.
//    Converted the UInt64 value 18446744073709551615 to 18446744073709551615.
Dim numbers() As ULong = { UInt64.MinValue, 121, 12345, UInt64.MaxValue }
Dim result As Decimal

For Each number As ULong In numbers
   result = Convert.ToDecimal(number)
   Console.WriteLine("Converted the UInt64 value {0} to {1}.", _
                     number, result)
Next   
' The example displays the following output:
'    Converted the UInt64 value 0 to 0.
'    Converted the UInt64 value 121 to 121.
'    Converted the UInt64 value 12345 to 12345.
'    Converted the UInt64 value 18446744073709551615 to 18446744073709551615.
Vedi anche

ToDecimal(UInt32) ToDecimal(UInt32) ToDecimal(UInt32) ToDecimal(UInt32)

Importante

Questa API non è conforme a CLS.

Converte il valore dell'intero senza segno a 32 bit specificato in un numero decimale equivalente.Converts the value of the specified 32-bit unsigned integer to an equivalent decimal number.

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

Parametri

value
UInt32 UInt32 UInt32 UInt32

Intero senza segno a 32 bit da convertire.The 32-bit unsigned integer to convert.

Restituisce

Numero decimale equivalente a value.A decimal number that is equivalent to value.

Esempi

Nell'esempio seguente converte una matrice di interi senza segno da Decimal valori.The following example converts an array of unsigned integers to Decimal values.

uint[] numbers = { UInt32.MinValue, 121, 12345, UInt32.MaxValue };
decimal result;

foreach (uint number in numbers)
{
   result = Convert.ToDecimal(number);
   Console.WriteLine("Converted the UInt32 value {0} to {1}.",
                     number, result);
}   
// The example displays the following output:
//       Converted the UInt32 value 0 to 0.
//       Converted the UInt32 value 121 to 121.
//       Converted the UInt32 value 12345 to 12345.
//       Converted the UInt32 value 4294967295 to 4294967295.
Dim numbers() As UInteger = { UInt32.MinValue, 121, 12345, UInt32.MaxValue }
Dim result As Decimal

For Each number As UInteger In numbers
   result = Convert.ToDecimal(number)
   Console.WriteLine("Converted the UInt32 value {0} to {1}.", _
                     number, result)
Next   
' The example displays the following output:
'       Converted the UInt32 value 0 to 0.
'       Converted the UInt32 value 121 to 121.
'       Converted the UInt32 value 12345 to 12345.
'       Converted the UInt32 value 4294967295 to 4294967295.
Vedi anche

ToDecimal(UInt16) ToDecimal(UInt16) ToDecimal(UInt16) ToDecimal(UInt16)

Importante

Questa API non è conforme a CLS.

Converte il valore dell'intero senza segno a 16 bit specificato in un numero decimale equivalente.Converts the value of the specified 16-bit unsigned integer to an equivalent decimal number.

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

Parametri

value
UInt16 UInt16 UInt16 UInt16

Intero senza segno a 16 bit da convertire.The 16-bit unsigned integer to convert.

Restituisce

Numero decimale equivalente a value.The decimal number that is equivalent to value.

Esempi

Nell'esempio seguente converte una matrice di interi senza segno a 16 bit a Decimal valori.The following example converts an array of 16-bit unsigned integers to Decimal values.

ushort[] numbers = { UInt16.MinValue, 121, 12345, UInt16.MaxValue };
decimal result;

foreach (ushort number in numbers)
{
   result = Convert.ToDecimal(number);
   Console.WriteLine("Converted the UInt16 value {0} to {1}.",
                     number, result);
}   
// The example displays the following output:
//       Converted the UInt16 value 0 to 0.
//       Converted the UInt16 value 121 to 121.
//       Converted the UInt16 value 12345 to 12345.
//       Converted the UInt16 value 65535 to 65535.      
Dim numbers() As UShort = { UInt16.MinValue, 121, 12345, UInt16.MaxValue }
Dim result As Decimal

For Each number As UShort In numbers
   result = Convert.ToDecimal(number)
   Console.WriteLine("Converted the UInt16 value {0} to {1}.", _
                     number, result)
Next   
' The example displays the following output:
'       Converted the UInt16 value 0 to 0.
'       Converted the UInt16 value 121 to 121.
'       Converted the UInt16 value 12345 to 12345.
'       Converted the UInt16 value 65535 to 65535.      
Vedi anche

ToDecimal(String) ToDecimal(String) ToDecimal(String) ToDecimal(String)

Converte la rappresentazione di stringa specificata di un numero in un numero decimale equivalente.Converts the specified string representation of a number to an equivalent decimal number.

public:
 static System::Decimal ToDecimal(System::String ^ value);
public static decimal ToDecimal (string value);
static member ToDecimal : string -> decimal
Public Shared Function ToDecimal (value As String) As Decimal

Parametri

value
String String String String

Stringa contenente un numero da convertire.A string that contains a number to convert.

Restituisce

Numero decimale equivalente al numero in value oppure 0 (zero) se value è null.A decimal number that is equivalent to the number in value, or 0 (zero) if value is null.

Eccezioni

value non è un numero in formato valido.value is not a number in a valid format.

L'oggetto value rappresenta un numero minore di MinValue o maggiore di MaxValue.value represents a number that is less than MinValue or greater than MaxValue.

Esempi

Nell'esempio seguente viene illustrato l'utilizzo di ToDecimal.The following example illustrates the use of ToDecimal. Tenta di convertire un String a un Decimale genera le eccezioni che possono verificarsi durante la conversione.It attempts to convert a String to a Decimal, and throws the possible exceptions that may arise during the conversion.

public:
   void ConvertStringDecimal( String^ stringVal )
   {
      Decimal decimalVal = 0;

      try
      {
         decimalVal = System::Convert::ToDecimal( stringVal );
         System::Console::WriteLine( "The String as a decimal is {0}.",
         decimalVal );
      }
      catch ( System::OverflowException^ ) 
      {
         System::Console::WriteLine(
            "The conversion from String to decimal overflowed." );
      }
      catch ( System::FormatException^ ) 
      {
         System::Console::WriteLine(
            "The String is not formatted as a decimal." );
      }
      catch ( System::ArgumentNullException^ ) 
      {
         System::Console::WriteLine( "The String is 0." );
      }
      
      // Decimal to String conversion will not overflow.
      stringVal = System::Convert::ToString( decimalVal );
      System::Console::WriteLine(
         "The decimal as a String is {0}.", stringVal );
   }
public void ConvertStringDecimal(string stringVal) {
	decimal decimalVal = 0;
	
	try {
		decimalVal = System.Convert.ToDecimal(stringVal);
		System.Console.WriteLine(
			"The string as a decimal is {0}.", decimalVal);
	} 
	catch (System.OverflowException){
		System.Console.WriteLine(
			"The conversion from string to decimal overflowed.");
	}
	catch (System.FormatException) {
		System.Console.WriteLine(
			"The string is not formatted as a decimal.");
	}
	catch (System.ArgumentNullException) {
		System.Console.WriteLine(
			"The string is null.");
	}

	// Decimal to string conversion will not overflow.
	stringVal = System.Convert.ToString(decimalVal);
	System.Console.WriteLine(
		"The decimal as a string is {0}.", stringVal);
}	
Public Sub ConvertStringDecimal(ByVal stringVal As String)
    Dim decimalVal As Decimal = 0

    Try
        decimalVal = System.Convert.ToDecimal(stringVal)
        System.Console.WriteLine("The string as a decimal is {0}.", _
                                  decimalVal)
    Catch exception As System.OverflowException
        System.Console.WriteLine( _
            "Overflow in string-to-decimal conversion.")
    Catch exception As System.FormatException
        System.Console.WriteLine( _
            "The string is not formatted as a decimal.")
    Catch exception As System.ArgumentException
        System.Console.WriteLine("The string is null.")
    End Try

    ' Decimal to string conversion will not overflow.
    stringVal = System.Convert.ToString(decimalVal)
    System.Console.WriteLine("The decimal as a string is {0}.", _
                              stringVal)
End Sub

Commenti

Usando il ToDecimal(String) metodo equivale a passare value per il Decimal.Parse(String) (metodo).Using the ToDecimal(String) method is equivalent to passing value to the Decimal.Parse(String) method. value viene interpretato utilizzando le convenzioni di formattazione delle impostazioni cultura del thread corrente.value is interpreted by using the formatting conventions of the current thread culture.

Se si preferisce non gestire un'eccezione se la conversione non riesce, è possibile chiamare il Decimal.TryParse metodo invece.If you prefer not to handle an exception if the conversion fails, you can call the Decimal.TryParse method instead. Restituisce un Boolean valore che indica se la conversione ha avuto esito positivo o negativo.It returns a Boolean value that indicates whether the conversion succeeded or failed.

ToDecimal(SByte) ToDecimal(SByte) ToDecimal(SByte) ToDecimal(SByte)

Importante

Questa API non è conforme a CLS.

Converte il valore dell'intero con segno a 8 bit specificato nel numero decimale equivalente.Converts the value of the specified 8-bit signed integer to the equivalent decimal number.

public:
 static System::Decimal ToDecimal(System::SByte value);
[System.CLSCompliant(false)]
public static decimal ToDecimal (sbyte value);
static member ToDecimal : sbyte -> decimal
Public Shared Function ToDecimal (value As SByte) As Decimal

Parametri

value
SByte SByte SByte SByte

Intero con segno a 8 bit da convertire.The 8-bit signed integer to convert.

Restituisce

Numero decimale equivalente a value.A decimal number that is equivalent to value.

Esempi

L'esempio seguente converte ogni elemento in una matrice di byte con segno da un Decimal valore.The following example converts each element in an array of signed bytes to a Decimal value.

sbyte[] numbers = { SByte.MinValue, -23, 0, 17, SByte.MaxValue };
decimal result;

foreach (sbyte number in numbers)
{
   result = Convert.ToDecimal(number);
   Console.WriteLine("Converted the SByte value {0} to {1}.", number, result);
}
//       Converted the SByte value -128 to -128.
//       Converted the SByte value -23 to -23.
//       Converted the SByte value 0 to 0.
//       Converted the SByte value 17 to 17.
//       Converted the SByte value 127 to 127.
Dim numbers() As SByte = { SByte.MinValue, -23, 0, 17, SByte.MaxValue }
Dim result As Decimal

For Each number As SByte In numbers
   result = Convert.ToDecimal(number)
   Console.WriteLine("Converted the SByte value {0} to {1}.", number, result)
Next
'       Converted the SByte value -128 to -128.
'       Converted the SByte value -23 to -23.
'       Converted the SByte value 0 to 0.
'       Converted the SByte value 17 to 17.
'       Converted the SByte value 127 to 127.
Vedi anche

ToDecimal(Object) ToDecimal(Object) ToDecimal(Object) ToDecimal(Object)

Converte il valore dell'oggetto specificato in un numero decimale equivalente.Converts the value of the specified object to an equivalent decimal number.

public:
 static System::Decimal ToDecimal(System::Object ^ value);
public static decimal ToDecimal (object value);
static member ToDecimal : obj -> decimal
Public Shared Function ToDecimal (value As Object) As Decimal

Parametri

value
Object Object Object Object

Oggetto che implementa l'interfaccia IConvertible oppure null.An object that implements the IConvertible interface, or null.

Restituisce

Numero decimale equivalente a value oppure 0 (zero) se value è null.A decimal number that is equivalent to value, or 0 (zero) if value is null.

Eccezioni

Il formato di value non è appropriato per un tipo Decimal.value is not in an appropriate format for a Decimal type.

value non implementa l'interfaccia IConvertible.value does not implement the IConvertible interface.

In alternativa-or- La conversione non è supportata.The conversion is not supported.

L'oggetto value rappresenta un numero minore di MinValue o maggiore di MaxValue.value represents a number that is less than MinValue or greater than MaxValue.

Esempi

Nell'esempio seguente prova a convertire ogni elemento nella matrice di oggetti per un Decimal valore.The following example tries to convert each element in an object array to a Decimal value.

object[] values = { true, 'a', 123, 1.764e32, "9.78", "1e-02",
                    1.67e03, "A100", "1,033.67", DateTime.Now,
                    Double.MaxValue };   
decimal result;

foreach (object value in values)
{
   try {
      result = Convert.ToDecimal(value);
      Console.WriteLine("Converted the {0} value {1} to {2}.",
                        value.GetType().Name, value, result);
   }                     
   catch (OverflowException) {
      Console.WriteLine("The {0} value {1} is out of range of the Decimal type.",
                        value.GetType().Name, value);
   }                     
   catch (FormatException) {
      Console.WriteLine("The {0} value {1} is not recognized as a valid Decimal value.",
                        value.GetType().Name, value);
   }                     
   catch (InvalidCastException) {
      Console.WriteLine("Conversion of the {0} value {1} to a Decimal is not supported.",
                        value.GetType().Name, value);
   }                     
}
// The example displays the following output:
//    Converted the Boolean value True to 1.
//    Conversion of the Char value a to a Decimal is not supported.
//    Converted the Int32 value 123 to 123.
//    The Double value 1.764E+32 is out of range of the Decimal type.
//    Converted the String value 9.78 to 9.78.
//    The String value 1e-02 is not recognized as a valid Decimal value.
//    Converted the Double value 1670 to 1670.
//    The String value A100 is not recognized as a valid Decimal value.
//    Converted the String value 1,033.67 to 1033.67.
//    Conversion of the DateTime value 10/15/2008 05:40:42 PM to a Decimal is not supported.
//    The Double value 1.79769313486232E+308 is out of range of the Decimal type.      
Dim values() As Object = { True, "a"c, 123, 1.764e32, "9.78", "1e-02", _
                           1.67e03, "A100", "1,033.67", Date.Now, _
                           Double.MaxValue }   
Dim result As Decimal

For Each value As Object In values
   Try
      result = Convert.ToDecimal(value)
      Console.WriteLine("Converted the {0} value {1} to {2}.", _
                        value.GetType().Name, value, result)
   Catch e As OverflowException
      Console.WriteLine("The {0} value {1} is out of range of the Decimal type.", _
                        value.GetType().Name, value)
   Catch e As FormatException
      Console.WriteLine("The {0} value {1} is not recognized as a valid Decimal value.", _
                        value.GetType().Name, value)
   Catch e As InvalidCastException
      Console.WriteLine("Conversion of the {0} value {1} to a Decimal is not supported.", _
                        value.GetType().Name, value)
   End Try                     
Next
' The example displays the following output:
'    Converted the Boolean value True to 1.
'    Conversion of the Char value a to a Decimal is not supported.
'    Converted the Int32 value 123 to 123.
'    The Double value 1.764E+32 is out of range of the Decimal type.
'    Converted the String value 9.78 to 9.78.
'    The String value 1e-02 is not recognized as a valid Decimal value.
'    Converted the Double value 1670 to 1670.
'    The String value A100 is not recognized as a valid Decimal value.
'    Converted the String value 1,033.67 to 1033.67.
'    Conversion of the DateTime value 10/15/2008 05:40:42 PM to a Decimal is not supported.
'    The Double value 1.79769313486232E+308 is out of range of the Decimal type.      

Commenti

Il valore restituito è il risultato ottenuto richiamando la IConvertible.ToDecimal metodo del tipo sottostante di value.The return value is the result of invoking the IConvertible.ToDecimal method of the underlying type of value.

Vedi anche

ToDecimal(Single) ToDecimal(Single) ToDecimal(Single) ToDecimal(Single)

Converte il valore del numero a virgola mobile e con precisione singola specificato nel numero decimale equivalente.Converts the value of the specified single-precision floating-point number to the equivalent decimal number.

public:
 static System::Decimal ToDecimal(float value);
public static decimal ToDecimal (float value);
static member ToDecimal : single -> decimal
Public Shared Function ToDecimal (value As Single) As Decimal

Parametri

value
Single Single Single Single

Numero a virgola mobile a precisione singola da convertire.The single-precision floating-point number to convert.

Restituisce

Numero decimale equivalente a value.A decimal number that is equivalent to value.

Eccezioni

value è maggiore di MaxValue o minore di MinValue.value is greater than MaxValue or less than MinValue.

Esempi

Nell'esempio seguente prova a convertire ogni elemento in una matrice di Single valori da un Decimal valore.The following example tries to convert each element in an array of Single values to a Decimal value.

float[] numbers = { Single.MinValue, -3e10f, -1093.54f, 0f, 1e-03f,
                    1034.23f, Single.MaxValue };
decimal result;

foreach (float number in numbers)
{
   try {
      result = Convert.ToDecimal(number);
      Console.WriteLine("Converted the Single value {0} to {1}.", number, result);
   }   
   catch (OverflowException) {
      Console.WriteLine("{0} is out of range of the Decimal type.", number);
   }
}                                  
// The example displays the following output:
//       -3.402823E+38 is out of range of the Decimal type.
//       Converted the Single value -3E+10 to -30000000000.
//       Converted the Single value -1093.54 to -1093.54.
//       Converted the Single value 0 to 0.
//       Converted the Single value 0.001 to 0.001.
//       Converted the Single value 1034.23 to 1034.23.
//       3.402823E+38 is out of range of the Decimal type.
Dim numbers() As Single = { Single.MinValue, -3e10, -1093.54, 0, 1e-03, _
                            1034.23, Single.MaxValue }
Dim result As Decimal

For Each number As Single In numbers
   Try
      result = Convert.ToDecimal(number)
      Console.WriteLine("Converted the Single value {0} to {1}.", number, result)
   Catch e As OverflowException
      Console.WriteLine("{0} is out of range of the Decimal type.", number)
   End Try
Next                                  
' The example displays the following output:
'       -3.402823E+38 is out of range of the Decimal type.
'       Converted the Single value -3E+10 to -30000000000.
'       Converted the Single value -1093.54 to -1093.54.
'       Converted the Single value 0 to 0.
'       Converted the Single value 0.001 to 0.001.
'       Converted the Single value 1034.23 to 1034.23.
'       3.402823E+38 is out of range of the Decimal type.

Commenti

Il Decimal valore restituito da questo metodo contiene un massimo di sette cifre significative.The Decimal value returned by this method contains a maximum of seven significant digits. Se il value parametro contiene più di sette cifre significative, il valore viene arrotondato al valore più vicino.If the value parameter contains more than seven significant digits, it is rounded using rounding to nearest. Nell'esempio seguente viene illustrato come la ToDecimal(Single) metodo Usa l'arrotondamento al più vicino a restituire un Decimal valore con un numero di cifre significative.The following example illustrates how the ToDecimal(Single) method uses rounding to nearest to return a Decimal value with seven significant digits.

Console.WriteLine(Convert.ToDecimal(1234567500.12F));  // Displays 1234568000
Console.WriteLine(Convert.ToDecimal(1234568500.12F));  // Displays 1234568000

Console.WriteLine(Convert.ToDecimal(10.980365F));      // Displays 10.98036 
Console.WriteLine(Convert.ToDecimal(10.980355F));      // Displays 10.98036
Console.WriteLine(Convert.ToDecimal(1234567500.12f))   ' Displays 1234568000
Console.WriteLine(Convert.ToDecimal(1234568500.12f))   ' Displays 1234568000

Console.WriteLine(Convert.ToDecimal(10.980365f))       ' Displays 10.98036 
Console.WriteLine(Convert.ToDecimal(10.980355f))       ' Displays 10.98036
Vedi anche

ToDecimal(Int32) ToDecimal(Int32) ToDecimal(Int32) ToDecimal(Int32)

Converte il valore dell'intero con segno a 32 bit specificato in un numero decimale equivalente.Converts the value of the specified 32-bit signed integer to an equivalent decimal number.

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

Parametri

value
Int32 Int32 Int32 Int32

Intero con segno a 32 bit da convertire.The 32-bit signed integer to convert.

Restituisce

Numero decimale equivalente a value.A decimal number that is equivalent to value.

Esempi

Nell'esempio seguente converte una matrice di interi con segno da Decimal valori.The following example converts an array of signed integers to Decimal values.

int[] numbers = { Int32.MinValue, -1000, 0, 1000, Int32.MaxValue };
decimal result;

foreach (int number in numbers)
{
   result = Convert.ToDecimal(number);
   Console.WriteLine("Converted the Int32 value {0} to the Decimal value {1}.",
                     number, result);
}
// The example displays the following output:
//    Converted the Int32 value -2147483648 to the Decimal value -2147483648.
//    Converted the Int32 value -1000 to the Decimal value -1000.
//    Converted the Int32 value 0 to the Decimal value 0.
//    Converted the Int32 value 1000 to the Decimal value 1000.
//    Converted the Int32 value 2147483647 to the Decimal value 2147483647.      
Dim numbers() As Integer = { Int32.MinValue, -1000, 0, 1000, Int32.MaxValue }
Dim result As Decimal

For Each number As Integer In numbers
   result = Convert.ToDecimal(number)
   Console.WriteLine("Converted the Int32 value {0} to the Decimal value {1}.", _
                     number, result)
Next
' The example displays the following output:
'    Converted the Int32 value -2147483648 to the Decimal value -2147483648.
'    Converted the Int32 value -1000 to the Decimal value -1000.
'    Converted the Int32 value 0 to the Decimal value 0.
'    Converted the Int32 value 1000 to the Decimal value 1000.
'    Converted the Int32 value 2147483647 to the Decimal value 2147483647.      
Vedi anche

ToDecimal(Boolean) ToDecimal(Boolean) ToDecimal(Boolean) ToDecimal(Boolean)

Converte il valore booleano specificato nel numero decimale equivalente.Converts the specified Boolean value to the equivalent decimal number.

public:
 static System::Decimal ToDecimal(bool value);
public static decimal ToDecimal (bool value);
static member ToDecimal : bool -> decimal
Public Shared Function ToDecimal (value As Boolean) As Decimal

Parametri

value
Boolean Boolean Boolean Boolean

Valore booleano da convertire.The Boolean value to convert.

Restituisce

Il numero 1 se value è true; in caso contrario, 0.The number 1 if value is true; otherwise, 0.

Esempi

L'esempio seguente illustra la conversione di Boolean a Decimal valori.The following example illustrates the conversion of Boolean to Decimal values.

bool[] flags = { true, false };
decimal result;

foreach (bool flag in flags)
{
   result = Convert.ToDecimal(flag);
   Console.WriteLine("Converted {0} to {1}.", flag, result);
}
// The example displays the following output:
//       Converted True to 1.
//       Converted False to 0.      
Dim flags() As Boolean = { True, False }
Dim result As Decimal

For Each flag As Boolean In flags
   result = Convert.ToDecimal(flag)
   Console.WriteLine("Converted {0} to {1}.", flag, result)
Next
' The example displays the following output:
'       Converted True to 1.
'       Converted False to 0.      
Vedi anche

ToDecimal(Byte) ToDecimal(Byte) ToDecimal(Byte) ToDecimal(Byte)

Converte il valore dell'intero senza segno a 8 bit specificato nel numero decimale equivalente.Converts the value of the specified 8-bit unsigned integer to the equivalent decimal number.

public:
 static System::Decimal ToDecimal(System::Byte value);
public static decimal ToDecimal (byte value);
static member ToDecimal : byte -> decimal
Public Shared Function ToDecimal (value As Byte) As Decimal

Parametri

value
Byte Byte Byte Byte

Intero senza segno a 8 bit da convertire.The 8-bit unsigned integer to convert.

Restituisce

Numero decimale equivalente a value.The decimal number that is equivalent to value.

Esempi

L'esempio seguente converte un Byte valore per un Decimal valore.The following example converts a Byte value to a Decimal value.

public:
   void ConvertByteDecimal( Byte byteVal )
   {
      Decimal decimalVal;
      
      // Byte to decimal conversion will not overflow.
      decimalVal = System::Convert::ToDecimal( byteVal );
      System::Console::WriteLine( "The Byte as a decimal is {0}.",
         decimalVal );
      
      // Decimal to Byte conversion can overflow.
      try
      {
         byteVal = System::Convert::ToByte( decimalVal );
         System::Console::WriteLine( "The Decimal as a Byte is {0}.",
         byteVal );
      }
      catch ( System::OverflowException^ ) 
      {
         System::Console::WriteLine(
            "The decimal value is too large for a Byte." );
      }
   }
public void ConvertByteDecimal(byte byteVal) {
	decimal decimalVal;

	// Byte to decimal conversion will not overflow.
	decimalVal = System.Convert.ToDecimal(byteVal);
	System.Console.WriteLine("The byte as a decimal is {0}.",
		decimalVal);

	// Decimal to byte conversion can overflow.
	try {
		byteVal = System.Convert.ToByte(decimalVal);
		System.Console.WriteLine("The Decimal as a byte is {0}.",
			byteVal);
	}
	catch (System.OverflowException) {
		System.Console.WriteLine(
			"The decimal value is too large for a byte.");
	}
}
Public Sub ConvertByteDecimal(ByVal byteVal As Byte)
    Dim decimalVal As Decimal

    ' Byte to decimal conversion will not overflow.
    decimalVal = System.Convert.ToDecimal(byteVal)
    System.Console.WriteLine("The byte as a decimal is {0}.", _
                              decimalVal)

    ' Decimal to byte conversion can overflow.
    Try
        byteVal = System.Convert.ToByte(decimalVal)
        System.Console.WriteLine("The Decimal as a byte is {0}.", _
                                  byteVal)
    Catch exception As System.OverflowException
        System.Console.WriteLine( _
            "Overflow in decimal-to-byte conversion.")
    End Try
End Sub
Vedi anche

ToDecimal(Char) ToDecimal(Char) ToDecimal(Char) ToDecimal(Char)

La chiamata di questo metodo genera sempre un'eccezione InvalidCastException.Calling this method always throws InvalidCastException.

public:
 static System::Decimal ToDecimal(char value);
public static decimal ToDecimal (char value);
static member ToDecimal : char -> decimal
Public Shared Function ToDecimal (value As Char) As Decimal

Parametri

value
Char Char Char Char

Carattere Unicode da convertire.The Unicode character to convert.

Restituisce

Questa conversione non è supportata.This conversion is not supported. Non vengono restituiti valori.No value is returned.

Eccezioni

Questa conversione non è supportata.This conversion is not supported.

Esempi

Nell'esempio seguente tenta di convertire un Char valore per Decimale genera un'eccezione InvalidCastException in caso di errore.The following example attempts to convert a Char value to Decimal, and throws InvalidCastException upon failure.

public:
   void ConvertCharDecimal( Char charVal )
   {
      Decimal decimalVal = 0;
      
      // Char to decimal conversion is not supported and will always
      // throw an InvalidCastException.
      try
      {
         decimalVal = System::Convert::ToDecimal( charVal );
      }
      catch ( System::InvalidCastException^ ) 
      {
         System::Console::WriteLine(
            "Char-to-Decimal conversion is not supported by the .NET Framework." );
      }
      
      //Decimal to char conversion is also not supported.
      try
      {
         charVal = System::Convert::ToChar( decimalVal );
      }
      catch ( System::InvalidCastException^ ) 
      {
         System::Console::WriteLine(
            "Decimal-to-Char conversion is not supported by the .NET Framework." );
      }
   }
public void ConvertCharDecimal(char charVal) {
	Decimal decimalVal = 0;
	
	// Char to decimal conversion is not supported and will always
	// throw an InvalidCastException.
	try {
		decimalVal = System.Convert.ToDecimal(charVal);
	} 
	catch (System.InvalidCastException) {
		System.Console.WriteLine(
			"Char-to-Decimal conversion is not supported " +
			"by the .NET Framework.");
	}

	//Decimal to char conversion is also not supported.
	try {
		charVal = System.Convert.ToChar(decimalVal);
	} 
	catch (System.InvalidCastException) {
		System.Console.WriteLine(
			"Decimal-to-Char conversion is not supported " +
			"by the .NET Framework.");
	}
}
Public Sub ConvertCharDecimal(ByVal charVal As Char)
    Dim decimalVal As [Decimal] = 0

    ' Char to decimal conversion is not supported and will always
    ' throw an InvalidCastException.
    Try
        decimalVal = System.Convert.ToDecimal(charVal)
    Catch exception As System.InvalidCastException
        System.Console.WriteLine( _
             "Char-to-Decimal conversion is not supported " + _
             "by the .NET Framework.")
    End Try

    'Decimal to char conversion is also not supported.
    Try
        charVal = System.Convert.ToChar(decimalVal)
    Catch exception As System.InvalidCastException
        System.Console.WriteLine( _
            "Decimal-to-Char conversion is not supported " + _
            "by the .NET Framework.")
    End Try
End Sub
Vedi anche

ToDecimal(Int64) ToDecimal(Int64) ToDecimal(Int64) ToDecimal(Int64)

Converte il valore dell'intero con segno a 64 bit specificato in un numero decimale equivalente.Converts the value of the specified 64-bit signed integer to an equivalent decimal number.

public:
 static System::Decimal ToDecimal(long value);
public static decimal ToDecimal (long value);
static member ToDecimal : int64 -> decimal
Public Shared Function ToDecimal (value As Long) As Decimal

Parametri

value
Int64 Int64 Int64 Int64

Intero con segno a 64 bit da convertire.The 64-bit signed integer to convert.

Restituisce

Numero decimale equivalente a value.A decimal number that is equivalent to value.

Esempi

L'esempio seguente converte un' Int64 valore per un Decimal valore.The following example converts an Int64 value to a Decimal value.

public:
   void ConvertLongDecimal( Int64 longVal )
   {
      Decimal decimalVal;
      
      // Long to decimal conversion cannot overflow.
      decimalVal = System::Convert::ToDecimal( longVal );
      System::Console::WriteLine( " {0} as a decimal is {1}",
         longVal, decimalVal );
      
      // Decimal to long conversion can overflow.
      try
      {
         longVal = System::Convert::ToInt64( decimalVal );
         System::Console::WriteLine( " {0} as a long is {1}",
         decimalVal, longVal );
      }
      catch ( System::OverflowException^ ) 
      {
         System::Console::WriteLine( "Overflow in decimal-to-long conversion." );
      }
   }
public void ConvertLongDecimal(long longVal) {

	decimal	decimalVal;
	
	// Long to decimal conversion cannot overflow.
	decimalVal = System.Convert.ToDecimal(longVal);
	System.Console.WriteLine("{0} as a decimal is {1}", 
			longVal, decimalVal);

	// Decimal to long conversion can overflow.
	try {
		longVal = System.Convert.ToInt64(decimalVal);
		System.Console.WriteLine("{0} as a long is {1}", 
			decimalVal, longVal);
	}
	catch (System.OverflowException) {
		System.Console.WriteLine(
			"Overflow in decimal-to-long conversion.");
	}
}
Public Sub ConvertLongDecimal(ByVal longVal As Long)

    Dim decimalVal As Decimal

    'Long to Decimal conversion cannot overflow.
    decimalVal = System.Convert.ToDecimal(longVal)
    System.Console.WriteLine("{0} as a Decimal is {1}", _
                              longVal, decimalVal)

    'Decimal to Long conversion can overflow.
    Try
        longVal = System.Convert.ToInt64(decimalVal)
        System.Console.WriteLine("{0} as a Long is {1}", _
                                  decimalVal, longVal)
    Catch exception As System.OverflowException
        System.Console.WriteLine( _
            "Overflow in decimal-to-long conversion.")
    End Try
End Sub
Vedi anche

ToDecimal(Decimal) ToDecimal(Decimal) ToDecimal(Decimal) ToDecimal(Decimal)

Restituisce il numero decimale specificato; non viene eseguita alcuna conversione effettiva.Returns the specified decimal number; no actual conversion is performed.

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

Parametri

value
Decimal Decimal Decimal Decimal

Numero decimale.A decimal number.

Restituisce

value viene restituito invariato.value is returned unchanged.

ToDecimal(Double) ToDecimal(Double) ToDecimal(Double) ToDecimal(Double)

Converte il valore del numero a virgola mobile a precisione doppia specificato in un numero decimale equivalente.Converts the value of the specified double-precision floating-point number to an equivalent decimal number.

public:
 static System::Decimal ToDecimal(double value);
public static decimal ToDecimal (double value);
static member ToDecimal : double -> decimal
Public Shared Function ToDecimal (value As Double) As Decimal

Parametri

value
Double Double Double Double

Numero a virgola mobile a precisione doppia da convertire.The double-precision floating-point number to convert.

Restituisce

Numero decimale equivalente a value.A decimal number that is equivalent to value.

Eccezioni

value è maggiore di MaxValue o minore di MinValue.value is greater than MaxValue or less than MinValue.

Esempi

L'esempio seguente converte un Double valore per un Decimal valore.The following example converts a Double value to a Decimal value.

public:
   void ConvertDoubleDecimal( double doubleVal )
   {
      Decimal decimalVal;
      
      // Conversion from double to decimal cannot overflow.
      decimalVal = System::Convert::ToDecimal( doubleVal );
      System::Console::WriteLine( " {0} as a decimal is: {1}",
         doubleVal, decimalVal );
      
      // Decimal to double conversion can overflow.
      try
      {
         doubleVal = System::Convert::ToDouble( decimalVal );
         System::Console::WriteLine( " {0} as a double is: {1}",
         decimalVal, doubleVal );
      }
      catch ( System::OverflowException^ ) 
      {
         System::Console::WriteLine( "Overflow in decimal-to-double conversion." );
      }
   }
public void ConvertDoubleDecimal(decimal decimalVal){
	
	double doubleVal;
	
	// Decimal to double conversion cannot overflow.
       doubleVal = System.Convert.ToDouble(decimalVal);
	System.Console.WriteLine("{0} as a double is: {1}",
			decimalVal, doubleVal);

	// Conversion from double to decimal can overflow.
	try 
       {
	   decimalVal = System.Convert.ToDecimal(doubleVal);
 			System.Console.WriteLine ("{0} as a decimal is: {1}",
  			doubleVal, decimalVal);
	} 
	catch (System.OverflowException) {
		System.Console.WriteLine(
			"Overflow in double-to-double conversion.");
	}
	

}
Public Sub ConvertDoubleDecimal(ByVal decimalVal As Decimal)

    Dim doubleVal As Double

    ' Decimal to Double conversion cannot overflow.
    doubleVal = System.Convert.ToDouble(decimalVal)
    System.Console.WriteLine("{0} as a Double is: {1}", _
                             decimalVal, doubleVal)
    
    ' Conversion from Double to Decimal can overflow.
    Try
       decimalVal = System.Convert.ToDecimal(doubleVal)
       System.Console.WriteLine("{0} as a Decimal is: {1}", _
                                doubleVal, decimalVal)
    Catch exception As System.OverflowException
        System.Console.WriteLine( _
            "Overflow in Double-to-Decimal conversion.")
    End Try

End Sub

Commenti

Il Decimal valore restituito da questo metodo contiene un massimo di 15 cifre significative.The Decimal value returned by this method contains a maximum of 15 significant digits. Se il value parametro contiene più di 15 cifre significative, il valore viene arrotondato al valore più vicino.If the value parameter contains more than 15 significant digits, it is rounded using rounding to nearest. Nell'esempio seguente viene illustrato come la Convert.ToDecimal(Double) metodo Usa l'arrotondamento al più vicino a restituire un Decimal valore con 15 cifre significative.The following example illustrates how the Convert.ToDecimal(Double) method uses rounding to nearest to return a Decimal value with 15 significant digits.

Console.WriteLine(Convert.ToDecimal(123456789012345500.12D));  // Displays 123456789012346000
Console.WriteLine(Convert.ToDecimal(123456789012346500.12D));  // Displays 123456789012346000

Console.WriteLine(Convert.ToDecimal(10030.12345678905D));      // Displays 10030.123456789 
Console.WriteLine(Convert.ToDecimal(10030.12345678915D));      // Displays 10030.1234567892
Console.WriteLine(Convert.ToDecimal(123456789012345500.12R))   ' Displays 123456789012346000
Console.WriteLine(Convert.ToDecimal(123456789012346500.12R))   ' Displays 123456789012346000

Console.WriteLine(Convert.ToDecimal(10030.12345678905R))       ' Displays 10030.123456789 
Console.WriteLine(Convert.ToDecimal(10030.12345678915R))       ' Displays 10030.1234567892
Vedi anche

ToDecimal(Int16) ToDecimal(Int16) ToDecimal(Int16) ToDecimal(Int16)

Converte il valore dell'intero con segno a 16 bit specificato in un numero decimale equivalente.Converts the value of the specified 16-bit signed integer to an equivalent decimal number.

public:
 static System::Decimal ToDecimal(short value);
public static decimal ToDecimal (short value);
static member ToDecimal : int16 -> decimal
Public Shared Function ToDecimal (value As Short) As Decimal

Parametri

value
Int16 Int16 Int16 Int16

Intero con segno a 16 bit da convertire.The 16-bit signed integer to convert.

Restituisce

Numero decimale equivalente a value.A decimal number that is equivalent to value.

Esempi

Nell'esempio seguente converte una matrice di interi con segno a 16 bit a Decimal valori.The following example converts an array of 16-bit signed integers to Decimal values.

short[] numbers = { Int16.MinValue, -1000, 0, 1000, Int16.MaxValue };
decimal result;

foreach (short number in numbers)
{
   result = Convert.ToDecimal(number);
   Console.WriteLine("Converted the Int16 value {0} to the Decimal value {1}.",
                     number, result);
}
// The example displays the following output:
//       Converted the Int16 value -32768 to the Decimal value -32768.
//       Converted the Int16 value -1000 to the Decimal value -1000.
//       Converted the Int16 value 0 to the Decimal value 0.
//       Converted the Int16 value 1000 to the Decimal value 1000.
//       Converted the Int16 value 32767 to the Decimal value 32767.
Dim numbers() As Short = { Int16.MinValue, -1000, 0, 1000, Int16.MaxValue }
Dim result As Decimal

For Each number As Short In numbers
   result = Convert.ToDecimal(number)
   Console.WriteLine("Converted the Int16 value {0} to the Decimal value {1}.", _
                     number, result)
Next
' The example displays the following output:
'       Converted the Int16 value -32768 to the Decimal value -32768.
'       Converted the Int16 value -1000 to the Decimal value -1000.
'       Converted the Int16 value 0 to the Decimal value 0.
'       Converted the Int16 value 1000 to the Decimal value 1000.
'       Converted the Int16 value 32767 to the Decimal value 32767.
Vedi anche

ToDecimal(DateTime) ToDecimal(DateTime) ToDecimal(DateTime) ToDecimal(DateTime)

La chiamata di questo metodo genera sempre un'eccezione InvalidCastException.Calling this method always throws InvalidCastException.

public:
 static System::Decimal ToDecimal(DateTime value);
public static decimal ToDecimal (DateTime value);
static member ToDecimal : DateTime -> decimal
Public Shared Function ToDecimal (value As DateTime) As Decimal

Parametri

value
DateTime DateTime DateTime DateTime

Valore di data e ora da convertire.The date and time value to convert.

Restituisce

Questa conversione non è supportata.This conversion is not supported. Non vengono restituiti valori.No value is returned.

Eccezioni

Questa conversione non è supportata.This conversion is not supported.

Si applica a