Convert.ToSingle Convert.ToSingle Convert.ToSingle Convert.ToSingle Method

Definizione

Converte un valore specificato in un numero a virgola mobile a precisione singola.Converts a specified value to a single-precision floating-point number.

Overload

ToSingle(String, IFormatProvider) ToSingle(String, IFormatProvider) ToSingle(String, IFormatProvider) ToSingle(String, IFormatProvider)

Converte la rappresentazione di stringa specificata di un numero in un numero a virgola mobile a precisione singola equivalente mediante le informazioni di formattazione specifiche delle impostazioni cultura indicate.Converts the specified string representation of a number to an equivalent single-precision floating-point number, using the specified culture-specific formatting information.

ToSingle(SByte) ToSingle(SByte) ToSingle(SByte) ToSingle(SByte)

Converte il valore dell'intero con segno a 8 bit specificato nel numero a virgola mobile a precisione singola equivalente.Converts the value of the specified 8-bit signed integer to the equivalent single-precision floating-point number.

ToSingle(Object, IFormatProvider) ToSingle(Object, IFormatProvider) ToSingle(Object, IFormatProvider) ToSingle(Object, IFormatProvider)

Converte il valore dell'oggetto specificato in un numero a virgola mobile a precisione singola mediante le informazioni di formattazione specifiche delle impostazioni cultura indicate.Converts the value of the specified object to an single-precision floating-point number, using the specified culture-specific formatting information.

ToSingle(UInt64) ToSingle(UInt64) ToSingle(UInt64) ToSingle(UInt64)

Converte il valore dell'intero senza segno a 64 bit specificato in un numero a virgola mobile a precisione singola equivalente.Converts the value of the specified 64-bit unsigned integer to an equivalent single-precision floating-point number.

ToSingle(UInt32) ToSingle(UInt32) ToSingle(UInt32) ToSingle(UInt32)

Converte il valore dell'intero senza segno a 32 bit specificato in un numero a virgola mobile a precisione singola equivalente.Converts the value of the specified 32-bit unsigned integer to an equivalent single-precision floating-point number.

ToSingle(String) ToSingle(String) ToSingle(String) ToSingle(String)

Converte la rappresentazione di stringa specificata di un numero in un numero a virgola mobile e con precisione singola equivalente.Converts the specified string representation of a number to an equivalent single-precision floating-point number.

ToSingle(Single) ToSingle(Single) ToSingle(Single) ToSingle(Single)

Restituisce il numero a virgola mobile e con precisione singola specificato; non viene eseguita alcuna conversione effettiva.Returns the specified single-precision floating-point number; no actual conversion is performed.

ToSingle(Object) ToSingle(Object) ToSingle(Object) ToSingle(Object)

Converte il valore dell'oggetto specificato in un numero a virgola mobile a precisione singola.Converts the value of the specified object to a single-precision floating-point number.

ToSingle(UInt16) ToSingle(UInt16) ToSingle(UInt16) ToSingle(UInt16)

Converte il valore dell'intero senza segno a 16 bit specificato nel numero a virgola mobile a precisione singola equivalente.Converts the value of the specified 16-bit unsigned integer to the equivalent single-precision floating-point number.

ToSingle(Int32) ToSingle(Int32) ToSingle(Int32) ToSingle(Int32)

Converte il valore dell'intero con segno a 32 bit specificato in un numero a virgola mobile e con precisione singola equivalente.Converts the value of the specified 32-bit signed integer to an equivalent single-precision floating-point number.

ToSingle(Int16) ToSingle(Int16) ToSingle(Int16) ToSingle(Int16)

Converte il valore dell'intero con segno a 16 bit specificato in un numero a virgola mobile e con precisione singola equivalente.Converts the value of the specified 16-bit signed integer to an equivalent single-precision floating-point number.

ToSingle(Double) ToSingle(Double) ToSingle(Double) ToSingle(Double)

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

ToSingle(Decimal) ToSingle(Decimal) ToSingle(Decimal) ToSingle(Decimal)

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

ToSingle(DateTime) ToSingle(DateTime) ToSingle(DateTime) ToSingle(DateTime)

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

ToSingle(Char) ToSingle(Char) ToSingle(Char) ToSingle(Char)

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

ToSingle(Byte) ToSingle(Byte) ToSingle(Byte) ToSingle(Byte)

Converte il valore dell'intero senza segno a 8 bit specificato nel numero a virgola mobile a precisione singola equivalente.Converts the value of the specified 8-bit unsigned integer to the equivalent single-precision floating-point number.

ToSingle(Boolean) ToSingle(Boolean) ToSingle(Boolean) ToSingle(Boolean)

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

ToSingle(Int64) ToSingle(Int64) ToSingle(Int64) ToSingle(Int64)

Converte il valore dell'intero con segno a 64 bit specificato in un numero a virgola mobile a precisione singola equivalente.Converts the value of the specified 64-bit signed integer to an equivalent single-precision floating-point number.

ToSingle(String, IFormatProvider) ToSingle(String, IFormatProvider) ToSingle(String, IFormatProvider) ToSingle(String, IFormatProvider)

Converte la rappresentazione di stringa specificata di un numero in un numero a virgola mobile a precisione singola equivalente mediante le informazioni di formattazione specifiche delle impostazioni cultura indicate.Converts the specified string representation of a number to an equivalent single-precision floating-point number, using the specified culture-specific formatting information.

public:
 static float ToSingle(System::String ^ value, IFormatProvider ^ provider);
public static float ToSingle (string value, IFormatProvider provider);
static member ToSingle : string * IFormatProvider -> single
Public Shared Function ToSingle (value As String, provider As IFormatProvider) As Single

Parametri

value
String String String String

Stringa che contiene il numero da convertire.A string that contains the 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 a virgola mobile e con precisione singola equivalente al numero in value oppure 0 (zero) se value è null.A single-precision floating-point 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 vengono IFormatProvider usati gli oggetti che rappresentano le impostazioni cultura en-US e fr-FR quando converte gli elementi di una matrice di Single stringhe numeriche in valori.The following example uses IFormatProvider objects that represent the en-US and fr-FR cultures when it converts the elements in an array of numeric strings to Single values.

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", "1.235e12", "1.03221e-05", 
                          Double.MaxValue.ToString() };
      CultureInfo[] cultures = { new CultureInfo("en-US"),
                                 new CultureInfo("fr-FR") }; 

      foreach (CultureInfo culture in cultures)
      {
         Console.WriteLine("String -> Single Conversion Using the {0} Culture",
                           culture.Name);
         foreach (string value in values)
         {
            Console.Write("{0,22}  ->  ", value);
            try {
               Console.WriteLine(Convert.ToSingle(value, culture));
            }
            catch (FormatException) {
               Console.WriteLine("FormatException");
            }
            catch (OverflowException) {
               Console.WriteLine("OverflowException");
            }
         }
         Console.WriteLine();
      }                     
   }
}
// The example displays the following output:
//    String -> Single Conversion Using the en-US Culture
//                 123456789  ->  1.234568E+08
//                12345.6789  ->  12345.68
//               12 345,6789  ->  FormatException
//               123,456.789  ->  123456.8
//               123 456,789  ->  FormatException
//          123,456,789.0123  ->  1.234568E+08
//          123 456 789,0123  ->  FormatException
//                  1.235e12  ->  1.235E+12
//               1.03221e-05  ->  1.03221E-05
//     1.79769313486232E+308  ->  Overflow
//    
//    String -> Single Conversion Using the fr-FR Culture
//                 123456789  ->  1.234568E+08
//                12345.6789  ->  FormatException
//               12 345,6789  ->  12345.68
//               123,456.789  ->  FormatException
//               123 456,789  ->  123456.8
//          123,456,789.0123  ->  FormatException
//          123 456 789,0123  ->  1.234568E+08
//                  1.235e12  ->  FormatException
//               1.03221e-05  ->  FormatException
//     1.79769313486232E+308  ->  FormatException
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", "1.235e12", "1.03221e-05", _
                                 Double.MaxValue.ToString() }
      Dim cultures() As CultureInfo = { New CultureInfo("en-US"), _
                                        New CultureInfo("fr-FR") } 

      For Each culture As CultureInfo In cultures
         Console.WriteLine("String -> Single Conversion Using the {0} Culture", _
                           culture.Name)
         For Each value As String In values
            Console.Write("{0,22}  ->  ", value)
            Try
               Console.WriteLine(Convert.ToSingle(value, culture))
            Catch e As FormatException
               Console.WriteLine("FormatException")
            CAtch e As OverflowException
               Console.WriteLine("Overflow")
            End Try   
         Next
         Console.WriteLine()
      Next                     
   End Sub
End Module
' The example displays the following output:
'    String -> Single Conversion Using the en-US Culture
'                 123456789  ->  1.234568E+08
'                12345.6789  ->  12345.68
'               12 345,6789  ->  FormatException
'               123,456.789  ->  123456.8
'               123 456,789  ->  FormatException
'          123,456,789.0123  ->  1.234568E+08
'          123 456 789,0123  ->  FormatException
'                  1.235e12  ->  1.235E+12
'               1.03221e-05  ->  1.03221E-05
'     1.79769313486232E+308  ->  Overflow
'    
'    String -> Single Conversion Using the fr-FR Culture
'                 123456789  ->  1.234568E+08
'                12345.6789  ->  FormatException
'               12 345,6789  ->  12345.68
'               123,456.789  ->  FormatException
'               123 456,789  ->  123456.8
'          123,456,789.0123  ->  FormatException
'          123 456 789,0123  ->  1.234568E+08
'                  1.235e12  ->  FormatException
'               1.03221e-05  ->  FormatException
'     1.79769313486232E+308  ->  FormatException

Commenti

Il valore restituito è il risultato della chiamata al Single.Parse metodo su. valueThe return value is the result of invoking the Single.Parse method on value.

providerè un' IFormatProvider istanza di che ottiene un NumberFormatInfo oggetto.provider is an IFormatProvider instance that obtains a NumberFormatInfo object. L' NumberFormatInfo oggetto fornisce informazioni specifiche delle impostazioni cultura relative al formato valuedi.The NumberFormatInfo object provides culture-specific information about the format of value. Se provider NumberFormatInfo è null, viene utilizzato l'oggetto per le impostazioni cultura correnti.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 invece possibile chiamare Single.TryParse il metodo.If you prefer not to handle an exception if the conversion fails, you can call the Single.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.

ToSingle(SByte) ToSingle(SByte) ToSingle(SByte) ToSingle(SByte)

Importante

Questa API non è conforme a CLS.

Converte il valore dell'intero con segno a 8 bit specificato nel numero a virgola mobile a precisione singola equivalente.Converts the value of the specified 8-bit signed integer to the equivalent single-precision floating-point number.

public:
 static float ToSingle(System::SByte value);
[System.CLSCompliant(false)]
public static float ToSingle (sbyte value);
static member ToSingle : sbyte -> single
Public Shared Function ToSingle (value As SByte) As Single

Parametri

value
SByte SByte SByte SByte

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

Restituisce

Intero con segno a 8 bit equivalente a value.An 8-bit signed integer that is equivalent to value.

Esempi

Nell'esempio seguente ogni elemento di una matrice di byte con segno viene Single convertito in un valore.The following example converts each element in a signed byte array to a Single value.

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

foreach (sbyte number in numbers)
{
   result = Convert.ToSingle(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 Single value -128.
//    Converted the SByte value '-23' to the Single value -23.
//    Converted the SByte value '0' to the Single value 0.
//    Converted the SByte value '17' to the Single value 17.
//    Converted the SByte value '127' to the Single value 127.
Dim numbers() As SByte = { SByte.MinValue, -23, 0, 17, SByte.MaxValue }
Dim result As Single

For Each number As SByte In numbers
   result = Convert.ToSingle(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 Single value -128.
'    Converted the SByte value '-23' to the Single value -23.
'    Converted the SByte value '0' to the Single value 0.
'    Converted the SByte value '17' to the Single value 17.
'    Converted the SByte value '127' to the Single value 127.

ToSingle(Object, IFormatProvider) ToSingle(Object, IFormatProvider) ToSingle(Object, IFormatProvider) ToSingle(Object, IFormatProvider)

Converte il valore dell'oggetto specificato in un numero a virgola mobile a precisione singola mediante le informazioni di formattazione specifiche delle impostazioni cultura indicate.Converts the value of the specified object to an single-precision floating-point number, using the specified culture-specific formatting information.

public:
 static float ToSingle(System::Object ^ value, IFormatProvider ^ provider);
public static float ToSingle (object value, IFormatProvider provider);
static member ToSingle : obj * IFormatProvider -> single
Public Shared Function ToSingle (value As Object, provider As IFormatProvider) As Single

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 a virgola mobile e con precisione singola equivalente a value oppure zero se value è null.A single-precision floating-point number that is equivalent to value, or zero if value is null.

Eccezioni

Il formato di value non è appropriato.value is not in an appropriate 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 definita una classe Temperature che implementa l'interfaccia IConvertible .The following example defines a Temperature class that implements the IConvertible interface. La relativa implementazione del IConvertible.ToSingle metodo restituisce il valore interno di una variabile Single privata che rappresenta la temperatura.Its implementation of the IConvertible.ToSingle method returns the internal value of a private Single variable that represents the temperature.

using System;
using System.Globalization;

public class Temperature : IConvertible
{
   private float m_Temp;

   public Temperature(float temperature)
   {
      this.m_Temp = temperature;
   }
   
   public float Celsius
   {
      get { return this.m_Temp; }   
   }
   
   public float Kelvin
   {
      get { return this.m_Temp + 273.15f; }    
   }
   
   public float Fahrenheit
   {
      get { return (float) Math.Round(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 Convert.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 Convert.ToDecimal(this.m_Temp);
   }
   
   public double ToDouble(IFormatProvider provider)
   {
      return Convert.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 Convert.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 Convert.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 Convert.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 Convert.ToSByte(this.m_Temp);
   }

   public float ToSingle(IFormatProvider provider)
   {
      return 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 Convert.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 Convert.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 Convert.ToUInt64(this.m_Temp);
   }
}
Imports System.Globalization

Public Class Temperature : Implements IConvertible
   Private m_Temp As Single

   Public Sub New(temperature As Single)
      Me.m_Temp = temperature
   End Sub
   
   Public ReadOnly Property Celsius() As Single
      Get
         Return Me.m_Temp
      End Get   
   End Property
   
   Public ReadOnly Property Kelvin() As Single
      Get
         Return Me.m_Temp + 273.15F
      End Get
   End Property
   
   Public ReadOnly Property Fahrenheit() As Single
      Get
         Return CSng(Math.Round(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 Convert.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 Convert.ToDecimal(Me.m_Temp)
   End Function
   
   Public Function ToDouble(provider As IFormatProvider) As Double _
                   Implements IConvertible.ToDouble
      Return Convert.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 Convert.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 Convert.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 Convert.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 Convert.ToSByte(Me.m_Temp)
      End If      
   End Function

   Public Function ToSingle(provider As IFormatProvider) As Single _
                   Implements IConvertible.ToSingle
      Return 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 Convert.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 Convert.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 Convert.ToUInt64(Me.m_temp)
      End If   
   End Function
End Class

Nell'esempio seguente viene illustrato il modo in cui una Convert.ToSingle(Object, IFormatProvider) chiamata al metodo, a sua volta IConvertible.ToSingle , chiama l' Temperature implementazione della classe.The following example illustrates how a call to the Convert.ToSingle(Object, IFormatProvider) method, in turn, calls the IConvertible.ToSingle implementation of the Temperature class.

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.ToInt32(cold, null));
      Console.WriteLine(Convert.ToInt32(freezing, null));
      Console.WriteLine(Convert.ToDouble(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.ToInt32(cold, Nothing))
      Console.WriteLine(Convert.ToInt32(freezing, Nothing))
      Console.WriteLine(Convert.ToDouble(boiling, Nothing))
   End Sub
End Module
' The example displays the following output:
'       -40
'       0
'       100

Commenti

Il valore restituito è il risultato della chiamata al IConvertible.ToSingle metodo del tipo sottostante di. valueThe return value is the result of invoking the IConvertible.ToSingle method of the underlying type of value.

providerconsente all'utente di specificare le informazioni relative alla conversione specifiche delle impostazioni cultura valuerelative al contenuto di.provider enables the user to specify culture-specific conversion information about the contents of value. Se value , ad esempio, è String un oggetto che rappresenta un provider numero, può fornire informazioni specifiche delle impostazioni cultura relative alla notazione utilizzata per rappresentare tale numero.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.

I tipi di base providerignorano; tuttavia, il parametro può essere value usato se è un tipo definito dall'utente che IConvertible implementa l'interfaccia.The base types ignore provider; however, the parameter may be used if value is a user-defined type that implements the IConvertible interface.

ToSingle(UInt64) ToSingle(UInt64) ToSingle(UInt64) ToSingle(UInt64)

Importante

Questa API non è conforme a CLS.

Converte il valore dell'intero senza segno a 64 bit specificato in un numero a virgola mobile a precisione singola equivalente.Converts the value of the specified 64-bit unsigned integer to an equivalent single-precision floating-point number.

public:
 static float ToSingle(System::UInt64 value);
[System.CLSCompliant(false)]
public static float ToSingle (ulong value);
static member ToSingle : uint64 -> single
Public Shared Function ToSingle (value As ULong) As Single

Parametri

value
UInt64 UInt64 UInt64 UInt64

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

Restituisce

Numero a virgola mobile e con precisione singola equivalente a value.A single-precision floating-point number that is equivalent to value.

Esempi

Nell'esempio seguente ogni elemento di una matrice di interi senza segno viene convertito in un Single valore.The following example converts each element in an array of unsigned long integers to a Single value.

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

foreach (ulong number in numbers)
{
   result = Convert.ToSingle(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 UInt64 value '0' to the Single value 0.
//    Converted the UInt64 value '121' to the Single value 121.
//    Converted the UInt64 value '12345' to the Single value 12345.
//    Converted the UInt64 value '18446744073709551615' to the Single value 1.844674E+19.
Dim numbers() As ULong = { UInt64.MinValue, 121, 12345, UInt64.MaxValue }
Dim result As Single

For Each number As ULong In numbers
   result = Convert.ToSingle(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 UInt64 value '0' to the Single value 0.
'    Converted the UInt64 value '121' to the Single value 121.
'    Converted the UInt64 value '12345' to the Single value 12345.
'    Converted the UInt64 value '18446744073709551615' to the Single value 1.844674E+19.

ToSingle(UInt32) ToSingle(UInt32) ToSingle(UInt32) ToSingle(UInt32)

Importante

Questa API non è conforme a CLS.

Converte il valore dell'intero senza segno a 32 bit specificato in un numero a virgola mobile a precisione singola equivalente.Converts the value of the specified 32-bit unsigned integer to an equivalent single-precision floating-point number.

public:
 static float ToSingle(System::UInt32 value);
[System.CLSCompliant(false)]
public static float ToSingle (uint value);
static member ToSingle : uint32 -> single
Public Shared Function ToSingle (value As UInteger) As Single

Parametri

value
UInt32 UInt32 UInt32 UInt32

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

Restituisce

Numero a virgola mobile e con precisione singola equivalente a value.A single-precision floating-point number that is equivalent to value.

Esempi

Nell'esempio seguente ogni elemento di una matrice di interi senza segno viene convertito in un Single valore.The following example converts each element in an array of unsigned integers to a Single value.

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

foreach (uint number in numbers)
{
   result = Convert.ToSingle(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 UInt32 value '0' to the Single value 0.
//    Converted the UInt32 value '121' to the Single value 121.
//    Converted the UInt32 value '12345' to the Single value 12345.
//    Converted the UInt32 value '4294967295' to the Single value 4.294967E+09.
   Dim numbers() As UInteger = { UInt32.MinValue, 121, 12345, UInt32.MaxValue }
   Dim result As Single
   
   For Each number As UInteger In numbers
      result = Convert.ToSingle(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 UInt32 value '0' to the Single value 0.
'    Converted the UInt32 value '121' to the Single value 121.
'    Converted the UInt32 value '12345' to the Single value 12345.
'    Converted the UInt32 value '4294967295' to the Single value 4.294967E+09.

ToSingle(String) ToSingle(String) ToSingle(String) ToSingle(String)

Converte la rappresentazione di stringa specificata di un numero in un numero a virgola mobile e con precisione singola equivalente.Converts the specified string representation of a number to an equivalent single-precision floating-point number.

public:
 static float ToSingle(System::String ^ value);
public static float ToSingle (string value);
static member ToSingle : string -> single
Public Shared Function ToSingle (value As String) As Single

Parametri

value
String String String String

Stringa che contiene il numero da convertire.A string that contains the number to convert.

Restituisce

Numero a virgola mobile e con precisione singola equivalente al numero in value oppure 0 (zero) se value è null.A single-precision floating-point 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 effettuato un tentativo di convertire ogni elemento in una matrice di stringhe Single numeriche in un valore.The following example attempts to convert each element in an array of numeric strings to a Single value.

string[] values= { "-1,035.77219", "1AFF", "1e-35", "1.63f",
                   "1,635,592,999,999,999,999,999,999", "-17.455", 
                   "190.34001", "1.29e325"};
float result;

foreach (string value in values)
{
   try {
      result = Convert.ToSingle(value);
      Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.", 
                        value.GetType().Name, value, 
                        result.GetType().Name, result);
   }   
   catch (FormatException) {
      Console.WriteLine("Unable to convert '{0}' to a Single.", value);
   }               
   catch (OverflowException) {
      Console.WriteLine("'{0}' is outside the range of a Single.", value);
   }
}       
// The example displays the following output:
//    Converted the String value '-1,035.77219' to the Single value -1035.772.
//    Unable to convert '1AFF' to a Single.
//    Converted the String value '1e-35' to the Single value 1E-35.
//    Unable to convert '1.63f' to a Single.
//    Converted the String value '1,635,592,999,999,999,999,999,999' to the Single value 1.635593E+24.
//    Converted the String value '-17.455' to the Single value -17.455.
//    Converted the String value '190.34001' to the Single value 190.34.
//    1.29e325' is outside the range of a Single.
Dim values() As String = { "-1,035.77219", "1AFF", "1e-35", "1.63f",
                           "1,635,592,999,999,999,999,999,999", "-17.455",
                           "190.34001", "1.29e325"}
Dim result As Single

For Each value As String In values
   Try
      result = Convert.ToSingle(value)
      Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.",
                        value.GetType().Name, value, _
                        result.GetType().Name, result)
   Catch e As FormatException
      Console.WriteLine("Unable to convert '{0}' to a Single.", value)            
   Catch e As OverflowException
      Console.WriteLine("'{0}' is outside the range of a Single.", value)
   End Try
Next       
' The example displays the following output:
'    Converted the String value '-1,035.77219' to the Single value -1035.772.
'    Unable to convert '1AFF' to a Single.
'    Converted the String value '1e-35' to the Single value 1E-35.
'    Unable to convert '1.63f' to a Single.
'    Converted the String value '1,635,592,999,999,999,999,999,999' to the Single value 1.635593E+24.
'    Converted the String value '-17.455' to the Single value -17.455.
'    Converted the String value '190.34001' to the Single value 190.34.
'    '1.29e325' is outside the range of a Single.

Commenti

L'utilizzo ToSingle(String) del metodo equivale al passaggio value al Single.Parse(String) metodo.Using the ToSingle(String) method is equivalent to passing value to the Single.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 invece possibile chiamare Single.TryParse il metodo.If you prefer not to handle an exception if the conversion fails, you can call the Single.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.

ToSingle(Single) ToSingle(Single) ToSingle(Single) ToSingle(Single)

Restituisce il numero a virgola mobile e con precisione singola specificato; non viene eseguita alcuna conversione effettiva.Returns the specified single-precision floating-point number; no actual conversion is performed.

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

Parametri

value
Single Single Single Single

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

Restituisce

value viene restituito invariato.value is returned unchanged.

Vedi anche

ToSingle(Object) ToSingle(Object) ToSingle(Object) ToSingle(Object)

Converte il valore dell'oggetto specificato in un numero a virgola mobile a precisione singola.Converts the value of the specified object to a single-precision floating-point number.

public:
 static float ToSingle(System::Object ^ value);
public static float ToSingle (object value);
static member ToSingle : obj -> single
Public Shared Function ToSingle (value As Object) As Single

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 a virgola mobile e con precisione singola equivalente a value oppure zero se value è null.A single-precision floating-point number that is equivalent to value, or zero if value is null.

Eccezioni

Il formato di value non è appropriato.value is not in an appropriate format.

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 effettuato un tentativo di convertire ogni elemento in una matrice Single di oggetti in un valore.The following example attempts to convert each element in an object array to a Single value.

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

foreach (object value in values)
{
   try {
      result = Convert.ToSingle(value);
      Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.", 
                        value.GetType().Name, value, 
                        result.GetType().Name, result);
   }
   catch (FormatException) {
      Console.WriteLine("The {0} value {1} is not recognized as a valid Single value.",
                        value.GetType().Name, value);
   }                     
   catch (OverflowException) {
      Console.WriteLine("The {0} value {1} is outside the range of the Single type.",
                        value.GetType().Name, value);
   }
   catch (InvalidCastException) {
      Console.WriteLine("Conversion of the {0} value {1} to a Single is not supported.",
                        value.GetType().Name, value);
   }                     
}
// The example displays the following output:
//    Converted the Boolean value 'True' to the Single value 1.
//    Conversion of the Char value a to a Single is not supported.
//    Converted the Int32 value '123' to the Single value 123.
//    Converted the Double value '1.764E+32' to the Single value 1.764E+32.
//    Converted the String value '9.78' to the Single value 9.78.
//    Converted the String value '1e-02' to the Single value 0.01.
//    Converted the Double value '1670' to the Single value 1670.
//    The String value A100 is not recognized as a valid Single value.
//    Converted the String value '1,033.67' to the Single value 1033.67.
//    Conversion of the DateTime value 11/7/2008 08:02:35 AM to a Single is not supported.
//    Converted the Decimal value '79228162514264337593543950335' to the Single value 7.922816E+28.
Dim values() As Object = { True, "a"c, 123, 1.764e32, "9.78", "1e-02", _
                           1.67e03, "A100", "1,033.67", Date.Now, _
                           Decimal.MaxValue }   
Dim result As Single

For Each value As Object In values
   Try
      result = Convert.ToSingle(value)
      Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.", _
                        value.GetType().Name, value, _
                        result.GetType().Name, result)

   Catch e As FormatException
      Console.WriteLine("The {0} value {1} is not recognized as a valid Single value.", _
                        value.GetType().Name, value)
   Catch e As OverflowException
      Console.WriteLine("The {0} value {1} is outside the range of the Single type.", _
                        value.GetType().Name, value)
   
   Catch e As InvalidCastException
      Console.WriteLine("Conversion of the {0} value {1} to a Single is not supported.", _
                        value.GetType().Name, value)
   End Try                     
Next
' The example displays the following output:
'    Converted the Boolean value 'True' to the Single value 1.
'    Conversion of the Char value a to a Single is not supported.
'    Converted the Int32 value '123' to the Single value 123.
'    Converted the Double value '1.764E+32' to the Single value 1.764E+32.
'    Converted the String value '9.78' to the Single value 9.78.
'    Converted the String value '1e-02' to the Single value 0.01.
'    Converted the Double value '1670' to the Single value 1670.
'    The String value A100 is not recognized as a valid Single value.
'    Converted the String value '1,033.67' to the Single value 1033.67.
'    Conversion of the DateTime value 11/7/2008 07:56:24 AM to a Single is not supported.
'    Converted the Decimal value '79228162514264337593543950335' to the Single value 7.922816E+28.

Commenti

Il valore restituito è il risultato della chiamata al IConvertible.ToSingle metodo del tipo sottostante di. valueThe return value is the result of invoking the IConvertible.ToSingle method of the underlying type of value.

ToSingle(UInt16) ToSingle(UInt16) ToSingle(UInt16) ToSingle(UInt16)

Importante

Questa API non è conforme a CLS.

Converte il valore dell'intero senza segno a 16 bit specificato nel numero a virgola mobile a precisione singola equivalente.Converts the value of the specified 16-bit unsigned integer to the equivalent single-precision floating-point number.

public:
 static float ToSingle(System::UInt16 value);
[System.CLSCompliant(false)]
public static float ToSingle (ushort value);
static member ToSingle : uint16 -> single
Public Shared Function ToSingle (value As UShort) As Single

Parametri

value
UInt16 UInt16 UInt16 UInt16

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

Restituisce

Numero a virgola mobile e con precisione singola equivalente a value.A single-precision floating-point number that is equivalent to value.

Esempi

Nell'esempio seguente ogni elemento di una matrice di interi senza segno a 16 bit viene convertito in un Single valore.The following example converts each element in an array of unsigned 16-bit integers to a Single value.

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

foreach (ushort number in numbers)
{
   result = Convert.ToSingle(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 UInt16 value '0' to the Single value 0.
//    Converted the UInt16 value '121' to the Single value 121.
//    Converted the UInt16 value '12345' to the Single value 12345.
//    Converted the UInt16 value '65535' to the Single value 65535.
Dim numbers() As UShort = { UInt16.MinValue, 121, 12345, UInt16.MaxValue }
Dim result As Single

For Each number As UShort In numbers
   result = Convert.ToSingle(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 UInt16 value '0' to the Single value 0.
'    Converted the UInt16 value '121' to the Single value 121.
'    Converted the UInt16 value '12345' to the Single value 12345.
'    Converted the UInt16 value '65535' to the Single value 65535.

ToSingle(Int32) ToSingle(Int32) ToSingle(Int32) ToSingle(Int32)

Converte il valore dell'intero con segno a 32 bit specificato in un numero a virgola mobile e con precisione singola equivalente.Converts the value of the specified 32-bit signed integer to an equivalent single-precision floating-point number.

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

Parametri

value
Int32 Int32 Int32 Int32

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

Restituisce

Numero a virgola mobile e con precisione singola equivalente a value.A single-precision floating-point number that is equivalent to value.

Esempi

Nell'esempio seguente ogni elemento di una matrice di interi viene Single convertito in un valore.The following example converts each element in an integer array to a Single value.

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

foreach (int number in numbers)
{
   result = Convert.ToSingle(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 Int32 value '-2147483648' to the Single value -2.147484E+09.
//    Converted the Int32 value '-1000' to the Single value -1000.
//    Converted the Int32 value '0' to the Single value 0.
//    Converted the Int32 value '1000' to the Single value 1000.
//    Converted the Int32 value '2147483647' to the Single value 2.147484E+09.
Dim numbers() As Integer = { Int32.MinValue, -1000, 0, 1000, Int32.MaxValue }
Dim result As Single

For Each number As Integer In numbers
   result = Convert.ToSingle(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 Int32 value '-2147483648' to the Single value -2.147484E+09.
'    Converted the Int32 value '-1000' to the Single value -1000.
'    Converted the Int32 value '0' to the Single value 0.
'    Converted the Int32 value '1000' to the Single value 1000.
'    Converted the Int32 value '2147483647' to the Single value 2.147484E+09.

ToSingle(Int16) ToSingle(Int16) ToSingle(Int16) ToSingle(Int16)

Converte il valore dell'intero con segno a 16 bit specificato in un numero a virgola mobile e con precisione singola equivalente.Converts the value of the specified 16-bit signed integer to an equivalent single-precision floating-point number.

public:
 static float ToSingle(short value);
public static float ToSingle (short value);
static member ToSingle : int16 -> single
Public Shared Function ToSingle (value As Short) As Single

Parametri

value
Int16 Int16 Int16 Int16

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

Restituisce

Numero a virgola mobile e con precisione singola equivalente a value.A single-precision floating-point number that is equivalent to value.

Esempi

Nell'esempio seguente ogni elemento di una matrice di interi a 16 bit viene convertito in Single un valore.The following example converts each element in an array of 16-bit integers to a Single value.

short[] numbers = { Int16.MinValue, -1032, 0, 192, Int16.MaxValue };
float result;

foreach (short number in numbers)
{
   result = Convert.ToSingle(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 Int16 value '-32768' to the Single value -32768.
//    Converted the Int16 value '-1032' to the Single value -1032.
//    Converted the Int16 value '0' to the Single value 0.
//    Converted the Int16 value '192' to the Single value 192.
//    Converted the Int16 value '32767' to the Single value 32767.
Dim numbers() As Short = { Int16.MinValue, -1032, 0, 192, Int16.MaxValue }
Dim result As Single

For Each number As Short In numbers
   result = Convert.ToSingle(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 Int16 value '-32768' to the Single value -32768.
'    Converted the Int16 value '-1032' to the Single value -1032.
'    Converted the Int16 value '0' to the Single value 0.
'    Converted the Int16 value '192' to the Single value 192.
'    Converted the Int16 value '32767' to the Single value 32767.

ToSingle(Double) ToSingle(Double) ToSingle(Double) ToSingle(Double)

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

public:
 static float ToSingle(double value);
public static float ToSingle (double value);
static member ToSingle : double -> single
Public Shared Function ToSingle (value As Double) As Single

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 a virgola mobile e con precisione singola equivalente a value.A single-precision floating-point number that is equivalent to value.

value viene arrotondato al valore più vicino.value is rounded using rounding to nearest. Se arrotondato a due numeri decimali, ad esempio, il valore 2,345 diventa 2,34 e il valore 2,355 diventa 2,36.For example, when rounded to two decimals, the value 2.345 becomes 2.34 and the value 2.355 becomes 2.36.

Esempi

Nell'esempio seguente ogni elemento di una matrice di Double valori viene convertito in un Single valore.The following example converts each element in an array of Double values to a Single value.

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

foreach (double value in values)
{
   result = Convert.ToSingle(value);
   Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.", 
                     value.GetType().Name, value, 
                     result.GetType().Name, result);
}                                 
// The example displays the following output:
//    Converted the Double value '-1.79769313486232E+308' to the Single value -Infinity.
//    Converted the Double value '-13800000000' to the Single value -1.38E+10.
//    Converted the Double value '-1023.299' to the Single value -1023.299.
//    Converted the Double value '-12.98' to the Single value -12.98.
//    Converted the Double value '0' to the Single value 0.
//   Converted the Double value '9.113E-16' to the Single value 9.113E-16.
//    Converted the Double value '103.919' to the Single value 103.919.
//    Converted the Double value '17834.191' to the Single value 17834.19.
//    Converted the Double value '1.79769313486232E+308' to the Single value Infinity.
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 Single

For Each value As Double In values
   result = Convert.ToSingle(value)
   Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.", _
                     value.GetType().Name, value, _
                     result.GetType().Name, result)
Next                                 
' The example displays the following output:
'    Converted the Double value '-1.79769313486232E+308' to the Single value -Infinity.
'    Converted the Double value '-13800000000' to the Single value -1.38E+10.
'    Converted the Double value '-1023.299' to the Single value -1023.299.
'    Converted the Double value '-12.98' to the Single value -12.98.
'    Converted the Double value '0' to the Single value 0.
'    Converted the Double value '9.113E-16' to the Single value 9.113E-16.
'    Converted the Double value '103.919' to the Single value 103.919.
'    Converted the Double value '17834.191' to the Single value 17834.19.
'    Converted the Double value '1.79769313486232E+308' to the Single value Infinity.
Vedi anche

ToSingle(Decimal) ToSingle(Decimal) ToSingle(Decimal) ToSingle(Decimal)

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

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

Parametri

value
Decimal Decimal Decimal Decimal

Numero decimale da convertire.The decimal number to convert.

Restituisce

Numero a virgola mobile e con precisione singola equivalente a value.A single-precision floating-point number that is equivalent to value.

value viene arrotondato al valore più vicino.value is rounded using rounding to nearest. Se arrotondato a due numeri decimali, ad esempio, il valore 2,345 diventa 2,34 e il valore 2,355 diventa 2,36.For example, when rounded to two decimals, the value 2.345 becomes 2.34 and the value 2.355 becomes 2.36.

Esempi

Nell'esempio seguente ogni elemento di una matrice di Decimal valori viene convertito in un Single valore.The following example converts each element in an array of Decimal values to a Single value.

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

foreach (float value in values)
{
   result = Convert.ToSingle(value);
   Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.",
                     value.GetType().Name, value,
                     result.GetType().Name, result);
}                                  
// The example displays the following output:
//    Converted the Decimal value '-79228162514264337593543950335' to the Single value -7.922816E+28.
//    Converted the Decimal value '-1034.23' to the Single value -1034.23.
//    Converted the Decimal value '-12' to the Single value -12.
//    Converted the Decimal value '0' to the Single value 0.
//    Converted the Decimal value '147' to the Single value 147.
//    Converted the Decimal value '199.55' to the Single value 199.55.
//    Converted the Decimal value '9214.16' to the Single value 9214.16.
//    Converted the Decimal value '79228162514264337593543950335' to the Single value 7.922816E+28.
Dim values() As Decimal = { Decimal.MinValue, -1034.23d, -12d, 0d, 147d, _
                            199.55d, 9214.16d, Decimal.MaxValue }
Dim result As Single

For Each value As Decimal In values
   result = Convert.ToSingle(value)
   Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.", _
                     value.GetType().Name, value, _
                     result.GetType().Name, result)
Next                                  
' The example displays the following output:
'    Converted the Decimal value '-79228162514264337593543950335' to the Single value -7.922816E+28.
'    Converted the Decimal value '-1034.23' to the Single value -1034.23.
'    Converted the Decimal value '-12' to the Single value -12.
'    Converted the Decimal value '0' to the Single value 0.
'    Converted the Decimal value '147' to the Single value 147.
'    Converted the Decimal value '199.55' to the Single value 199.55.
'    Converted the Decimal value '9214.16' to the Single value 9214.16.
'    Converted the Decimal value '79228162514264337593543950335' to the Single value 7.922816E+28.
Vedi anche

ToSingle(DateTime) ToSingle(DateTime) ToSingle(DateTime) ToSingle(DateTime)

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

public:
 static float ToSingle(DateTime value);
public static float ToSingle (DateTime value);
static member ToSingle : DateTime -> single
Public Shared Function ToSingle (value As DateTime) As Single

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.

ToSingle(Char) ToSingle(Char) ToSingle(Char) ToSingle(Char)

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

public:
 static float ToSingle(char value);
public static float ToSingle (char value);
static member ToSingle : char -> single
Public Shared Function ToSingle (value As Char) As Single

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.

Vedi anche

ToSingle(Byte) ToSingle(Byte) ToSingle(Byte) ToSingle(Byte)

Converte il valore dell'intero senza segno a 8 bit specificato nel numero a virgola mobile a precisione singola equivalente.Converts the value of the specified 8-bit unsigned integer to the equivalent single-precision floating-point number.

public:
 static float ToSingle(System::Byte value);
public static float ToSingle (byte value);
static member ToSingle : byte -> single
Public Shared Function ToSingle (value As Byte) As Single

Parametri

value
Byte Byte Byte Byte

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

Restituisce

Numero a virgola mobile e con precisione singola equivalente a value.A single-precision floating-point number that is equivalent to value.

Esempi

Nell'esempio seguente ogni elemento di una matrice di valori di byte viene convertito Single in un valore.The following example converts each element in an array of byte values to a Single value.

byte[] numbers = { Byte.MinValue, 10, 100, Byte.MaxValue };
float result;

foreach (byte number in numbers)
{
   result = Convert.ToSingle(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 Byte value 0 to the Single value 0.
//       Converted the Byte value 10 to the Single value 10.
//       Converted the Byte value 100 to the Single value 100.
//       Converted the Byte value 255 to the Single value 255.
Dim numbers() As Byte = { Byte.MinValue, 10, 100, Byte.MaxValue }
Dim result As Single

For Each number As Byte In numbers
   result = Convert.ToSingle(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 Byte value 0 to the Single value 0.
'       Converted the Byte value 10 to the Single value 10.
'       Converted the Byte value 100 to the Single value 100.
'       Converted the Byte value 255 to the Single value 255.

ToSingle(Boolean) ToSingle(Boolean) ToSingle(Boolean) ToSingle(Boolean)

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

public:
 static float ToSingle(bool value);
public static float ToSingle (bool value);
static member ToSingle : bool -> single
Public Shared Function ToSingle (value As Boolean) As Single

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

Nell'esempio seguente vengono convertiti i true valori false booleani Single e i valori.The following example converts the Boolean values true and false to Single values.

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

foreach (bool flag in flags)
{
   result = Convert.ToSingle(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 Single

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

ToSingle(Int64) ToSingle(Int64) ToSingle(Int64) ToSingle(Int64)

Converte il valore dell'intero con segno a 64 bit specificato in un numero a virgola mobile a precisione singola equivalente.Converts the value of the specified 64-bit signed integer to an equivalent single-precision floating-point number.

public:
 static float ToSingle(long value);
public static float ToSingle (long value);
static member ToSingle : int64 -> single
Public Shared Function ToSingle (value As Long) As Single

Parametri

value
Int64 Int64 Int64 Int64

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

Restituisce

Numero a virgola mobile e con precisione singola equivalente a value.A single-precision floating-point number that is equivalent to value.

Esempi

Nell'esempio seguente ogni elemento di una matrice di valori long integer viene convertito in Single un valore.The following example converts each element in an array of long integers to a Single value.

long[] numbers = { Int64.MinValue, -903, 0, 172, Int64.MaxValue};
double result;

foreach (long number in numbers)
{
   result = Convert.ToDouble(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 Int64 value '-9223372036854775808' to the Single value -9.223372E+18.
//    Converted the Int64 value '-903' to the Single value -903.
//    Converted the Int64 value '0' to the Single value 0.
//    Converted the Int64 value '172' to the Single value 172.
//    Converted the Int64 value '9223372036854775807' to the Single value 9.223372E+18.
Dim numbers() As Long = { Int64.MinValue, -903, 0, 172, Int64.MaxValue}
Dim result As Single

For Each number As Long In numbers
   result = Convert.ToSingle(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 Int64 value '-9223372036854775808' to the Single value -9.223372E+18.
'    Converted the Int64 value '-903' to the Single value -903.
'    Converted the Int64 value '0' to the Single value 0.
'    Converted the Int64 value '172' to the Single value 172.
'    Converted the Int64 value '9223372036854775807' to the Single value 9.223372E+18.

Si applica a