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

Definição

Converte um valor especificado em um número de ponto flutuante de precisão simples.Converts a specified value to a single-precision floating-point number.

Sobrecargas

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

Converte a representação de cadeia de caracteres de um número especificada em um número de ponto flutuante de precisão simples equivalente, usando as informações de formatação específicas da cultura especificadas.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 o valor do inteiro com sinal de 8 bits especificado no número de ponto flutuante de precisão simples 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 o valor do objeto especificado em um número de ponto flutuante de precisão simples, usando as informações de formatação específicas à cultura especificadas.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 o valor do inteiro sem sinal de 64 bits especificado em um número de ponto flutuante de precisão simples 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 o valor do inteiro sem sinal de 32 bits especificado em um número de ponto flutuante de precisão simples 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 a representação de cadeia de caracteres especificada de um número em um número de ponto flutuante de precisão simples 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)

Retorna o número de ponto flutuante de precisão simples especificado; nenhuma conversão real é executada.Returns the specified single-precision floating-point number; no actual conversion is performed.

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

Converte o valor do objeto especificado em um número de ponto flutuante de precisão simples.Converts the value of the specified object to a single-precision floating-point number.

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

Converte o valor do inteiro sem sinal de 16 bits especificado no número de ponto flutuante de precisão simples 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 o valor do inteiro com sinal de 32 bits especificado em um número de ponto flutuante de precisão simples 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 o valor do inteiro com sinal de 16 bits especificado em um número de ponto flutuante de precisão simples 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 o valor do número de ponto flutuante de precisão dupla especificado em um número de ponto flutuante de precisão simples 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 o valor do número decimal especificado para um número de ponto flutuante de precisão simples 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)

A chamada desse método sempre lança InvalidCastException.Calling this method always throws InvalidCastException.

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

A chamada desse método sempre lança InvalidCastException.Calling this method always throws InvalidCastException.

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

Converte o valor do inteiro sem sinal de 8 bits especificado no número de ponto flutuante de precisão simples 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 o valor booliano especificado no número de ponto flutuante de precisão simples equivalente.Converts the specified Boolean value to the equivalent single-precision floating-point number.

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

Converte o valor do inteiro com sinal de 64 bits especificado em um número de ponto flutuante de precisão simples 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 a representação de cadeia de caracteres de um número especificada em um número de ponto flutuante de precisão simples equivalente, usando as informações de formatação específicas da cultura especificadas.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

Parâmetros

value
String String String String

Uma cadeia de caracteres que contém o número a ser convertido.A string that contains the number to convert.

provider
IFormatProvider IFormatProvider IFormatProvider IFormatProvider

Um objeto que fornece informações de formatação específicas de cultura.An object that supplies culture-specific formatting information.

Retornos

Um número de ponto flutuante de precisão simples que é equivalente ao número em value ou 0 (zero) se value for null.A single-precision floating-point number that is equivalent to the number in value, or 0 (zero) if value is null.

Exceções

value não é um número em um formato válido.value is not a number in a valid format.

value representa um número que é menor que MinValue ou maior que MaxValue.value represents a number that is less than MinValue or greater than MaxValue.

Exemplos

O exemplo a seguir IFormatProvider usa objetos que representam as culturas en-US e fr-FR quando converte os elementos em uma matriz de cadeias de Single caracteres numéricas em valores.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

Comentários

O valor de retorno é o resultado da invocação Single.Parse do método valueem.The return value is the result of invoking the Single.Parse method on value.

provider é uma instância de IFormatProvider que obtém um objeto NumberFormatInfo.provider is an IFormatProvider instance that obtains a NumberFormatInfo object. O objeto NumberFormatInfo fornece informações específicas da cultura sobre o formato de value.The NumberFormatInfo object provides culture-specific information about the format of value. Caso provider seja null, NumberFormatInfo da cultura atual é usado.If provider is null, the NumberFormatInfo for the current culture is used.

Se você preferir não tratar uma exceção se a conversão falhar, você poderá chamar o Single.TryParse método em vez disso.If you prefer not to handle an exception if the conversion fails, you can call the Single.TryParse method instead. Ele retorna um valor Boolean que indica se a conversão foi bem-sucedida ou falhou.It returns a Boolean value that indicates whether the conversion succeeded or failed.

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

Importante

Esta API não está em conformidade com CLS.

Converte o valor do inteiro com sinal de 8 bits especificado no número de ponto flutuante de precisão simples 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

Parâmetros

value
SByte SByte SByte SByte

O inteiro com sinal de 8 bits a ser convertido.The 8-bit signed integer to convert.

Retornos

Um inteiro assinado de 8 bits equivalente a value.An 8-bit signed integer that is equivalent to value.

Exemplos

O exemplo a seguir converte cada elemento em uma matriz de bytes assinada em um Single valor.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 o valor do objeto especificado em um número de ponto flutuante de precisão simples, usando as informações de formatação específicas à cultura especificadas.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

Parâmetros

value
Object Object Object Object

Um objeto que implementa a interface do IConvertible.An object that implements the IConvertible interface.

provider
IFormatProvider IFormatProvider IFormatProvider IFormatProvider

Um objeto que fornece informações de formatação específicas de cultura.An object that supplies culture-specific formatting information.

Retornos

Um número de ponto flutuante de precisão simples que é equivalente a value ou zero se value for null.A single-precision floating-point number that is equivalent to value, or zero if value is null.

Exceções

value não está em um formato adequado.value is not in an appropriate format.

value representa um número que é menor que MinValue ou maior que MaxValue.value represents a number that is less than MinValue or greater than MaxValue.

Exemplos

O exemplo a seguir define uma classe Temperature que implementa a interface IConvertible.The following example defines a Temperature class that implements the IConvertible interface. Sua implementação do IConvertible.ToSingle método retorna o valor interno de uma variável privada Single que representa a 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

O exemplo a seguir ilustra como uma chamada para Convert.ToSingle(Object, IFormatProvider) o método, por sua vez, IConvertible.ToSingle chama a implementação Temperature da 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

Comentários

O valor de retorno é o resultado da invocação IConvertible.ToSingle do método do tipo subjacente de value.The return value is the result of invoking the IConvertible.ToSingle method of the underlying type of value.

provider permite que o usuário especifique informações de conversão específicas de cultura sobre o conteúdo de value.provider enables the user to specify culture-specific conversion information about the contents of value. Por exemplo, se value fosse um String que representa um número, provider poderia fornecer informações específicas de cultura sobre a notação usada para representar esse número.For example, if value is a String that represents a number, provider could supply culture-specific information about the notation used to represent that number.

Os tipos de base ignoram provider; no entanto, o parâmetro pode ser usado caso value seja um tipo definido pelo usuário que implementa a interface IConvertible.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

Esta API não está em conformidade com CLS.

Converte o valor do inteiro sem sinal de 64 bits especificado em um número de ponto flutuante de precisão simples 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

Parâmetros

value
UInt64 UInt64 UInt64 UInt64

O inteiro sem sinal de 64 bits a ser convertido.The 64-bit unsigned integer to convert.

Retornos

Um número de ponto flutuante de precisão simples equivalente a value.A single-precision floating-point number that is equivalent to value.

Exemplos

O exemplo a seguir converte cada elemento em uma matriz de inteiros longos não assinados em um Single valor.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

Esta API não está em conformidade com CLS.

Converte o valor do inteiro sem sinal de 32 bits especificado em um número de ponto flutuante de precisão simples 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

Parâmetros

value
UInt32 UInt32 UInt32 UInt32

O inteiro sem sinal de 32 bits a ser convertido.The 32-bit unsigned integer to convert.

Retornos

Um número de ponto flutuante de precisão simples equivalente a value.A single-precision floating-point number that is equivalent to value.

Exemplos

O exemplo a seguir converte cada elemento em uma matriz de inteiros não assinados em um Single valor.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 a representação de cadeia de caracteres especificada de um número em um número de ponto flutuante de precisão simples 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

Parâmetros

value
String String String String

Uma cadeia de caracteres que contém o número a ser convertido.A string that contains the number to convert.

Retornos

Um número de ponto flutuante de precisão simples que é equivalente ao número em value ou 0 (zero) se value for null.A single-precision floating-point number that is equivalent to the number in value, or 0 (zero) if value is null.

Exceções

value não é um número em um formato válido.value is not a number in a valid format.

value representa um número que é menor que MinValue ou maior que MaxValue.value represents a number that is less than MinValue or greater than MaxValue.

Exemplos

O exemplo a seguir tenta converter cada elemento em uma matriz de cadeias de caracteres Single numéricas em um valor.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.

Comentários

O uso ToSingle(String) do método é equivalente ao value passar para Single.Parse(String) o método.Using the ToSingle(String) method is equivalent to passing value to the Single.Parse(String) method. value é interpretado usando-se as convenções de formatação da cultura do thread atual.value is interpreted by using the formatting conventions of the current thread culture.

Se você preferir não tratar uma exceção se a conversão falhar, você poderá chamar o Single.TryParse método em vez disso.If you prefer not to handle an exception if the conversion fails, you can call the Single.TryParse method instead. Ele retorna um valor Boolean que indica se a conversão foi bem-sucedida ou falhou.It returns a Boolean value that indicates whether the conversion succeeded or failed.

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

Retorna o número de ponto flutuante de precisão simples especificado; nenhuma conversão real é executada.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

Parâmetros

value
Single Single Single Single

O número de ponto flutuante de precisão simples a ser retornado.The single-precision floating-point number to return.

Retornos

value é retornado inalterado.value is returned unchanged.

Veja também

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

Converte o valor do objeto especificado em um número de ponto flutuante de precisão simples.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

Parâmetros

value
Object Object Object Object

Um objeto que implementa a interface IConvertible ou null.An object that implements the IConvertible interface, or null.

Retornos

Um número de ponto flutuante de precisão simples que é equivalente a value ou zero se value for null.A single-precision floating-point number that is equivalent to value, or zero if value is null.

Exceções

value não está em um formato adequado.value is not in an appropriate format.

value não implementa a interface IConvertible.value does not implement the IConvertible interface.

- ou --or- A conversão não é suportada.The conversion is not supported.

value representa um número que é menor que MinValue ou maior que MaxValue.value represents a number that is less than MinValue or greater than MaxValue.

Exemplos

O exemplo a seguir tenta converter cada elemento em uma matriz de objeto em Single um valor.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.

Comentários

O valor de retorno é o resultado da invocação IConvertible.ToSingle do método do tipo subjacente de value.The 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

Esta API não está em conformidade com CLS.

Converte o valor do inteiro sem sinal de 16 bits especificado no número de ponto flutuante de precisão simples 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

Parâmetros

value
UInt16 UInt16 UInt16 UInt16

O inteiro não assinado de 16 bits a ser convertido.The 16-bit unsigned integer to convert.

Retornos

Um número de ponto flutuante de precisão simples equivalente a value.A single-precision floating-point number that is equivalent to value.

Exemplos

O exemplo a seguir converte cada elemento em uma matriz de inteiros de 16 bits não assinados em um Single valor.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 o valor do inteiro com sinal de 32 bits especificado em um número de ponto flutuante de precisão simples 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

Parâmetros

value
Int32 Int32 Int32 Int32

O inteiro com sinal de 32 bits a converter.The 32-bit signed integer to convert.

Retornos

Um número de ponto flutuante de precisão simples equivalente a value.A single-precision floating-point number that is equivalent to value.

Exemplos

O exemplo a seguir converte cada elemento em uma matriz de inteiros Single em um valor.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 o valor do inteiro com sinal de 16 bits especificado em um número de ponto flutuante de precisão simples 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

Parâmetros

value
Int16 Int16 Int16 Int16

O inteiro assinado de 16 bits a ser convertido.The 16-bit signed integer to convert.

Retornos

Um número de ponto flutuante de precisão simples equivalente a value.A single-precision floating-point number that is equivalent to value.

Exemplos

O exemplo a seguir converte cada elemento em uma matriz de inteiros de 16 bits em um Single valor.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 o valor do número de ponto flutuante de precisão dupla especificado em um número de ponto flutuante de precisão simples 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

Parâmetros

value
Double Double Double Double

O número de ponto flutuante de precisão dupla a ser convertido.The double-precision floating-point number to convert.

Retornos

Um número de ponto flutuante de precisão simples equivalente a value.A single-precision floating-point number that is equivalent to value.

value é arredondado usando o arredondamento mais próximo.value is rounded using rounding to nearest. Por exemplo, quando arredondado para duas casas decimais, o valor 2.345 torna-se 2.34 e 2.355 torna-se o valor 2.36.For example, when rounded to two decimals, the value 2.345 becomes 2.34 and the value 2.355 becomes 2.36.

Exemplos

O exemplo a seguir converte cada elemento em uma matriz Double de valores em Single um valor.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.
Veja também

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

Converte o valor do número decimal especificado para um número de ponto flutuante de precisão simples 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

Parâmetros

value
Decimal Decimal Decimal Decimal

O número decimal a ser convertido.The decimal number to convert.

Retornos

Um número de ponto flutuante de precisão simples equivalente a value.A single-precision floating-point number that is equivalent to value.

value é arredondado usando o arredondamento mais próximo.value is rounded using rounding to nearest. Por exemplo, quando arredondado para duas casas decimais, o valor 2.345 torna-se 2.34 e 2.355 torna-se o valor 2.36.For example, when rounded to two decimals, the value 2.345 becomes 2.34 and the value 2.355 becomes 2.36.

Exemplos

O exemplo a seguir converte cada elemento em uma matriz Decimal de valores em Single um valor.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.
Veja também

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

A chamada desse método sempre lança 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

Parâmetros

value
DateTime DateTime DateTime DateTime

O valor de data e tempo a ser convertido.The date and time value to convert.

Retornos

Esta conversão não é suportada.This conversion is not supported. Nenhum valor é retornado.No value is returned.

Exceções

Esta conversão não é suportada.This conversion is not supported.

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

A chamada desse método sempre lança 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

Parâmetros

value
Char Char Char Char

O caractere Unicode a ser convertido.The Unicode character to convert.

Retornos

Esta conversão não é suportada.This conversion is not supported. Nenhum valor é retornado.No value is returned.

Exceções

Esta conversão não é suportada.This conversion is not supported.

Veja também

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

Converte o valor do inteiro sem sinal de 8 bits especificado no número de ponto flutuante de precisão simples 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

Parâmetros

value
Byte Byte Byte Byte

O inteiro sem sinal de 8 bits a ser convertido.The 8-bit unsigned integer to convert.

Retornos

Um número de ponto flutuante de precisão simples equivalente a value.A single-precision floating-point number that is equivalent to value.

Exemplos

O exemplo a seguir converte cada elemento em uma matriz de valores de bytes Single em um valor.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 o valor booliano especificado no número de ponto flutuante de precisão simples 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

Parâmetros

value
Boolean Boolean Boolean Boolean

O valor booliano a ser convertido.The Boolean value to convert.

Retornos

O número 1 caso value seja true; do contrário, 0.The number 1 if value is true; otherwise, 0.

Exemplos

O exemplo a seguir converte os valores true boolianos Single e false em valores.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 o valor do inteiro com sinal de 64 bits especificado em um número de ponto flutuante de precisão simples 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

Parâmetros

value
Int64 Int64 Int64 Int64

O inteiro com sinal de 64 bits a ser convertido.The 64-bit signed integer to convert.

Retornos

Um número de ponto flutuante de precisão simples equivalente a value.A single-precision floating-point number that is equivalent to value.

Exemplos

O exemplo a seguir converte cada elemento em uma matriz de inteiros longos em um Single valor.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.

Aplica-se a