Convert.ToSingle Metodo
Importante
Alcune informazioni sono relative alla release non definitiva del prodotto, che potrebbe subire modifiche significative prima della release definitiva. Microsoft non riconosce alcuna garanzia, espressa o implicita, in merito alle informazioni qui fornite.
Converte un valore specificato in un numero a virgola mobile e precisione singola.
ToSingle(String, IFormatProvider) |
Converte la rappresentazione di stringa specificata di un numero in un numero a virgola mobile a precisione singola equivalente, utilizzando le informazioni di formattazione specifiche delle impostazioni cultura specificate. |
ToSingle(SByte) |
Converte il valore dell'intero con segno a 8 bit specificato nel numero a virgola mobile a precisione singola equivalente. |
ToSingle(Object, IFormatProvider) |
Converte il valore dell'oggetto specificato in un numero a virgola mobile e precisione singola utilizzando le informazioni di formattazione specifiche delle impostazioni cultura specificate. |
ToSingle(UInt64) |
Converte il valore dell'intero senza segno a 64 bit specificato in un numero a virgola mobile a precisione singola equivalente. |
ToSingle(UInt32) |
Converte il valore dell'intero senza segno a 32 bit specificato in un numero a virgola mobile a precisione singola equivalente. |
ToSingle(String) |
Converte la rappresentazione di stringa specificata di un numero in un numero a virgola mobile a precisione singola equivalente. |
ToSingle(Single) |
Restituisce il numero a virgola mobile e precisione singola specificato; non viene eseguita alcuna conversione effettiva. |
ToSingle(Object) |
Converte il valore dell'oggetto specificato in un numero a virgola mobile a precisione singola. |
ToSingle(UInt16) |
Converte il valore dell'intero senza segno a 16 bit specificato nel numero a virgola mobile a precisione singola equivalente. |
ToSingle(Int32) |
Converte il valore dell'intero con segno a 32 bit specificato in un numero a virgola mobile a precisione singola equivalente. |
ToSingle(Int16) |
Converte il valore dell'intero con segno a 16 bit specificato in un numero a virgola mobile a precisione singola equivalente. |
ToSingle(Double) |
Converte il valore del numero a virgola mobile e precisione doppia specificato in un numero a virgola mobile a precisione singola equivalente. |
ToSingle(Decimal) |
Converte il valore del numero decimale specificato in un numero a virgola mobile a precisione singola equivalente. |
ToSingle(DateTime) |
La chiamata a questo metodo genera sempre InvalidCastException. |
ToSingle(Char) |
La chiamata a questo metodo genera sempre InvalidCastException. |
ToSingle(Byte) |
Converte il valore dell'intero senza segno a 8 bit specificato nel numero a virgola mobile a precisione singola equivalente. |
ToSingle(Boolean) |
Converte il valore booleano specificato nel numero a virgola mobile a precisione singola equivalente. |
ToSingle(Int64) |
Converte il valore dell'intero con segno a 64 bit specificato in un numero a virgola mobile a precisione singola equivalente. |
- Origine:
- Convert.cs
- Origine:
- Convert.cs
- Origine:
- Convert.cs
Converte la rappresentazione di stringa specificata di un numero in un numero a virgola mobile a precisione singola equivalente, utilizzando le informazioni di formattazione specifiche delle impostazioni cultura specificate.
public:
static float ToSingle(System::String ^ value, IFormatProvider ^ provider);
public static float ToSingle (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
Stringa contenente il numero da convertire.
- provider
- IFormatProvider
Oggetto che fornisce informazioni di formattazione specifiche delle impostazioni cultura.
Restituisce
Numero a virgola mobile e precisione singola equivalente al numero in value
o 0 (zero) se value
è null
.
Eccezioni
value
non è un numero in un formato valido.
value
rappresenta un numero minore di Single.MinValue o maggiore di Single.MaxValue.
Esempio
Nell'esempio seguente vengono utilizzati IFormatProvider oggetti che rappresentano le impostazioni cultura en-US e fr-FR quando converte gli elementi in una matrice di stringhe numeriche in valori Single.
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
open System
open System.Globalization
let 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"
string Double.MaxValue |]
let cultures =
[| CultureInfo "en-US"; CultureInfo "fr-FR" |]
for culture in cultures do
printfn $"String -> Single Conversion Using the {culture.Name} Culture"
for value in values do
printf $"{value,22} -> "
try
printfn $"{Convert.ToSingle(value, culture)}"
with
| :? FormatException ->
printfn "FormatException"
| :? OverflowException ->
printfn "OverflowException"
printfn ""
// 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 del metodo Single.Parse in value
.
provider
è un'istanza di IFormatProvider che ottiene un oggetto NumberFormatInfo. L'oggetto NumberFormatInfo fornisce informazioni specifiche delle impostazioni cultura sul formato di value
. Se provider
è null
, viene utilizzata la NumberFormatInfo per le impostazioni cultura correnti.
Se si preferisce non gestire un'eccezione se la conversione non riesce, è possibile chiamare invece il metodo Single.TryParse. Restituisce un valore Boolean che indica se la conversione ha avuto esito positivo o negativo.
Si applica a
- Origine:
- Convert.cs
- Origine:
- Convert.cs
- Origine:
- Convert.cs
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.
public:
static float ToSingle(System::SByte value);
[System.CLSCompliant(false)]
public static float ToSingle (sbyte value);
[<System.CLSCompliant(false)>]
static member ToSingle : sbyte -> single
Public Shared Function ToSingle (value As SByte) As Single
Parametri
- value
- SByte
Intero con segno a 8 bit da convertire.
Restituisce
Intero con segno a 8 bit equivalente a value
.
- Attributi
Esempio
Nell'esempio seguente ogni elemento di una matrice di byte con segno viene convertito in un valore Single.
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.
let numbers = [| SByte.MinValue; -23y; 0y; 17y; SByte.MaxValue |]
for number in numbers do
let result = Convert.ToSingle number
printfn $"Converted the {number.GetType().Name} value {number} to the {result.GetType().Name} value {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.
Si applica a
- Origine:
- Convert.cs
- Origine:
- Convert.cs
- Origine:
- Convert.cs
Converte il valore dell'oggetto specificato in un numero a virgola mobile e precisione singola utilizzando le informazioni di formattazione specifiche delle impostazioni cultura specificate.
public:
static float ToSingle(System::Object ^ value, IFormatProvider ^ provider);
public static float ToSingle (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
Oggetto che implementa l'interfaccia IConvertible.
- provider
- IFormatProvider
Oggetto che fornisce informazioni di formattazione specifiche delle impostazioni cultura.
Restituisce
Numero a virgola mobile e precisione singola equivalente a value
o zero se value
è null
.
Eccezioni
value
non è in un formato appropriato.
value
non implementa IConvertible.
value
rappresenta un numero minore di Single.MinValue o maggiore di Single.MaxValue.
Esempio
Nell'esempio seguente viene definita una classe Temperature
che implementa l'interfaccia IConvertible. L'implementazione del metodo IConvertible.ToSingle restituisce il valore interno di una variabile Single privata che rappresenta la temperatura.
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);
}
}
open System
type Temperature(temperature: float32) =
member _.Celsius =
temperature
member _.Kelvin =
temperature + 273.15f
member _.Fahrenheit =
MathF.Round(temperature * 9f / 5f + 32f, 2)
override _.ToString() =
$"{temperature:N2} °C"
// IConvertible implementations.
interface IConvertible with
member _.GetTypeCode() =
TypeCode.Object
member _.ToBoolean(provider: IFormatProvider) =
temperature <> 0f
member _.ToByte(provider: IFormatProvider) =
if temperature < float32 Byte.MinValue || temperature > float32 Byte.MaxValue then
raise (OverflowException $"{temperature} is out of range of the Byte type.")
else
Convert.ToByte temperature
member _.ToChar(provider: IFormatProvider) =
raise (InvalidCastException "Temperature to Char conversion is not supported.")
member _.ToDateTime(provider: IFormatProvider) =
raise (InvalidCastException "Temperature to DateTime conversion is not supported.")
member _.ToDecimal(provider: IFormatProvider) =
Convert.ToDecimal temperature
member _.ToDouble(provider: IFormatProvider) =
Convert.ToDouble temperature
member _.ToInt16(provider: IFormatProvider) =
if temperature < float32 Int16.MinValue || temperature > float32 Int16.MaxValue then
raise (OverflowException $"{temperature} is out of range of the Int16 type.")
else
Convert.ToInt16 temperature
member _.ToInt32(provider: IFormatProvider) =
if temperature < float32 Int32.MinValue || temperature > float32 Int32.MaxValue then
raise (OverflowException $"{temperature} is out of range of the Int32 type.")
else
Convert.ToInt32 temperature
member _.ToInt64(provider: IFormatProvider) =
if float32 temperature < float32 Int64.MinValue || temperature > float32 Int64.MaxValue then
raise (OverflowException $"{temperature} is out of range of the Int64 type.")
else
Convert.ToInt64 temperature
member _.ToSByte(provider: IFormatProvider) =
if temperature < float32 SByte.MinValue || temperature > float32 SByte.MaxValue then
raise (OverflowException $"{temperature} is out of range of the SByte type.")
else
Convert.ToSByte temperature
member _.ToSingle(provider: IFormatProvider) =
temperature
override _.ToString(provider: IFormatProvider) =
temperature.ToString("N2", provider) + " °C"
member this.ToType(conversionType: Type, provider: IFormatProvider) =
let this = this :> IConvertible
match Type.GetTypeCode conversionType with
| TypeCode.Boolean ->
this.ToBoolean null
| TypeCode.Byte ->
this.ToByte null
| TypeCode.Char ->
this.ToChar null
| TypeCode.DateTime ->
this.ToDateTime null
| TypeCode.Decimal ->
this.ToDecimal null
| TypeCode.Double ->
this.ToDouble null
| TypeCode.Int16 ->
this.ToInt16 null
| TypeCode.Int32 ->
this.ToInt32 null
| TypeCode.Int64 ->
this.ToInt64 null
| TypeCode.Object ->
if typeof<Temperature>.Equals conversionType then
this
else
raise (InvalidCastException $"Conversion to a {conversionType.Name} is not supported.")
| TypeCode.SByte ->
this.ToSByte null
| TypeCode.Single ->
this.ToSingle null
| TypeCode.String ->
this.ToString provider
| TypeCode.UInt16 ->
this.ToUInt16 null
| TypeCode.UInt32 ->
this.ToUInt32 null
| TypeCode.UInt64 ->
this.ToUInt64 null
| _ ->
raise (InvalidCastException $"Conversion to {conversionType.Name} is not supported.")
member _.ToUInt16(provider: IFormatProvider) =
if temperature < float32 UInt16.MinValue || temperature > float32 UInt16.MaxValue then
raise (OverflowException $"{temperature} is out of range of the UInt16 type.")
else
Convert.ToUInt16 temperature
member _.ToUInt32(provider: IFormatProvider) =
if temperature < float32 UInt32.MinValue || temperature > float32 UInt32.MaxValue then
raise (OverflowException $"{temperature} is out of range of the UInt32 type.")
else
Convert.ToUInt32 temperature
member _.ToUInt64(provider: IFormatProvider) =
if temperature < float32 UInt64.MinValue || temperature > float32 UInt64.MaxValue then
raise (OverflowException $"{temperature} is out of range of the UInt64 type.")
else
Convert.ToUInt64 temperature
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 come una chiamata al metodo Convert.ToSingle(Object, IFormatProvider) chiama a sua volta l'implementazione IConvertible.ToSingle della classe Temperature
.
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
let cold = Temperature -40f
let freezing = Temperature 0f
let boiling = Temperature 100f
printfn $"{Convert.ToInt32(cold, null)}"
printfn $"{Convert.ToInt32(freezing, null)}"
printfn $"{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 metodo IConvertible.ToSingle del tipo sottostante di value
.
provider
consente all'utente di specificare informazioni di conversione specifiche delle impostazioni cultura relative al contenuto di value
. Ad esempio, se value
è un String che rappresenta un numero, provider
potrebbe fornire informazioni specifiche delle impostazioni cultura sulla notazione usata per rappresentare tale numero.
I tipi di base ignorano provider
; Tuttavia, il parametro può essere usato se value
è un tipo definito dall'utente che implementa l'interfaccia IConvertible.
Si applica a
- Origine:
- Convert.cs
- Origine:
- Convert.cs
- Origine:
- Convert.cs
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.
public:
static float ToSingle(System::UInt64 value);
[System.CLSCompliant(false)]
public static float ToSingle (ulong value);
[<System.CLSCompliant(false)>]
static member ToSingle : uint64 -> single
Public Shared Function ToSingle (value As ULong) As Single
Parametri
- value
- UInt64
Intero senza segno a 64 bit da convertire.
Restituisce
Numero a virgola mobile e precisione singola equivalente a value
.
- Attributi
Esempio
Nell'esempio seguente ogni elemento in una matrice di interi lunghi senza segno viene convertito in un valore Single.
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.
let numbers = [| UInt64.MinValue; 121uL; 12345uL; UInt64.MaxValue |]
for number in numbers do
let result = Convert.ToSingle number
printfn $"Converted the {number.GetType().Name} value {number} to the {result.GetType().Name} value {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.
Si applica a
- Origine:
- Convert.cs
- Origine:
- Convert.cs
- Origine:
- Convert.cs
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.
public:
static float ToSingle(System::UInt32 value);
[System.CLSCompliant(false)]
public static float ToSingle (uint value);
[<System.CLSCompliant(false)>]
static member ToSingle : uint32 -> single
Public Shared Function ToSingle (value As UInteger) As Single
Parametri
- value
- UInt32
Intero senza segno a 32 bit da convertire.
Restituisce
Numero a virgola mobile e precisione singola equivalente a value
.
- Attributi
Esempio
Nell'esempio seguente ogni elemento di una matrice di interi senza segno viene convertito in un valore Single.
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.
let numbers = [| UInt32.MinValue; 121u; 12345u; UInt32.MaxValue |]
for number in numbers do
let result = Convert.ToSingle number
printfn $"Converted the {number.GetType().Name} value {number} to the {result.GetType().Name} value {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.
Si applica a
- Origine:
- Convert.cs
- Origine:
- Convert.cs
- Origine:
- Convert.cs
Converte la rappresentazione di stringa specificata di un numero in un numero a virgola mobile a precisione singola equivalente.
public:
static float ToSingle(System::String ^ value);
public static float ToSingle (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
Stringa contenente il numero da convertire.
Restituisce
Numero a virgola mobile e precisione singola equivalente al numero in value
o 0 (zero) se value
è null
.
Eccezioni
value
non è un numero in un formato valido.
value
rappresenta un numero minore di Single.MinValue o maggiore di Single.MaxValue.
Esempio
Nell'esempio seguente viene eseguito un tentativo di convertire ogni elemento in una matrice di stringhe numeriche in un valore Single.
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.
let values =
[| "-1,035.77219"; "1AFF"; "1e-35"; "1.63f"; "1,635,592,999,999,999,999,999,999"
"-17.455"; "190.34001"; "1.29e325" |]
for value in values do
try
let result = Convert.ToSingle value
printfn $"Converted the {value.GetType().Name} value {value} to the {result.GetType().Name} value {result}."
with
| :? FormatException ->
printfn $"Unable to convert '{value}' to a Single."
| :? OverflowException ->
printfn $"'{value}' is outside the range of a Single."
// 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'uso del metodo ToSingle(String) equivale al passaggio di value
al metodo Single.Parse(String).
value
viene interpretato usando le convenzioni di formattazione delle impostazioni cultura correnti.
Se si preferisce non gestire un'eccezione se la conversione non riesce, è possibile chiamare invece il metodo Single.TryParse. Restituisce un valore Boolean che indica se la conversione ha avuto esito positivo o negativo.
Si applica a
- Origine:
- Convert.cs
- Origine:
- Convert.cs
- Origine:
- Convert.cs
Restituisce il numero a virgola mobile e precisione singola specificato; non viene eseguita alcuna conversione effettiva.
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
Numero a virgola mobile e precisione singola da restituire.
Restituisce
value
viene restituito invariato.
Vedi anche
Si applica a
- Origine:
- Convert.cs
- Origine:
- Convert.cs
- Origine:
- Convert.cs
Converte il valore dell'oggetto specificato in un numero a virgola mobile a precisione singola.
public:
static float ToSingle(System::Object ^ value);
public static float ToSingle (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
Oggetto che implementa l'interfaccia IConvertible o null
.
Restituisce
Numero a virgola mobile e precisione singola equivalente a value
o zero se value
è null
.
Eccezioni
value
non è in un formato appropriato.
value
rappresenta un numero minore di Single.MinValue o maggiore di Single.MaxValue.
Esempio
Nell'esempio seguente viene eseguito un tentativo di convertire ogni elemento in una matrice di oggetti in un valore Single.
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.
let values: obj[] =
[| true; 'a'; 123; 1.764e32; "9.78"; "1e-02"; 1.67e03; "A100"; "1,033.67"; DateTime.Now; Decimal.MaxValue |]
for value in values do
try
let result = Convert.ToSingle value
printfn $"Converted the {value.GetType().Name} value {value} to the {result.GetType().Name} value {result}."
with
| :? FormatException ->
printfn $"The {value.GetType().Name} value {value} is not recognized as a valid Single value."
| :? OverflowException ->
printfn $"The {value.GetType().Name} value {value} is outside the range of the Single type."
| :? InvalidCastException ->
printfn $"Conversion of the {value.GetType().Name} value {value} to a Single is not supported."
// 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 metodo IConvertible.ToSingle del tipo sottostante di value
.
Si applica a
- Origine:
- Convert.cs
- Origine:
- Convert.cs
- Origine:
- Convert.cs
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.
public:
static float ToSingle(System::UInt16 value);
[System.CLSCompliant(false)]
public static float ToSingle (ushort value);
[<System.CLSCompliant(false)>]
static member ToSingle : uint16 -> single
Public Shared Function ToSingle (value As UShort) As Single
Parametri
- value
- UInt16
Intero senza segno a 16 bit da convertire.
Restituisce
Numero a virgola mobile e precisione singola equivalente a value
.
- Attributi
Esempio
L'esempio seguente converte ogni elemento in una matrice di interi senza segno a 16 bit in un valore Single.
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.
let numbers = [| UInt16.MinValue; 121us; 12345us; UInt16.MaxValue |]
for number in numbers do
let result = Convert.ToSingle number
printfn $"Converted the {number.GetType().Name} value {number} to the {result.GetType().Name} value {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.
Si applica a
- Origine:
- Convert.cs
- Origine:
- Convert.cs
- Origine:
- Convert.cs
Converte il valore dell'intero con segno a 32 bit specificato in un numero a virgola mobile a precisione singola equivalente.
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
Intero con segno a 32 bit da convertire.
Restituisce
Numero a virgola mobile e precisione singola equivalente a value
.
Esempio
Nell'esempio seguente ogni elemento di una matrice integer viene convertito in un valore Single.
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.
let numbers =
[| Int32.MinValue; -1000; 0; 1000; Int32.MaxValue |]
for number in numbers do
let result = Convert.ToSingle number
printfn $"Converted the {number.GetType().Name} value {number} to the {result.GetType().Name} value {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.
Si applica a
- Origine:
- Convert.cs
- Origine:
- Convert.cs
- Origine:
- Convert.cs
Converte il valore dell'intero con segno a 16 bit specificato in un numero a virgola mobile a precisione singola equivalente.
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
Intero con segno a 16 bit da convertire.
Restituisce
Numero a virgola mobile e precisione singola equivalente a value
.
Esempio
Nell'esempio seguente ogni elemento in una matrice di interi a 16 bit viene convertito in un valore Single.
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.
let numbers =
[| Int16.MinValue; -1032s; 0s; 192s; Int16.MaxValue |]
for number in numbers do
let result = Convert.ToSingle number
printfn $"Converted the {number.GetType().Name} value {number} to the {result.GetType().Name} value {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.
Si applica a
- Origine:
- Convert.cs
- Origine:
- Convert.cs
- Origine:
- Convert.cs
Converte il valore del numero a virgola mobile e precisione doppia specificato in un numero a virgola mobile a precisione singola equivalente.
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
Numero a virgola mobile e precisione doppia da convertire.
Restituisce
Numero a virgola mobile e precisione singola equivalente a value
.
value
viene arrotondato usando l'arrotondamento al più vicino. Ad esempio, se arrotondato a due decimali, il valore 2,345 diventa 2,34 e il valore 2,355 diventa 2,36.
Esempio
Nell'esempio seguente ogni elemento in una matrice di valori di Double viene convertito in un valore Single.
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.
let values =
[| Double.MinValue; -1.38e10; -1023.299; -12.98; 0; 9.113e-16; 103.919; 17834.191; Double.MaxValue |]
for value in values do
let result = Convert.ToSingle value
printfn $"Converted the {value.GetType().Name} value {value} to the {result.GetType().Name} value {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
Si applica a
- Origine:
- Convert.cs
- Origine:
- Convert.cs
- Origine:
- Convert.cs
Converte il valore del numero decimale specificato in un numero a virgola mobile a precisione singola equivalente.
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
Numero decimale da convertire.
Restituisce
Numero a virgola mobile e precisione singola equivalente a value
.
value
viene arrotondato usando l'arrotondamento al più vicino. Ad esempio, se arrotondato a due decimali, il valore 2,345 diventa 2,34 e il valore 2,355 diventa 2,36.
Esempio
Nell'esempio seguente ogni elemento in una matrice di valori di Decimal viene convertito in un valore Single.
decimal[] values = { Decimal.MinValue, -1034.23m, -12m, 0m, 147m,
199.55m, 9214.16m, Decimal.MaxValue };
float result;
foreach (var 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 -7.9228163E+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 7.9228163E+28.
let values =
[| Decimal.MinValue; -1034.23m; -12m; 0m; 147m; 199.55m; 9214.16m; Decimal.MaxValue |]
for value in values do
let result = Convert.ToSingle value
printfn $"Converted the {value.GetType().Name} value {value} to the {result.GetType().Name} value {result}."
// The example displays the following output:
// Converted the Decimal value '-79228162514264337593543950335' to the Single value -7.9228163E+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 7.9228163E+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
Si applica a
- Origine:
- Convert.cs
- Origine:
- Convert.cs
- Origine:
- Convert.cs
La chiamata a questo metodo genera sempre 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
Valore di data e ora da convertire.
Restituisce
Questa conversione non è supportata. Non viene restituito alcun valore.
Eccezioni
Questa conversione non è supportata.
Si applica a
- Origine:
- Convert.cs
- Origine:
- Convert.cs
- Origine:
- Convert.cs
La chiamata a questo metodo genera sempre 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
Carattere Unicode da convertire.
Restituisce
Questa conversione non è supportata. Non viene restituito alcun valore.
Eccezioni
Questa conversione non è supportata.
Vedi anche
Si applica a
- Origine:
- Convert.cs
- Origine:
- Convert.cs
- Origine:
- Convert.cs
Converte il valore dell'intero senza segno a 8 bit specificato nel numero a virgola mobile a precisione singola equivalente.
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
Intero senza segno a 8 bit da convertire.
Restituisce
Numero a virgola mobile e precisione singola equivalente a value
.
Esempio
Nell'esempio seguente ogni elemento di una matrice di valori di byte viene convertito in un valore Single.
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.
let numbers = [| Byte.MinValue; 10uy; 100uy; Byte.MaxValue |]
for number in numbers do
let result = Convert.ToSingle number
printfn $"Converted the {number.GetType().Name} value {number} to the {result.GetType().Name} value {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.
Si applica a
- Origine:
- Convert.cs
- Origine:
- Convert.cs
- Origine:
- Convert.cs
Converte il valore booleano specificato nel numero a virgola mobile a precisione singola equivalente.
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
Valore booleano da convertire.
Restituisce
Numero 1 se value
è true
; in caso contrario, 0.
Esempio
Nell'esempio seguente i valori booleani true
e false
in valori Single.
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.
let flags = [| true; false |]
for flag in flags do
let result = Convert.ToSingle flag
printfn $"Converted {flag} to {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.
Si applica a
- Origine:
- Convert.cs
- Origine:
- Convert.cs
- Origine:
- Convert.cs
Converte il valore dell'intero con segno a 64 bit specificato in un numero a virgola mobile a precisione singola equivalente.
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
Intero con segno a 64 bit da convertire.
Restituisce
Numero a virgola mobile e precisione singola equivalente a value
.
Esempio
Nell'esempio seguente ogni elemento di una matrice di numeri interi lunghi viene convertito in un valore Single.
long[] numbers = { Int64.MinValue, -903, 0, 172, Int64.MaxValue};
float result;
foreach (long 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 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.
let numbers =
[| Int64.MinValue; -903; 0; 172; Int64.MaxValue |]
for number in numbers do
let result = Convert.ToSingle number
printfn $"Converted the {number.GetType().Name} value {number} to the {result.GetType().Name} value {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.
' 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.
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