TimeSpan.FromSeconds(Double) Metodo

Definizione

Restituisce un oggetto TimeSpan che rappresenta un numero di secondi specificato, in cui la specifica è approssimata al millisecondo più vicino.Returns a TimeSpan that represents a specified number of seconds, where the specification is accurate to the nearest millisecond.

public:
 static TimeSpan FromSeconds(double value);
public static TimeSpan FromSeconds (double value);
static member FromSeconds : double -> TimeSpan
Public Shared Function FromSeconds (value As Double) As TimeSpan

Parametri

value
Double

Numero di secondi, approssimato al millisecondo più vicino.A number of seconds, accurate to the nearest millisecond.

Restituisce

Oggetto che rappresenta l'oggetto value.An object that represents value.

Eccezioni

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

-oppure--or- value è PositiveInfinity.value is PositiveInfinity.

In alternativa-or- value è NegativeInfinity.value is NegativeInfinity.

value è uguale a NaN.value is equal to NaN.

Esempi

Nell'esempio seguente vengono creati TimeSpan diversi oggetti usando FromSeconds il metodo.The following example creates several TimeSpan objects using the FromSeconds method.

// Example of the TimeSpan::FromSeconds( double ) method.
using namespace System;
void GenTimeSpanFromSeconds( double seconds )
{
   
   // Create a TimeSpan object and TimeSpan string from 
   // a number of seconds.
   TimeSpan interval = TimeSpan::FromSeconds( seconds );
   String^ timeInterval = interval.ToString();
   
   // Pad the end of the TimeSpan string with spaces if it 
   // does not contain milliseconds.
   int pIndex = timeInterval->IndexOf( ':' );
   pIndex = timeInterval->IndexOf( '.', pIndex );
   if ( pIndex < 0 )
      timeInterval = String::Concat( timeInterval, "        " );

   Console::WriteLine( "{0,21}{1,26}", seconds, timeInterval );
}

int main()
{
   Console::WriteLine( "This example of TimeSpan::FromSeconds( double )\n"
   "generates the following output.\n" );
   Console::WriteLine( "{0,21}{1,18}", "FromSeconds", "TimeSpan" );
   Console::WriteLine( "{0,21}{1,18}", "-----------", "--------" );
   GenTimeSpanFromSeconds( 0.001 );
   GenTimeSpanFromSeconds( 0.0015 );
   GenTimeSpanFromSeconds( 12.3456 );
   GenTimeSpanFromSeconds( 123456.7898 );
   GenTimeSpanFromSeconds( 1234567898.7654 );
   GenTimeSpanFromSeconds( 1 );
   GenTimeSpanFromSeconds( 60 );
   GenTimeSpanFromSeconds( 3600 );
   GenTimeSpanFromSeconds( 86400 );
   GenTimeSpanFromSeconds( 1801220.2 );
}

/*
This example of TimeSpan::FromSeconds( double )
generates the following output.

          FromSeconds          TimeSpan
          -----------          --------
                0.001          00:00:00.0010000
               0.0015          00:00:00.0020000
              12.3456          00:00:12.3460000
          123456.7898        1.10:17:36.7900000
      1234567898.7654    14288.23:31:38.7650000
                    1          00:00:01
                   60          00:01:00
                 3600          01:00:00
                86400        1.00:00:00
            1801220.2       20.20:20:20.2000000
*/
// Example of the TimeSpan.FromSeconds( double ) method.
using System;

class FromSecondsDemo
{
    static void GenTimeSpanFromSeconds( double seconds )
    {
        // Create a TimeSpan object and TimeSpan string from 
        // a number of seconds.
        TimeSpan    interval = TimeSpan.FromSeconds( seconds );
        string      timeInterval = interval.ToString( );

        // Pad the end of the TimeSpan string with spaces if it 
        // does not contain milliseconds.
        int pIndex = timeInterval.IndexOf( ':' );
        pIndex = timeInterval.IndexOf( '.', pIndex );
        if( pIndex < 0 )   timeInterval += "        ";

        Console.WriteLine( "{0,21}{1,26}", seconds, timeInterval );
    } 

    static void Main( )
    {
        Console.WriteLine(
            "This example of TimeSpan.FromSeconds( double )\n" +
            "generates the following output.\n" );
        Console.WriteLine( "{0,21}{1,18}",
            "FromSeconds", "TimeSpan" );
        Console.WriteLine( "{0,21}{1,18}", 
            "-----------", "--------" );

        GenTimeSpanFromSeconds( 0.001 );
        GenTimeSpanFromSeconds( 0.0015 );
        GenTimeSpanFromSeconds( 12.3456 );
        GenTimeSpanFromSeconds( 123456.7898 );
        GenTimeSpanFromSeconds( 1234567898.7654 );
        GenTimeSpanFromSeconds( 1 );
        GenTimeSpanFromSeconds( 60 );
        GenTimeSpanFromSeconds( 3600 );
        GenTimeSpanFromSeconds( 86400 );
        GenTimeSpanFromSeconds( 1801220.2 );
    } 
} 

/*
This example of TimeSpan.FromSeconds( double )
generates the following output.

          FromSeconds          TimeSpan
          -----------          --------
                0.001          00:00:00.0010000
               0.0015          00:00:00.0020000
              12.3456          00:00:12.3460000
          123456.7898        1.10:17:36.7900000
      1234567898.7654    14288.23:31:38.7650000
                    1          00:00:01
                   60          00:01:00
                 3600          01:00:00
                86400        1.00:00:00
            1801220.2       20.20:20:20.2000000
*/ 
' Example of the TimeSpan.FromSeconds( Double ) method.
Module FromSecondsDemo

    Sub GenTimeSpanFromSeconds( seconds As Double )

        ' Create a TimeSpan object and TimeSpan string from 
        ' a number of seconds.
        Dim interval As TimeSpan = _
            TimeSpan.FromSeconds( seconds )
        Dim timeInterval As String = interval.ToString( )

        ' Pad the end of the TimeSpan string with spaces if it 
        ' does not contain milliseconds.
        Dim pIndex As Integer = timeInterval.IndexOf( ":"c )
        pIndex = timeInterval.IndexOf( "."c, pIndex )
        If pIndex < 0 Then   timeInterval &= "        "

        Console.WriteLine( "{0,21}{1,26}", seconds, timeInterval )
    End Sub 

    Sub Main( )

        Console.WriteLine( "This example of " & _
            "TimeSpan.FromSeconds( Double )" & _
            vbCrLf & "generates the following output." & vbCrLf )
        Console.WriteLine( "{0,21}{1,18}", _
            "FromSeconds", "TimeSpan" )    
        Console.WriteLine( "{0,21}{1,18}", _
            "-----------", "--------" )    

        GenTimeSpanFromSeconds( 0.001 )
        GenTimeSpanFromSeconds( 0.0015 )
        GenTimeSpanFromSeconds( 12.3456 )
        GenTimeSpanFromSeconds( 123456.7898 )
        GenTimeSpanFromSeconds( 1234567898.7654 )
        GenTimeSpanFromSeconds( 1 )
        GenTimeSpanFromSeconds( 60 )
        GenTimeSpanFromSeconds( 3600 )
        GenTimeSpanFromSeconds( 86400 )
        GenTimeSpanFromSeconds( 1801220.2 )
    End Sub
End Module 

' This example of TimeSpan.FromSeconds( Double )
' generates the following output.
' 
'           FromSeconds          TimeSpan
'           -----------          --------
'                 0.001          00:00:00.0010000
'                0.0015          00:00:00.0020000
'               12.3456          00:00:12.3460000
'           123456.7898        1.10:17:36.7900000
'       1234567898.7654    14288.23:31:38.7650000
'                     1          00:00:01
'                    60          00:01:00
'                  3600          01:00:00
'                 86400        1.00:00:00
'             1801220.2       20.20:20:20.2000000

Commenti

Il value parametro viene convertito in millisecondi, che viene convertito in cicli e il numero di cicli viene usato per inizializzare il nuovo TimeSpan.The value parameter is converted to milliseconds, which is converted to ticks, and that number of ticks is used to initialize the new TimeSpan. Pertanto, value verrà considerato accurato solo per il millisecondo più vicino.Therefore, value will only be considered accurate to the nearest millisecond. Si noti che, a causa della perdita di precisione del Double tipo di dati, questo può generare OverflowException un oggetto per i valori che si trovano quasi ma ancora MinValue nell'intervallo MaxValuedi o, ovvero la causa di OverflowExceptionun, ad esempio, nel seguente tentativo di creare un'istanza TimeSpan di un oggetto.Note that, because of the loss of precision of the Double data type, this can generate an OverflowException for values that are near but still in the range of either MinValue or MaxValue, This is the cause of an OverflowException, for example, in the following attempt to instantiate a TimeSpan object.

// The following throws an OverflowException at runtime
TimeSpan maxSpan = TimeSpan.FromSeconds(TimeSpan.MaxValue.TotalSeconds);
' The following throws an OverflowException at runtime
Dim maxSpan As TimeSpan = TimeSpan.FromSeconds(TimeSpan.MaxValue.TotalSeconds)

Si applica a

Vedi anche