TimeSpan.FromSeconds(Double) 方法

定义

返回表示指定秒数的 TimeSpan,其中对秒数的指定精确到最接近的毫秒。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

参数

value
Double

秒数,精确到最接近的毫秒。A number of seconds, accurate to the nearest millisecond.

返回

TimeSpan

表示 value 的对象。An object that represents value.

例外

value 小于 MinValue 或大于 MaxValuevalue is less than MinValue or greater than MaxValue.

- 或 --or- valuePositiveInfinityvalue is PositiveInfinity.

-or- valueNegativeInfinityvalue is NegativeInfinity.

value 等于 NaNvalue is equal to NaN.

示例

下面的示例使用方法创建几个 TimeSpan 对象 FromSecondsThe 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

注解

value参数转换为毫秒,转换为计时周期,并使用该计时周期数来初始化新的 TimeSpanThe value parameter is converted to milliseconds, which is converted to ticks, and that number of ticks is used to initialize the new TimeSpan. 因此, value 将只视为精确到最接近的毫秒。Therefore, value will only be considered accurate to the nearest millisecond. 请注意,由于数据类型的精度丢失 Double ,这可能会 OverflowException 为接近但仍在或的范围内的值生成 MinValue MaxValue ,这就是的原因, OverflowException 例如,尝试实例化 TimeSpan 对象。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)

适用于

另请参阅