TimeSpan.FromMilliseconds(Double) TimeSpan.FromMilliseconds(Double) TimeSpan.FromMilliseconds(Double) TimeSpan.FromMilliseconds(Double) Method

定义

返回表示指定毫秒数的 TimeSpanReturns a TimeSpan that represents a specified number of milliseconds.

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

参数

value
Double Double Double Double

毫秒数。A number of milliseconds.

返回

表示 value 的对象。An object that represents value.

异常

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.

示例

下面的示例FromMilliseconds使用方法TimeSpan创建几个对象。The following example creates several TimeSpan objects by using the FromMilliseconds method.

// Example of the TimeSpan::FromMilliseconds( double ) method.
using namespace System;
void GenTimeSpanFromMillisec( Double millisec )
{
   
   // Create a TimeSpan object and TimeSpan string from 
   // a number of milliseconds.
   TimeSpan interval = TimeSpan::FromMilliseconds( millisec );
   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}", millisec, timeInterval );
}

int main()
{
   Console::WriteLine( "This example of TimeSpan::FromMilliseconds( double )\n"
   "generates the following output.\n" );
   Console::WriteLine( "{0,21}{1,18}", "FromMilliseconds", "TimeSpan" );
   Console::WriteLine( "{0,21}{1,18}", "----------------", "--------" );
   GenTimeSpanFromMillisec( 1 );
   GenTimeSpanFromMillisec( 1.5 );
   GenTimeSpanFromMillisec( 12345.6 );
   GenTimeSpanFromMillisec( 123456789.8 );
   GenTimeSpanFromMillisec( 1234567898765.4 );
   GenTimeSpanFromMillisec( 1000 );
   GenTimeSpanFromMillisec( 60000 );
   GenTimeSpanFromMillisec( 3600000 );
   GenTimeSpanFromMillisec( 86400000 );
   GenTimeSpanFromMillisec( 1801220200 );
}

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

     FromMilliseconds          TimeSpan
     ----------------          --------
                    1          00:00:00.0010000
                  1.5          00:00:00.0020000
              12345.6          00:00:12.3460000
          123456789.8        1.10:17:36.7900000
      1234567898765.4    14288.23:31:38.7650000
                 1000          00:00:01
                60000          00:01:00
              3600000          01:00:00
             86400000        1.00:00:00
           1801220200       20.20:20:20.2000000
*/
// Example of the TimeSpan.FromMilliseconds( double ) method.
using System;

class FromMillisecDemo
{
    static void GenTimeSpanFromMillisec( Double millisec )
    {
        // Create a TimeSpan object and TimeSpan string from 
        // a number of milliseconds.
        TimeSpan    interval = TimeSpan.FromMilliseconds( millisec );
        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}", millisec, timeInterval );
    } 

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

        GenTimeSpanFromMillisec( 1 );
        GenTimeSpanFromMillisec( 1.5 );
        GenTimeSpanFromMillisec( 12345.6 );
        GenTimeSpanFromMillisec( 123456789.8 );
        GenTimeSpanFromMillisec( 1234567898765.4 );
        GenTimeSpanFromMillisec( 1000 );
        GenTimeSpanFromMillisec( 60000 );
        GenTimeSpanFromMillisec( 3600000 );
        GenTimeSpanFromMillisec( 86400000 );
        GenTimeSpanFromMillisec( 1801220200 );
    } 
} 

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

     FromMilliseconds          TimeSpan
     ----------------          --------
                    1          00:00:00.0010000
                  1.5          00:00:00.0020000
              12345.6          00:00:12.3460000
          123456789.8        1.10:17:36.7900000
      1234567898765.4    14288.23:31:38.7650000
                 1000          00:00:01
                60000          00:01:00
              3600000          01:00:00
             86400000        1.00:00:00
           1801220200       20.20:20:20.2000000
*/
' Example of the TimeSpan.FromMilliseconds( Double ) method.
Imports System
Imports Microsoft.VisualBasic

Module FromMillisecDemo

    Sub GenTimeSpanFromMillisec( millisec As Double )

        ' Create a TimeSpan object and TimeSpan string from 
        ' a number of milliseconds.
        Dim interval As TimeSpan = _
            TimeSpan.FromMilliseconds( millisec )
        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}", millisec, timeInterval )
    End Sub 

    Sub Main( )

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

        GenTimeSpanFromMillisec( 1 )
        GenTimeSpanFromMillisec( 1.5 )
        GenTimeSpanFromMillisec( 12345.6 )
        GenTimeSpanFromMillisec( 123456789.8 )
        GenTimeSpanFromMillisec( 1234567898765.4 )
        GenTimeSpanFromMillisec( 1000 )
        GenTimeSpanFromMillisec( 60000 )
        GenTimeSpanFromMillisec( 3600000 )
        GenTimeSpanFromMillisec( 86400000 )
        GenTimeSpanFromMillisec( 1801220200 )
    End Sub 
End Module 

' This example of TimeSpan.FromMilliseconds( Double )
' generates the following output.
' 
'      FromMilliseconds          TimeSpan
'      ----------------          --------
'                     1          00:00:00.0010000
'                   1.5          00:00:00.0020000
'               12345.6          00:00:12.3460000
'           123456789.8        1.10:17:36.7900000
'       1234567898765.4    14288.23:31:38.7650000
'                  1000          00:00:01
'                 60000          00:01:00
'               3600000          01:00:00
'              86400000        1.00:00:00
'            1801220200       20.20:20:20.2000000

注解

参数转换为计时周期, 并使用该刻度数来初始化新TimeSpan的。 valueThe value parameter 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. Double请注意, 由于数据类型的精度丢失, 此转换可以OverflowException为接近但仍MinValue处于或MaxValue范围内的值生成。Note that, because of the loss of precision of the Double data type, this conversion can generate an OverflowException for values that are near to but still in the range of either MinValue or MaxValue. 例如, OverflowException在以下情况下, 这会导致尝试TimeSpan实例化对象。For example, this causes an OverflowException in the following attempt to instantiate a TimeSpan object.

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

适用于

另请参阅