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TimeSpan.FromMilliseconds 方法

2013/12/13

返回表示指定毫秒数的 TimeSpan

Namespace:  System
程序集:  mscorlib(位于 mscorlib.dll 中)
public static TimeSpan FromMilliseconds(
	double value
)

参数

value
类型: System.Double
毫秒数。

返回值

类型: System.TimeSpan
表示 value 的对象。
异常条件
OverflowException

value 小于 MinValue 或大于 MaxValue

- 或 -

valueDouble.PositiveInfinity

- 或 -

valueDouble.NegativeInfinity

ArgumentException

value 等于 Double.NaN

value 参数转换为刻度数,而该刻度数用于初始化新的 TimeSpan。因此,只认为 value 精确到最近的毫秒。请注意,由于 Double 数据类型的精度丢失,对接近但仍处于 MinValueMaxValue 范围内的值,此转换会生成 OverflowException。例如,在下列实例化 TimeSpan 对象的尝试中,这会导致 OverflowException


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


下面的代码示例使用 FromMilliseconds 方法创建几个 TimeSpan 对象。


// Example of the TimeSpan.FromMilliseconds( double ) method.
using System;

class Example
{
   static void GenTimeSpanFromMillisec(System.Windows.Controls.TextBlock outputBlock, 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 += "        ";

      outputBlock.Text += String.Format("{0,21}{1,26}", millisec, timeInterval) + "\n";
   }

   public static void Demo(System.Windows.Controls.TextBlock outputBlock)
   {
      outputBlock.Text += 
          "This example of TimeSpan.FromMilliseconds( " +
          "double )\ngenerates the following output.\n" + "\n";
      outputBlock.Text += "{0,21}{1,18}",
          "FromMilliseconds", "TimeSpan" + "\n";
      outputBlock.Text += "{0,21}{1,18}",
          "----------------", "--------" + "\n";

      GenTimeSpanFromMillisec(outputBlock, 1);
      GenTimeSpanFromMillisec(outputBlock, 1.5);
      GenTimeSpanFromMillisec(outputBlock, 12345.6);
      GenTimeSpanFromMillisec(outputBlock, 123456789.8);
      GenTimeSpanFromMillisec(outputBlock, 1234567898765.4);
      GenTimeSpanFromMillisec(outputBlock, 1000);
      GenTimeSpanFromMillisec(outputBlock, 60000);
      GenTimeSpanFromMillisec(outputBlock, 3600000);
      GenTimeSpanFromMillisec(outputBlock, 86400000);
      GenTimeSpanFromMillisec(outputBlock, 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
*/


Windows Phone OS

受以下版本支持: 8.0, 7.1, 7.0

Windows Phone

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