TimeSpan.FromDays(Double) 方法

定义

返回表示指定天数的 TimeSpan,其中对天数的指定精确到最接近的毫秒。

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

参数

value
Double

天数,精确到最接近的毫秒。

返回

表示 value 的对象。

例外

value 小于 TimeSpan.MinValue 或大于 TimeSpan.MaxValue

value 上声明的默认值为 PositiveInfinity

valueNegativeInfinity

value 等于 NaN

示例

以下示例使用 FromDays 方法创建多个 TimeSpan 对象。

// Example of the TimeSpan::FromDays( double ) method.
using namespace System;
void GenTimeSpanFromDays( double days )
{
   
   // Create a TimeSpan object and TimeSpan string from 
   // a number of days.
   TimeSpan interval = TimeSpan::FromDays( days );
   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}", days, timeInterval );
}

int main()
{
   Console::WriteLine( "This example of TimeSpan::FromDays( double )\n"
   "generates the following output.\n" );
   Console::WriteLine( "{0,21}{1,18}", "FromDays", "TimeSpan" );
   Console::WriteLine( "{0,21}{1,18}", "--------", "--------" );
   GenTimeSpanFromDays( 0.000000006 );
   GenTimeSpanFromDays( 0.000000017 );
   GenTimeSpanFromDays( 0.000123456 );
   GenTimeSpanFromDays( 1.234567898 );
   GenTimeSpanFromDays( 12345.678987654 );
   GenTimeSpanFromDays( 0.000011574 );
   GenTimeSpanFromDays( 0.000694444 );
   GenTimeSpanFromDays( 0.041666666 );
   GenTimeSpanFromDays( 1 );
   GenTimeSpanFromDays( 20.84745602 );
}

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

             FromDays          TimeSpan
             --------          --------
                6E-09          00:00:00.0010000
              1.7E-08          00:00:00.0010000
          0.000123456          00:00:10.6670000
          1.234567898        1.05:37:46.6660000
      12345.678987654    12345.16:17:44.5330000
           1.1574E-05          00:00:01
          0.000694444          00:01:00
          0.041666666          01:00:00
                    1        1.00:00:00
          20.84745602       20.20:20:20.2000000
*/
// Example of the TimeSpan.FromDays( double ) method.
using System;

class FromDaysDemo
{
    static void GenTimeSpanFromDays( double days )
    {
        // Create a TimeSpan object and TimeSpan string from 
        // a number of days.
        TimeSpan interval = TimeSpan.FromDays( days );
        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}", days, timeInterval );
    } 

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

        GenTimeSpanFromDays( 0.000000006 );
        GenTimeSpanFromDays( 0.000000017 );
        GenTimeSpanFromDays( 0.000123456 );
        GenTimeSpanFromDays( 1.234567898 );
        GenTimeSpanFromDays( 12345.678987654 );
        GenTimeSpanFromDays( 0.000011574 );
        GenTimeSpanFromDays( 0.000694444 );
        GenTimeSpanFromDays( 0.041666666 );
        GenTimeSpanFromDays( 1 );
        GenTimeSpanFromDays( 20.84745602 );
    } 
} 

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

             FromDays          TimeSpan
             --------          --------
                6E-09          00:00:00.0010000
              1.7E-08          00:00:00.0010000
          0.000123456          00:00:10.6670000
          1.234567898        1.05:37:46.6660000
      12345.678987654    12345.16:17:44.5330000
           1.1574E-05          00:00:01
          0.000694444          00:01:00
          0.041666666          01:00:00
                    1        1.00:00:00
          20.84745602       20.20:20:20.2000000
*/
// Example of the TimeSpan.FromDays( double ) method.
open System

let genTimeSpanFromDays days =
    // Create a TimeSpan object and TimeSpan string from 
    // a number of days.
    let interval = TimeSpan.FromDays days
    let timeInterval = string interval

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

    printfn $"{days,21}{timeInterval,26}"

printfn "This example of TimeSpan.FromDays( double )\ngenerates the following output.\n"
printfn "%21s%18s" "FromDays" "TimeSpan"
printfn "%21s%18s" "--------" "--------"

genTimeSpanFromDays 0.000000006
genTimeSpanFromDays 0.000000017
genTimeSpanFromDays 0.000123456
genTimeSpanFromDays 1.234567898
genTimeSpanFromDays 12345.678987654
genTimeSpanFromDays 0.000011574
genTimeSpanFromDays 0.000694444
genTimeSpanFromDays 0.041666666
genTimeSpanFromDays 1
genTimeSpanFromDays 20.84745602

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

             FromDays          TimeSpan
             --------          --------
                6E-09          00:00:00.0010000
              1.7E-08          00:00:00.0010000
          0.000123456          00:00:10.6670000
          1.234567898        1.05:37:46.6660000
      12345.678987654    12345.16:17:44.5330000
           1.1574E-05          00:00:01
          0.000694444          00:01:00
          0.041666666          01:00:00
                    1        1.00:00:00
          20.84745602       20.20:20:20.2000000
*)
' Example of the TimeSpan.FromDays( Double ) method.
Module FromDaysDemo

    Sub GenTimeSpanFromDays( days As Double )

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

    Sub Main( )

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

        GenTimeSpanFromDays( 0.000000006 )
        GenTimeSpanFromDays( 0.000000017 )
        GenTimeSpanFromDays( 0.000123456 )
        GenTimeSpanFromDays( 1.234567898 )
        GenTimeSpanFromDays( 12345.678987654 )
        GenTimeSpanFromDays( 0.000011574 )
        GenTimeSpanFromDays( 0.000694444 )
        GenTimeSpanFromDays( 0.041666666 )
        GenTimeSpanFromDays( 1 )
        GenTimeSpanFromDays( 20.84745602 )
    End Sub 
End Module 

' This example of TimeSpan.FromDays( Double )
' generates the following output.
' 
'              FromDays          TimeSpan
'              --------          --------
'                 6E-09          00:00:00.0010000
'               1.7E-08          00:00:00.0010000
'           0.000123456          00:00:10.6670000
'           1.234567898        1.05:37:46.6660000
'       12345.678987654    12345.16:17:44.5330000
'            1.1574E-05          00:00:01
'           0.000694444          00:01:00
'           0.041666666          01:00:00
'                     1        1.00:00:00
'           20.84745602       20.20:20:20.2000000

注解

参数 value 转换为毫秒(转换为计时周期),并且该时钟周期数用于初始化新的 TimeSpan。 因此, value 仅被视为精确到最接近的毫秒。 请注意,由于数据类型的精度Double损失,此转换可能会导致 OverflowException 的 值接近 ,但仍在 或 MaxValue的范围内MinValue。 例如,这会导致 OverflowException 在以下尝试中实例化 TimeSpan 对象。

// The following throws an OverflowException at runtime
TimeSpan maxSpan = TimeSpan.FromDays(TimeSpan.MaxValue.TotalDays);
// The following throws an OverflowException at runtime
let maxSpan = TimeSpan.FromDays TimeSpan.MaxValue.TotalDays
' The following throws an OverflowException at runtime
Dim maxSpan As TimeSpan = TimeSpan.FromDays(TimeSpan.MaxValue.TotalDays)

适用于

另请参阅