# TimeSpan.FromHours(Double) メソッド

## 定義

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

#### パラメーター

value
Double

ミリ秒単位の精度による時間数。A number of hours accurate to the nearest millisecond.

#### 戻り値

`value` を表すオブジェクト。An object that represents `value`.

#### 例外

`value`MinValue 未満であるか、MaxValue を超えています。`value` is less than MinValue or greater than MaxValue.

または-or- `value`PositiveInfinity です。`value` is PositiveInfinity.

または-or- `value`NegativeInfinity です。`value` is NegativeInfinity.

`value`NaN が等価です。`value` is equal to NaN.

## 例

``````// Example of the TimeSpan::FromHours( double ) method.
using namespace System;
void GenTimeSpanFromHours( double hours )
{

// Create a TimeSpan object and TimeSpan string from
// a number of hours.
TimeSpan interval = TimeSpan::FromHours( hours );
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}", hours, timeInterval );
}

int main()
{
Console::WriteLine( "This example of TimeSpan::FromHours( double )\n"
"generates the following output.\n" );
Console::WriteLine( "{0,21}{1,18}", "FromHours", "TimeSpan" );
Console::WriteLine( "{0,21}{1,18}", "---------", "--------" );
GenTimeSpanFromHours( 0.0000002 );
GenTimeSpanFromHours( 0.0000003 );
GenTimeSpanFromHours( 0.0012345 );
GenTimeSpanFromHours( 12.3456789 );
GenTimeSpanFromHours( 123456.7898765 );
GenTimeSpanFromHours( 0.0002777 );
GenTimeSpanFromHours( 0.0166666 );
GenTimeSpanFromHours( 1 );
GenTimeSpanFromHours( 24 );
GenTimeSpanFromHours( 500.3389445 );
}

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

FromHours          TimeSpan
---------          --------
2E-07          00:00:00.0010000
3E-07          00:00:00.0010000
0.0012345          00:00:04.4440000
12.3456789          12:20:44.4440000
123456.7898765     5144.00:47:23.5550000
0.0002777          00:00:01
0.0166666          00:01:00
1          01:00:00
24        1.00:00:00
500.3389445       20.20:20:20.2000000
*/
``````
``````// Example of the TimeSpan.FromHours( double ) method.
using System;

class FromHoursDemo
{
static void GenTimeSpanFromHours( double hours )
{
// Create a TimeSpan object and TimeSpan string from
// a number of hours.
TimeSpan    interval = TimeSpan.FromHours( hours );
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}", hours, timeInterval );
}

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

GenTimeSpanFromHours( 0.0000002 );
GenTimeSpanFromHours( 0.0000003 );
GenTimeSpanFromHours( 0.0012345 );
GenTimeSpanFromHours( 12.3456789 );
GenTimeSpanFromHours( 123456.7898765 );
GenTimeSpanFromHours( 0.0002777 );
GenTimeSpanFromHours( 0.0166666 );
GenTimeSpanFromHours( 1 );
GenTimeSpanFromHours( 24 );
GenTimeSpanFromHours( 500.3389445 );
}
}

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

FromHours          TimeSpan
---------          --------
2E-07          00:00:00.0010000
3E-07          00:00:00.0010000
0.0012345          00:00:04.4440000
12.3456789          12:20:44.4440000
123456.7898765     5144.00:47:23.5550000
0.0002777          00:00:01
0.0166666          00:01:00
1          01:00:00
24        1.00:00:00
500.3389445       20.20:20:20.2000000
*/
``````
``````' Example of the TimeSpan.FromHours( Double ) method.
Module FromHoursDemo

Sub GenTimeSpanFromHours( hours As Double )

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

Sub Main( )

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

GenTimeSpanFromHours( 0.0000002 )
GenTimeSpanFromHours( 0.0000003 )
GenTimeSpanFromHours( 0.0012345 )
GenTimeSpanFromHours( 12.3456789 )
GenTimeSpanFromHours( 123456.7898765 )
GenTimeSpanFromHours( 0.0002777 )
GenTimeSpanFromHours( 0.0166666 )
GenTimeSpanFromHours( 1 )
GenTimeSpanFromHours( 24 )
GenTimeSpanFromHours( 500.3389445 )
End Sub
End Module

' This example of TimeSpan.FromHours( Double )
' generates the following output.
'
'             FromHours          TimeSpan
'             ---------          --------
'                 2E-07          00:00:00.0010000
'                 3E-07          00:00:00.0010000
'             0.0012345          00:00:04.4440000
'            12.3456789          12:20:44.4440000
'        123456.7898765     5144.00:47:23.5550000
'             0.0002777          00:00:01
'             0.0166666          00:01:00
'                     1          01:00:00
'                    24        1.00:00:00
'           500.3389445       20.20:20:20.2000000
``````

## 注釈

`value` パラメーターは、タイマー刻みに変換されるミリ秒に変換され、このタイマー刻みの数を使用して新しい TimeSpanが初期化されます。The `value` parameter is converted to milliseconds, which is converted to ticks, and that number of ticks is used to initialize the new TimeSpan. したがって、`value` は、ミリ秒単位で正確に見なされます。Therefore, `value` will only be considered accurate to the nearest millisecond. Double データ型の精度が失われているため、この変換では、の近くにあり、MinValue または MaxValueの範囲内にある値に対して OverflowException が生成される可能性があることに注意してください。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. たとえば、次のような場合に、TimeSpan オブジェクトをインスタンス化しようとすると OverflowException が発生します。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.FromHours(TimeSpan.MaxValue.TotalHours);
``````
``````' The following throws an OverflowException at runtime
Dim maxSpan As TimeSpan = TimeSpan.FromHours(TimeSpan.MaxValue.TotalHours)
``````