TimeSpan.FromHours Method
Microsoft Silverlight will reach end of support after October 2021. Learn more.
Returns a TimeSpan that represents a specified number of hours, where the specification is accurate to the nearest millisecond.
Namespace: System
Assembly: mscorlib (in mscorlib.dll)
Syntax
'Declaration
Public Shared Function FromHours ( _
value As Double _
) As TimeSpan
public static TimeSpan FromHours(
double value
)
Parameters
- value
Type: System.Double
A number of hours, accurate to the nearest millisecond.
Return Value
Type: System.TimeSpan
An object that represents value.
Exceptions
| Exception | Condition |
|---|---|
| OverflowException | value is less than MinValue or greater than MaxValue. -or- value is Double.PositiveInfinity. -or- value is Double.NegativeInfinity. |
| ArgumentException | value is equal to Double.NaN. |
Remarks
The value parameter is converted to milliseconds, which is converted to ticks, and that number of ticks is used to initialize the new TimeSpan. Therefore, value will only be considered accurate to the nearest millisecond. 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. For example, this causes an OverflowException in the following attempt to instantiate a TimeSpan object.
' The following throws an OverflowException at runtime
Dim maxSpan As TimeSpan = TimeSpan.FromHours(TimeSpan.MaxValue.TotalHours)
// The following throws an OverflowException at runtime
TimeSpan maxSpan = TimeSpan.FromHours(TimeSpan.MaxValue.TotalHours);
Examples
The following code example creates several TimeSpan objects using the FromHours method.
' Example of the TimeSpan.FromHours( Double ) method.
Module Example
Sub GenTimeSpanFromHours(ByVal outputBlock As System.Windows.Controls.TextBlock, ByVal 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 &= " "
outputBlock.Text &= String.Format("{0,21}{1,26}", hours, timeInterval) & vbCrLf
End Sub
Public Sub Demo(ByVal outputBlock As System.Windows.Controls.TextBlock)
outputBlock.Text &= "This example of " & _
"TimeSpan.FromHours( Double )" & _
vbCrLf & "generates the following output." & vbCrLf & vbCrLf
outputBlock.Text &= "{0,21}{1,18}", _
"FromHours", "TimeSpan" & vbCrLf
outputBlock.Text &= "{0,21}{1,18}", _
"---------", "--------" & vbCrLf
GenTimeSpanFromHours(outputBlock, 0.0000002)
GenTimeSpanFromHours(outputBlock, 0.0000003)
GenTimeSpanFromHours(outputBlock, 0.0012345)
GenTimeSpanFromHours(outputBlock, 12.3456789)
GenTimeSpanFromHours(outputBlock, 123456.7898765)
GenTimeSpanFromHours(outputBlock, 0.0002777)
GenTimeSpanFromHours(outputBlock, 0.0166666)
GenTimeSpanFromHours(outputBlock, 1)
GenTimeSpanFromHours(outputBlock, 24)
GenTimeSpanFromHours(outputBlock, 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
// Example of the TimeSpan.FromHours( double ) method.
using System;
class Example
{
static void GenTimeSpanFromHours(System.Windows.Controls.TextBlock outputBlock, 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 += " ";
outputBlock.Text += String.Format("{0,21}{1,26}", hours, timeInterval) + "\n";
}
public static void Demo(System.Windows.Controls.TextBlock outputBlock)
{
outputBlock.Text +=
"This example of TimeSpan.FromHours( double )\n" +
"generates the following output.\n" + "\n";
outputBlock.Text += "{0,21}{1,18}",
"FromHours", "TimeSpan" + "\n";
outputBlock.Text += "{0,21}{1,18}",
"---------", "--------" + "\n";
GenTimeSpanFromHours(outputBlock, 0.0000002);
GenTimeSpanFromHours(outputBlock, 0.0000003);
GenTimeSpanFromHours(outputBlock, 0.0012345);
GenTimeSpanFromHours(outputBlock, 12.3456789);
GenTimeSpanFromHours(outputBlock, 123456.7898765);
GenTimeSpanFromHours(outputBlock, 0.0002777);
GenTimeSpanFromHours(outputBlock, 0.0166666);
GenTimeSpanFromHours(outputBlock, 1);
GenTimeSpanFromHours(outputBlock, 24);
GenTimeSpanFromHours(outputBlock, 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
*/
Version Information
Silverlight
Supported in: 5, 4, 3
Silverlight for Windows Phone
Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0
XNA Framework
Supported in: Xbox 360, Windows Phone OS 7.0
Platforms
For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.
See Also