Articolo
11/18/2011

DateTimeOffset.LessThanOrEqual Operator

Microsoft Silverlight will reach end of support after October 2021. Learn more.

Determines whether one specified DateTimeOffset object is less than a second specified DateTimeOffset object.

Namespace: System
Assembly: mscorlib (in mscorlib.dll)

Syntax

'Declaration
Public Shared Operator <= ( _
    left As DateTimeOffset, _
    right As DateTimeOffset _
) As Boolean

public static bool operator <=(
    DateTimeOffset left,
    DateTimeOffset right
)

Parameters

left
Type: System.DateTimeOffset
The first object to compare.

right
Type: System.DateTimeOffset
The second object to compare.

Return Value

Type: System.Boolean
true if the UtcDateTime value of left is earlier than the UtcDateTime value of right; otherwise, false.

Remarks

The LessThanOrEqual method defines the operation of the less than or equal to operator for DateTimeOffset objects. It enables code such as the following:

Dim date1 As New DateTimeOffset(#6/3/2007 2:45:00 PM#, _
             New TimeSpan(-7, 0, 0))
Dim date2 As New DateTimeOffset(#6/3/2007 3:45:00 PM#, _
             New TimeSpan(-7, 0, 0))
Dim date3 As New DateTimeOffset(date1.DateTime, _
             New TimeSpan(-6, 0, 0))
Dim date4 As DateTimeOffset = date1
outputBlock.Text &= (date1 <= date2) & vbCrLf        ' Displays True
outputBlock.Text &= (date1 <= date3) & vbCrLf        ' Displays False
outputBlock.Text &= (date1 <= date4) & vbCrLf        ' Displays True

DateTimeOffset date1 = new DateTimeOffset(2007, 6, 3, 14, 45, 0,
             new TimeSpan(-7, 0, 0));
DateTimeOffset date2 = new DateTimeOffset(2007, 6, 3, 15, 45, 0,
             new TimeSpan(-7, 0, 0));
DateTimeOffset date3 = new DateTimeOffset(date1.DateTime,
             new TimeSpan(-6, 0, 0));
DateTimeOffset date4 = date1;
outputBlock.Text += (date1 <= date2) + "\n";        // Displays True
outputBlock.Text += (date1 <= date3) + "\n";        // Displays False 
outputBlock.Text += (date1 <= date4) + "\n";        // Displays True

Languages that do not support custom operators can call the Compare method instead. Some languages can also call the LessThanOrEqual method directly, as the following example shows.

Dim date1 As New DateTimeOffset(#6/3/2007 2:45:00 PM#, _
             New TimeSpan(-7, 0, 0))
Dim date2 As New DateTimeOffset(#6/3/2007 3:45:00 PM#, _
             New TimeSpan(-7, 0, 0))
Dim date3 As New DateTimeOffset(date1.DateTime, _
             New TimeSpan(-6, 0, 0))
Dim date4 As DateTimeOffset = date1
outputBlock.Text += DateTimeOffset.op_LessThanOrEqual(date1, date2).ToString() & vbCrLf   ' Displays True
outputBlock.Text += DateTimeOffset.op_LessThanOrEqual(date1, date3).ToString() & vbCrLf ' Displays False
outputBlock.Text += DateTimeOffset.op_LessThanOrEqual(date1, date4).ToString() & vbCrLf ' Displays True

Before evaluating the left and right operands, the operator converts both values to Coordinated Universal Time (UTC). The operation is equivalent to the following:

Return left.UtcDateTime <= right.UtcDateTime

return left.UtcDateTime <= right.UtcDateTime;

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.

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