Artigo
11/17/2011

XElement Explicit Conversion (XElement to Nullable<DateTimeOffset>)

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

Cast the value of this XElement to a Nullable<T> of DateTimeOffset.

This API is not CLS-compliant.

Namespace: System.Xml.Linq
Assembly: System.Xml.Linq (in System.Xml.Linq.dll)

Syntax

'Declaration
Public Shared Narrowing Operator CType ( _
    element As XElement _
) As Nullable(Of DateTimeOffset)

public static explicit operator Nullable<DateTimeOffset> (
    XElement element
)

Parameters

element
Type: System.Xml.Linq.XElement
The XElement to cast to an Nullable<T> of DateTimeOffset.

Return Value

Type: System.Nullable<DateTimeOffset>
A Nullable<T> of DateTimeOffset that contains the content of this XElement.

Exceptions

Exception	Condition
FormatException	The element does not contain a valid DateTimeOffset value.

Remarks

This conversion operator uses the XmlConvert class to do the conversion.

Examples

The following example creates an element with date and time content. It then casts to Nullable<T> of DateTimeOffset to retrieve the value.

Dim output As New StringBuilder
Dim root As XElement = _
    <Root>
        <Child><%= New DateTimeOffset(New DateTime(2006, 10, 6, 12, 30, 0)) %></Child>
    </Root>
output.Append(root)
output.Append(Environment.NewLine)

Dim dt As Nullable(Of DateTimeOffset) = CType(root.<Child>(0), Nullable(Of DateTimeOffset))
output.Append(String.Format("dt={0}", dt))
output.Append(Environment.NewLine)

OutputTextBlock.Text = output.ToString()

StringBuilder output = new StringBuilder();
XElement root = new XElement("Root",
    new XElement("Child", new DateTimeOffset(new DateTime(2006, 10, 6, 12, 30, 0)))
);
output.Append(root + Environment.NewLine);

DateTimeOffset? dt = (DateTimeOffset?)root.Element("Child");
output.Append("dt=" + dt + Environment.NewLine);

OutputTextBlock.Text = output.ToString();

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.

Partilhar via