XAttribute Narrowing Conversion (XAttribute to Nullable(Of TimeSpan))

equivalentCodeEntityop_Explicit(XAttribute attribute)

Cast the value of this XAttribute to a Nullable(Of T) of TimeSpan.

This API is not CLS-compliant.

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

Public Shared Narrowing Operator CType (
	attribute As XAttribute
) As Nullable(Of TimeSpan)


Type: System.Xml.Linq.XAttribute

The XAttribute to cast to a Nullable(Of T) of TimeSpan.

Return Value

Type: System.Nullable(Of TimeSpan)

A Nullable(Of T) of TimeSpan that contains the content of this XAttribute.

Exception Condition

The attribute does not contain a valid TimeSpan value.

The value space of an attribute or element that contains time span content is closely related to duration content as described in ISO 8601. When creating an attribute or element that contains time span content, the attribute or element values are formatted per the W3C specification. Please see the W3C specification for more details.

Behavior is lax when casting to a Nullable(Of T) of TimeSpan from an attribute or element. Even if the attribute or element value is not formatted exactly per the W3C specification, the value is appropriately converted to a Nullable(Of T) of TimeSpan.

The following example creates an attribute with time span content. It then retrieves the value by casting to Nullable(Of T) of TimeSpan.

                Dim root As XElement = <Root Att=<%= New TimeSpan(1, 5, 30) %>/>
Dim value As Nullable(Of TimeSpan) = CType(root.Attribute("Att"), Nullable(Of TimeSpan))
Console.WriteLine("Nullable TimeSpan: value={0}", IIf(value.HasValue, value.ToString(), "null"))

This example produces the following output:

Nullable TimeSpan: value=01:05:30

Universal Windows Platform
Available since 8
.NET Framework
Available since 3.5
Portable Class Library
Supported in: portable .NET platforms
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
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