XElement Narrowing Conversion (XElement to Nullable(Of TimeSpan))
[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]
Cast the value of this XElement to a Nullable(Of T) of TimeSpan.
Assembly: System.Xml.Linq (in System.Xml.Linq.dll)
'Declaration Public Shared Narrowing Operator CType ( _ element As XElement _ ) As Nullable(Of TimeSpan)
Parameters
- element
- Type: System.Xml.Linq.XElement
The XElement to cast to Nullable(Of T) of TimeSpan.
Return Value
Type: System.Nullable(Of TimeSpan)A Nullable(Of T) of TimeSpan that contains the content of this XElement.
| Exception | Condition |
|---|---|
| FormatException | The element 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. For more information, see the NOTE-datetime W3C specification.
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 element with time span content. It then retrieves the value by casting to Nullable(Of T) of TimeSpan.