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XElement Narrowing Conversion (XElement to Nullable(Of Double))

Cast the value of this XElement to a Nullable(Of T) of Double.

This API is not CLS-compliant. 

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

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

Parameters

element
Type: System.Xml.Linq.XElement

The XElement to cast to Nullable(Of T) of Double.

Return Value

Type: System.Nullable(Of Double)
A Nullable(Of T) of Double that contains the content of this XElement.

ExceptionCondition
FormatException

The element does not contain a valid Double value.

The following example creates an element with double precision floating point content. It then retrieves the value by casting to Nullable(Of T) of Double.

Dim root As XElement = _
        <Root>
            <Value>1.79769313486231e308</Value>
        </Root>

Dim value As Nullable(Of Double) = CType(root.Element("Value"), Nullable(Of Double))
Console.WriteLine("Nullable double: value={0}", IIf(value.HasValue, value.ToString(), "null"))

This example produces the following output:

Nullable double: value=1.79769313486231E+308

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0

Portable Class Library

Supported in: Portable Class Library

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8
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