Článek
11/17/2011

XmlReader.ReadElementContentAsDouble Method

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

Reads the current element and returns the contents as a double-precision floating-point number.

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

Syntax

'Declaration
Public Overridable Function ReadElementContentAsDouble As Double

public virtual double ReadElementContentAsDouble()

Return Value

Type: System.Double
The element content as a double-precision floating-point number.

Exceptions

Exception	Condition
InvalidOperationException	The XmlReader is not positioned on an element.
XmlException	The current element contains child elements. -or- The element content cannot be converted to a double-precision floating-point number.
ArgumentNullException	The method is called with nulla null reference (Nothing in Visual Basic) arguments.

InvalidOperationException

The XmlReader is not positioned on an element.

XmlException

The current element contains child elements.

-or-

The element content cannot be converted to a double-precision floating-point number.

ArgumentNullException

The method is called with nulla null reference (Nothing in Visual Basic) arguments.

Remarks

This method reads the start tag, the contents of the element, and moves the reader past the end element tag. It expands entities and ignores processing instructions and comments. The element can only contain simple content. That is, it cannot have child elements.

Examples


Dim output As New StringBuilder()

Dim xmlString As String = _
            "<root>" & _
            "<stringValue><!--comment-->" & _
            "<?some pi?>text value of the element." & _
            "</stringValue>" & _
            "<longValue>270000000000001</longValue><number>0</number>" & _
            "<double>2E10</double><date>2003-01-08T15:00:00-00:00</date>" & _
            "</root>"

Using reader As XmlReader = XmlReader.Create(New StringReader(xmlString))

    reader.ReadToFollowing("double")
    Dim number As Double = reader.ReadElementContentAsDouble()
    ' Do some processing with the number object.    
    output.AppendLine(number.ToString())

    OutputTextBlock.Text = output.ToString()
End Using



StringBuilder output = new StringBuilder();

String xmlString =
    @"<root>
    <stringValue>
    <!--comment-->
    <?some pi?>
        text value of the element.
    </stringValue>
    <longValue>270000000000001</longValue>
    <number>0</number>
    <double>2E10</double>
    <date>2003-01-08T15:00:00-00:00</date>
</root>";

using (XmlReader reader = XmlReader.Create(new StringReader(xmlString)))
{
    reader.ReadToFollowing("double");
    Double number = reader.ReadElementContentAsDouble();
    // Do some processing with the number object.   

    output.AppendLine(number.ToString());
}

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.

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