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XNode.CompareDocumentOrder Method

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

Compares two nodes to determine their relative XML document order.

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

Syntax

'Declaration
Public Shared Function CompareDocumentOrder ( _
    n1 As XNode, _
    n2 As XNode _
) As Integer

public static int CompareDocumentOrder(
    XNode n1,
    XNode n2
)

Parameters

Return Value

Type: System.Int32
An int containing 0 if the nodes are equal; -1 if n1 is before n2; 1 if n1 is after n2.

Exceptions

Exception Condition
InvalidOperationException

The two nodes do not share a common ancestor.

Examples

The following example uses this method.

Dim output As New StringBuilder
Dim xmlTree As XElement = _
        <Root>
            <Child1>
                <GrandChild1>1</GrandChild1>
                <GrandChild2>2</GrandChild2>
                <GrandChild3>3</GrandChild3>
            </Child1>
            <Child2>
                <GrandChild4>4</GrandChild4>
                <GrandChild5>5</GrandChild5>
                <GrandChild6>6</GrandChild6>
            </Child2>
        </Root>

Dim el1 As XElement = xmlTree...<GrandChild2>(0)
Dim el2 As XElement = xmlTree...<GrandChild6>(0)

If (XElement.CompareDocumentOrder(el1, el2) = 0) Then
    output.Append("Compared elements are the same element")
    output.Append(Environment.NewLine)
ElseIf (XElement.CompareDocumentOrder(el1, el2) > 0) Then
    output.Append("el1 is after el2")
    output.Append(Environment.NewLine)
Else
    output.Append("el1 is before el2")
    output.Append(Environment.NewLine)
End If

OutputTextBlock.Text = output.ToString()

StringBuilder output = new StringBuilder();
XElement xmlTree = new XElement("Root",
    new XElement("Child1",
        new XElement("GrandChild1", 1),
        new XElement("GrandChild2", 2),
        new XElement("GrandChild3", 3)
    ),
    new XElement("Child2",
        new XElement("GrandChild4", 4),
        new XElement("GrandChild5", 5),
        new XElement("GrandChild6", 6)
    )
);
XElement el1 = xmlTree.Descendants("GrandChild2").First();
XElement el2 = xmlTree.Descendants("GrandChild6").First();
if (XElement.CompareDocumentOrder(el1, el2) == 0)
    output.Append("Compared elements are the same element" + Environment.NewLine);
else if (XElement.CompareDocumentOrder(el1, el2) > 0)
    output.Append("el1 is after el2" + Environment.NewLine);
else
    output.Append("el1 is before el2" + 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.