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XNode.CompareDocumentOrder(XNode, XNode) Method

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Definition

Namespace:
System.Xml.Linq
Assembly:
System.Xml.XDocument.dll
Assembly:
System.Xml.Linq.dll
Assembly:
netstandard.dll
Source:
XNode.cs
Source:
XNode.cs
Source:
XNode.cs

Compares two nodes to determine their relative XML document order.

public:
 static int CompareDocumentOrder(System::Xml::Linq::XNode ^ n1, System::Xml::Linq::XNode ^ n2);
public static int CompareDocumentOrder (System.Xml.Linq.XNode n1, System.Xml.Linq.XNode n2);
public static int CompareDocumentOrder (System.Xml.Linq.XNode? n1, System.Xml.Linq.XNode? n2);
static member CompareDocumentOrder : System.Xml.Linq.XNode * System.Xml.Linq.XNode -> int
Public Shared Function CompareDocumentOrder (n1 As XNode, n2 As XNode) As Integer

Parameters

n1
XNode

First XNode to compare.

n2
XNode

Second XNode to compare.

Returns

Int32

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

Exceptions

InvalidOperationException

The two nodes do not share a common ancestor.

Examples

The following example uses this method.

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)  
    Console.WriteLine("Compared elements are the same element");  
else if (XElement.CompareDocumentOrder(el1, el2) > 0)  
    Console.WriteLine("el1 is after el2");  
else  
    Console.WriteLine("el1 is before el2");  

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  
    Console.WriteLine("Compared elements are the same element")  
ElseIf (XElement.CompareDocumentOrder(el1, el2) > 0) Then  
    Console.WriteLine("el1 is after el2")  
Else  
    Console.WriteLine("el1 is before el2")  
End If

This example produces the following output:

el1 is before el2

Remarks

The XContainer stores its child nodes as a singly-linked list of XNode objects. This means that the CompareDocumentOrder method must traverse the ancestors of the two nodes being compared until it finds the common parent. Then it must traverse the list of the common parent's child nodes to determine the order of the two nodes being compared. Therefore, using this method might affect your performance.

Applies to

See also