XNode.IsBefore(XNode) Method
Definition
Important
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Determines if the current node appears before a specified node in terms of document order.
public:
bool IsBefore(System::Xml::Linq::XNode ^ node);
public bool IsBefore (System.Xml.Linq.XNode node);
public bool IsBefore (System.Xml.Linq.XNode? node);
member this.IsBefore : System.Xml.Linq.XNode -> bool
Public Function IsBefore (node As XNode) As Boolean
Parameters
Returns
true
if this node appears before the specified node; otherwise false
.
Examples
The following example uses this method.
XElement xmlTree = new XElement("Root",
new XText("Text content."),
new XElement("Child1", "child1 content"),
new XElement("Child2", "child2 content"),
new XElement("Child3", "child3 content"),
new XText("More text content."),
new XElement("Child4", "child4 content"),
new XElement("Child5", "child5 content")
);
XElement child3 = xmlTree.Element("Child3");
XElement child5 = xmlTree.Element("Child5");
if (child5.IsBefore(child3))
Console.WriteLine("Child5 is before Child3");
else
Console.WriteLine("Child5 is not before Child3");
Dim xmlTree As XElement = _
<Root>Text content.
<Child1>child1 content</Child1>
<Child2>child2 content</Child2>
<Child3>child3 content</Child3>More text content.
<Child4>child4 content</Child4>
<Child5>child5 content</Child5>
</Root>
Dim child3 As XElement = xmlTree.<Child3>(0)
Dim child5 As XElement = xmlTree.<Child5>(0)
If (child5.IsBefore(child3)) Then
Console.WriteLine("Child5 is before Child3")
Else
Console.WriteLine("Child5 is not before Child3")
End If
This example produces the following output:
Child5 is not before Child3
Remarks
The XContainer stores its child nodes as a singly-linked list of XNode objects. This means that the IsBefore 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
.NET
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