PreviousNode Property

XNode.PreviousNode Property

 

Gets the previous sibling node of this node.

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

public XNode PreviousNode { get; }

Property Value

Type: System.Xml.Linq.XNode

The XNode that contains the previous sibling node.

If this XNode does not have a parent, or if there is no previous node, this property returns null.

The XContainer stores its child nodes as a singly-linked list of XNode objects. This means that the PreviousNode property must traverse the list of direct child nodes under the parent container. Therefore, using this property might affect your performance.

The following example uses this property to loop through nodes.


                XElement xmlTree = new XElement("Root",
    new XElement("Child1", 1),
    new XText("Some Text"),
    new XElement("Child2",
        2,
        new XElement("GrandChild", "GrandChild Content")
    ),
    new XComment("a comment"),
    new XElement("Child3")
);
XNode node = xmlTree.Element("Child2");
do {
    StringBuilder sb = new StringBuilder();
    sb.Append(String.Format("NodeType: {0}", node.NodeType.ToString().PadRight(10)));
    switch (node.NodeType)
    {
        case XmlNodeType.Text:
            sb.Append((node as XText).Value);
            break;
        case XmlNodeType.Element:
            sb.Append((node as XElement).Name);
            break;
        case XmlNodeType.Comment:
            sb.Append((node as XComment).Value);
            break;
    }
    Console.WriteLine(sb.ToString());
}
while ((node = node.PreviousNode) != null);

This example produces the following output:


                NodeType: Element   Child2
NodeType: Text      Some Text
NodeType: Element   Child1

Universal Windows Platform
Available since 4.5
.NET Framework
Available since 3.5
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
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