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SiteMapProvider.GetParentNode Method

Note: This method is new in the .NET Framework version 2.0.

When overridden in a derived class, retrieves the parent node of a specific SiteMapNode object.

Namespace: System.Web
Assembly: System.Web (in system.web.dll)

public abstract SiteMapNode GetParentNode (
	SiteMapNode node
)
public abstract SiteMapNode GetParentNode (
	SiteMapNode node
)
public abstract function GetParentNode (
	node : SiteMapNode
) : SiteMapNode

Parameters

node

The SiteMapNode for which to retrieve the parent node.

Return Value

A SiteMapNode that represents the parent of node; otherwise, a null reference (Nothing in Visual Basic), if the SiteMapNode has no parent or security trimming is enabled and the parent node is not accessible to the current user.

The following code example demonstrates how to implement the GetParentNode method in a class that implements the abstract SiteMapProvider class. The SimpleTextSiteMapProvider stores the hierarchical parent/child relationship between SiteMapNode objects in an IList interface, such as an ArrayList object.

This code example is part of a larger example provided for the SiteMapProvider class.

// Implement the GetChildNodes method.
public override SiteMapNodeCollection GetChildNodes(SiteMapNode node)
{
  SiteMapNodeCollection children = new SiteMapNodeCollection();
  // Iterate through the ArrayList and find all nodes that have the specified node as a parent.
  lock (this)
  {
    for (int i = 0; i < childParentRelationship.Count; i++)
    {

      string nodeUrl = ((DictionaryEntry)childParentRelationship[i]).Key as string;

      SiteMapNode parent = GetNode(childParentRelationship, nodeUrl);

      if (parent != null && node.Url == parent.Url)
      {
        // The SiteMapNode with the Url that corresponds to nodeUrl
        // is a child of the specified node. Get the SiteMapNode for
        // the nodeUrl.
        SiteMapNode child = FindSiteMapNode(nodeUrl);
        if (child != null)
        {
          children.Add(child as SiteMapNode);
        }
        else
        {
          throw new Exception("ArrayLists not in sync.");
        }
      }
    }
  }
  return children;
}
protected override SiteMapNode GetRootNodeCore()
{
  return RootNode;
}
// Implement the GetParentNode method.
public override SiteMapNode GetParentNode(SiteMapNode node)
{
  // Check the childParentRelationship table and find the parent of the current node.
  // If there is no parent, the current node is the RootNode.
  SiteMapNode parent = null;
  lock (this)
  {
    // Get the Value of the node in childParentRelationship
    parent = GetNode(childParentRelationship, node.Url);
  }
  return parent;
}

Windows 98, Windows 2000 SP4, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0

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