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SiteMap.SiteMapResolve Event

Occurs when the CurrentNode property is accessed.

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

public static event SiteMapResolveEventHandler SiteMapResolve

Subscribers attach a SiteMapResolveEventHandler object to the static SiteMapResolve event to receive notification when the CurrentNode property is accessed. This enables the user to implement custom logic when creating a SiteMapNode representation of the currently executing page without requiring a custom provider implementation.

If you subscribe to the SiteMapResolve event, you also subscribe to the SiteMapResolve event on the default site map provider.

TopicLocation
How to: Programmatically Modify Site-Map Nodes in MemoryBuilding ASP .NET Web Applications
How to: Programmatically Modify Site-Map Nodes in MemoryBuilding ASP .NET Web Applications

The following code example demonstrates how to handle the SiteMapResolve event on an ASP.NET Web page to modify the target URLs that are displayed by a site navigation control, such as the SiteMapPath control. In this example, the current page is a post page in an online bulletin board or forum. In order to render more meaningful site navigation, the URLs of the nodes that are displayed by the navigation control are appended with context relevant query strings.

NoteNote:

The ASP.NET site navigation infrastructure guards against infinite recursion, which provides a safeguard and minimizes the security risk that is associated with accessing the CurrentNode property from within the. SiteMapResolveEventHandler class.

private void Page_Load(object sender, EventArgs e)
{
    // The ExpandForumPaths method is called to handle 
    // the SiteMapResolve event.
    SiteMap.SiteMapResolve +=
      new SiteMapResolveEventHandler(this.ExpandForumPaths);
}

private SiteMapNode ExpandForumPaths(Object sender, SiteMapResolveEventArgs e)
{
    // The current node represents a Post page in a bulletin board forum. 
    // Clone the current node and all of its relevant parents. This 
    // returns a site map node that a developer can then 
    // walk, modifying each node.Url property in turn. 
    // Since the cloned nodes are separate from the underlying 
    // site navigation structure, the fixups that are made do not 
    // effect the overall site navigation structure.
    SiteMapNode currentNode = SiteMap.CurrentNode.Clone(true);
    SiteMapNode tempNode = currentNode;

    // Obtain the recent IDs. 
    int forumGroupID = GetMostRecentForumGroupID();
    int forumID = GetMostRecentForumID(forumGroupID);
    int postID = GetMostRecentPostID(forumID);

    // The current node, and its parents, can be modified to include 
    // dynamic querystring information relevant to the currently 
    // executing request. 
    if (0 != postID)
    {
        tempNode.Url = tempNode.Url + "?PostID=" + postID.ToString();
    }

    if ((null != (tempNode = tempNode.ParentNode)) &&
        (0 != forumID))
    {
        tempNode.Url = tempNode.Url + "?ForumID=" + forumID.ToString();
    }

    if ((null != (tempNode = tempNode.ParentNode)) &&
        (0 != forumGroupID))
    {
        tempNode.Url = tempNode.Url + "?ForumGroupID=" + forumGroupID.ToString();
    }

    return currentNode;
}

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

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

.NET Framework

Supported in: 3.5, 3.0, 2.0

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