/Visual Studio 2010/CSASPNETBreadcrumbWithQueryString/DynamicBreadcrumb.aspx.cs

/****************************** Module Header ******************************\

* Module Name:    DynamicBreadcrumb.aspx.cs

* Project:        CSASPNETBreadcrumbWithQueryString

* Copyright (c) Microsoft Corporation

*

* This page shows that even a page is not in the site map, we still can 

* create the breadcrumb dynamically. 

* 

* This source is subject to the Microsoft Public License.

* See http://www.microsoft.com/opensource/licenses.mspx#Ms-PL.

* All other rights reserved.

*

\*****************************************************************************/



using System;

using System.Web;



namespace CSASPNETBreadcrumbWithQueryString

{

    public partial class DynamicBreadcrumb : System.Web.UI.Page

    {

        protected void Page_Load(object sender, EventArgs e)

        {

            if (!IsPostBack)

            {

                // Handle SiteMapResolve event to dynamically change current SiteMapNode.

                SiteMap.SiteMapResolve += new SiteMapResolveEventHandler(SiteMap_SiteMapResolve);

            }

        }



        /// <summary>

        /// Occurs when the CurrentNode property is accessed.

        /// </summary>

        /// <param name="sender">

        /// The source of the event, an instance of the SiteMapProvider class.

        /// </param>

        /// <param name="e">

        /// A SiteMapResolveEventArgs that contains the event data.

        /// </param>

        /// <returns>

        /// The SiteMapNode that represents the result of the SiteMapResolveEventHandler operation.

        /// </returns>

        SiteMapNode SiteMap_SiteMapResolve(object sender, SiteMapResolveEventArgs e)

        {

            // Only need one execution in one request.

            SiteMap.SiteMapResolve -= new SiteMapResolveEventHandler(SiteMap_SiteMapResolve);



            // We can dynamically create many SiteMapNodes here.

            SiteMapNode childNode = new SiteMapNode(SiteMap.Provider, "2");

            childNode.Url = "/child.aspx";

            childNode.Title = "child";



            childNode.ParentNode = new SiteMapNode(SiteMap.Provider, "1");

            childNode.ParentNode.Url = "/root.aspx";

            childNode.ParentNode.Title = "root";



            // Also we can associate the dynamic nodes with the existent site map.

            SiteMapNode nodeFromSiteMap = GetSiteMapNode("item");

            if (nodeFromSiteMap != null)

            {

                childNode.ParentNode.ParentNode = nodeFromSiteMap;

            }



            // Use the new SiteMapNode in the breadcrumb.

            return childNode;

        }



        /// <summary>

        /// Get a siteMapNode from the site map.

        /// </summary>

        /// <param name="key">

        /// The resourceKey of the siteMapNode.

        /// </param>

        /// <returns></returns>

        SiteMapNode GetSiteMapNode(string key)

        {

            return GetSiteMapNode(SiteMap.RootNode, key);

        }

        SiteMapNode GetSiteMapNode(SiteMapNode rootNode, string key)

        {

            if (rootNode.ResourceKey == key)

            {

                return rootNode;

            }

            else if (rootNode.HasChildNodes)

            {

                foreach (SiteMapNode childNode in rootNode.ChildNodes)

                {

                    SiteMapNode resultNode = GetSiteMapNode(childNode, key);

                    if (resultNode != null)

                    {

                        return resultNode;

                    }

                }

            }

            return null;

        }

    }

}