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To really change how the ASP.NET navigation model works, you need to create your own site map provider. You might choose to create a custom site map provider for several reasons: You need to store site map information in a different data source (such as a relational database). You need to store site map information with a different schema from the XML format expected by ASP.NET. This is most likely if you have an existing system in place for storing site maps. You need a highly dynamic site map that s generated on the fly. For example, you might want to generate a different site map based on the current user, the query string parameters, and so on. You need to change one of the limitations in the XmlSiteMapProvider implementation. For example, maybe you want the ability to have nodes with duplicate URLs. You have two choices when implementing a custom site map provider. All site map providers derive from the abstract base class SiteMapProvider in the System.Web namespace. You can derive from this class to implement a new provider from scratch. However, if you want to keep the same logic but use a different data store, just derive from the StaticSiteMapProvider class instead. It gives you a basic implementation of many methods, including the logic for node storing and searching. In the following sections, you ll see a custom provider that lets you store site map information in a database.

In this example, all navigation links are stored in a single database table. Because databases don t lend themselves easily to hierarchical data, you need to be a little crafty. In this example, each navigation link is linked to a parent link in the same table, except for the root node. This means that although the navigational links are flattened into one table, you can re-create the right structure by starting with the home page and then searching for the subset of rows at each level. Figure 16-14 shows the SiteMap table with some sample data that roughly duplicates the site map you saw earlier in this chapter.

Again, we ll use the ListActivity methods to manage the Cursor object and present the results in a list.

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Figure 16-14. The SiteMap table In this solution, the site map provider won t access the table directly. Instead, it will use a stored procedure. This gives some added flexibility and potentially allows you to store your navigation information with a different schema, as long as you return a table with the expected column names from your stored procedure.

Here s the stored procedure used in this example: CREATE PROCEDURE GetSiteMap AS SELECT * FROM SiteMap ORDER BY ParentID, Title GO

The POM XML file will contain the basic information for the project and you ll need to add the dependencies and plug-ins for your project manually.

String[] displayFields = new String[] {MediaStore.Audio.Media.DISPLAY_NAME}; int[] displayViews = new int[] {android.R.id.text1}; setListAdapter(new SimpleCursorAdapter(this, android.R.layout.simple_list_item_1, cursor, displayFields, displayViews));

Because this site map provider doesn t change the underlying logic of site map navigation, you can derive from StaticSiteMapProvider instead of deriving from SiteMapProvider and reimplementing all the tracking and navigation behavior (which is a much more tedious task). Here s the class declaration for the provider: public class SqlSiteMapProvider : StaticSiteMapProvider { ... } The first step is to override the Initialize() method to get all the information you need from the web.config file. The Initialize() method gives you access to the configuration element that defines the site map provider. In this example, your provider needs three pieces of information: The connection string for the database. The name of the stored procedure that returns the site map. The provider name for the database. This allows you to use provider-agnostic coding (as described in 7). In other words, you can support SQL Server, Oracle, or another database equally easily, as long as there s a .NET provider factory installed. You can configure your web application to use the custom provider (SqlSiteMapProvider) and supply the required three pieces of information using the <siteMap> section of the web.config file: <configuration> <system.web> <siteMap defaultProvider="SqlSiteMapProvider"> <providers> <add name="SqlSiteMapProvider" type="SqlSiteMapProvider" providerName="System.Data.SqlClient" connectionString= "Data Source=localhost;Initial Catalog=Northwind;Integrated Security=SSPI" storedProcedure="GetSiteMap" /> </providers> </siteMap> ... </system.web> </configuration> Now in your provider you simply need to retrieve these three pieces of information and store them for later: private string connectionString; private string providerName; private string storedProcedure; public override void Initialize(string name, System.Collections.Specialized.NameValueCollection attributes) { if (!IsInitialized) { base.Initialize(name, attributes);

// Retrieve the webconfig settings providerName = attributes["providerName"]; connectionString = attributes["connectionString"]; storedProcedure = attributes["storedProcedure"]; if (providerName == null || providerNameLength == 0) throw new Exception("The provider name was not found"); else if (connectionString == null || connectionStringLength == 0) throw new Exception("The connection string was not found"); else if (storedProcedure == null || storedProcedureLength == 0) throw new Exception("The stored procedure name was not found"); initialized = true; } } private bool initialized = false; public virtual bool IsInitialized { get { return initialized; } } The real work that the provider does is in the BuildSiteMap() method, which constructs the SiteMapNode objects that make up the navigation tree In the lifetime of an application, you ll typically construct the SiteMapNode once and reuse it multiple times.

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