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One issue you might notice with the SqlSiteMapProvider is that it stores the root node for the current site map in memory indefinitely. This means the SqlSiteMapProvider uses the same site map until the application domain is restarted (for example, when you rebuild your website or change its configuration settings). If you plan to change your site map regularly, you have several choices to make sure your application notices the change and refreshes the site map. The best option is to use the data cache to keep the root note around for a limited amount of time. You can use time-based expiry (for example, so the site map is refreshed once an hour). Here s a revised version of the BuildSiteMap() method that uses caching and keeps the site map in the cache for a number of seconds that s specified by an attribute in the custom provider tag in the web.config file: public override SiteMapNode BuildSiteMap() { SiteMapNode rootNode; lock (this) { rootNode = HttpContext.Current.Cache["rootNode"] as SiteMapNode; if (rootNode == null) { ... // Store the root node in the cache. HttpContext.Current.Cache.Insert("rootNode", rootNode, null, DateTime.Now.AddSeconds(cacheTime), TimeSpan.Zero); } } return rootNode; } If you want to get even more sophisticated, you can use SQL Server cache invalidation to automatically remove your cached site map when a change takes place in the SiteMap table. The only disadvantage is that this is a SQL Server specific feature, so it breaks the broad database compatibility enjoyed by the SqlSiteMapProvider (which currently supports any data source that has an ADO.NET data provider and data factory).

The infrastructure presented in the first part of this chapter provides the fundamentals for localizing any type of .NET-based application, including Windows applications, class libraries, services, and (of course) web applications. Before you learn about the technical details for localizing applications, we will discuss the major challenges in doing do. Figure 17-5 shows some challenges of localizing a web application.

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Styles are listed in this table in order of most general to most specific. That means the SelectedNodeStyle style settings override any conflicting settings in a RootNodeStyle, for example. (If you don t want a node to be selectable, set the TreeNode.SelectAction to None.) However, the RootNodeStyle, ParentNodeStyle, and LeafNodeStyle settings never conflict, because the definitions for root, parent, and leaf nodes are mutually exclusive. You can t have a node that is simultaneously a parent and a root node, for example the TreeView simply designates this as a root node.

If you decide to implement database cache invalidation, you need to take care to ensure that it s an optional feature. For example, you might decide to use the time-based caching approach shown here unless you find a specific attribute in the custom provider tag that indicates database cache invalidation is supported. You d also need to distinguish between database cache invalidation for SQL Server 2005 and database cache invalidation for SQL Server 2000. For more information, refer to 11.

Although this is a simple example, it demonstrates some of the core challenges for localizing web applications. The simplest challenge, of course, is localizing the strings for the captions of the labels as well as the buttons. Also, you must localize the format for the currency values and for the dates and times. For that purpose, you need to localize the validation expression of the validation control. Finally, when parsing the information in the code for storing it in a database or for other processing steps, you need to consider the format for dates, times, and currency values. All these values might be different and therefore customized from culture to culture.

Being able to apply styles to different types of nodes is interesting, but a more useful feature is being able to apply styles based on the node level. That s because most trees use a rigid hierarchy (for example, the first level of nodes represents categories, the second level represents products, the third represents orders, and so on). In this case, it s not so important to determine whether a node has children. Instead, it s important to determine the node s depth. The only problem is that a TreeView can have a theoretically unlimited number of node levels. Thus, it doesn t make sense to expose properties such as FirstLevelStyle, SecondLevelStyle, and so on. Instead, the TreeView has a LevelStyles collection that can have as many entries as you want. The level is inferred from the position of the style in the collection, so the first entry is considered the root level, the second entry is the second node level, and so on. For this system to work, you must follow the same order, and you must include an empty style placeholder if you want to skip a level without changing the formatting. For example, here s a TreeView that doesn t use any indenting but instead differentiates levels by applying different amounts of spacing and different fonts: <asp:TreeView runat="server" HoverNodeStyle-Font-Underline="true" ShowExpandCollapse="false" NodeIndent="0"> <LevelStyles> <asp:TreeNodeStyle ChildNodesPadding="10" Font-Bold Font-Size="12pt" ForeColor="DarkGreen"/> <asp:TreeNodeStyle ChildNodesPadding="5" Font-Bold Font-Size="10pt" /> <asp:TreeNodeStyle ChildNodesPadding="5" Font-UnderLine Font-Size="10pt" /> </LevelStyles> ... </asp:TreeView> If you apply this to the category and product list shown in earlier examples, you ll see a page like the one shown in Figure 16-17.

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