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In 11, you learned how you can cache a web page by adding the OutputCache directive to the aspx page This type of caching, called output caching, caches a rendered HTML version of the page, which ASPNET can reuse automatically for future requests without executing any of your page code One of the drawbacks with response caching is that it works on an all-or-nothing basis It doesn t work if you need to render a portion of your page dynamically For example, you might want to cache a table that s filled with records read from a data source so that you can limit the round-trips to the database server, but you might still need to get a fresh output for the rest of the page If that s your situation, user controls can provide exactly what you re looking for because they can cache their own output.

The actual code for is fairly minimal, deferring most of its work to a utility function called , which parses the raw text, compiling it into a sequence of nodes. These nodes are just Python objects, each configured for a specific part of the template. Taken together, they represent the entire template, from start to finish, in a way that can be more easily and efficiently rendered. These nodes are attached to the template as an attribute called . When rendering the template with data, it simply iterates over this list, rendering each node individually. This keeps the code very minimal, while allowing maximum flexibility. After all, if each individual theme is responsible for rendering itself, it has the full power of Python at its disposal. Therefore, creating or customizing template nodes is a simple matter of writing some real Python code.

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This feature is called partial caching, or fragment caching, and it works in almost the same way as output caching The only difference is that you add the OutputCache directive to the user control, instead of the page To test this feature, add the following line to the ascx portion of a user control such as the TimeDisplay: <%@ OutputCache Duration="10" VaryByParam="None" %> Now in the hosting page you ll see that the displayed time won t change for ten seconds Refreshing the page has no effect The VaryByParam parameter has the same meaning as it did with web pages it allows to you to generate and cache fresh HTML output when the parameters in the query string portion of the URL change Alternatively, you can enable caching by adding the following attribute to the declaration of your user control class: [PartialCaching(10)] public class MyUserControl : UserControl { ...

} There s one caveat when using fragment caching When a user control is cached, the user control essentially becomes a block of static HTML As a result, the user control object won t be available to your web-page code Instead, ASPNET instantiates one of two more generic object types, depending on how the user control was created If the user control was created declaratively (by adding a user tag to the web page), a StaticPartialCachingControl object is added If the user control was created programmatically (using the LoadControl() method), a PartialCachingControl object is added ASPNET places the object into the logical position that a user control would occupy in the page s control hierarchy if it were not cached However, these objects are just placeholders they won t allow you to interact with the user control through its properties or methods.

If you aren t sure if caching is in effect, you should test for a null reference before you attempt to use the user control object..

All of this assumes that the template works correctly all the way through. When working with templates, there are a number of things that can go wrong, and thus a few different exceptions that could be raised. While the following exceptions are handled automatically in a way that works for most cases, it s possible to catch these instead and handle them separately. The template code doesn t validate as proper syntax, usually due to the use of an invalid tag name. This is raised immediately when trying to instantiate a object. The requested template couldn t be loaded by any of the known template loaders. This is issued by the template loading functions described in the Retrieving Templates section of this chapter.

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