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This is one of only two required methods, and is called repeatedly throughout the processing of the file, each time receiving a portion of the file s contents as , with being the offset within the file where that content was found The amount of data called each time is based on the handler s attribute, which defaults to 64KB Once this method has completed processing the data chunk, it can also control how other handlers deal with that data This is determined by whether the method returns any data or not, with any data returned being passed along to the next handler in line If it returns , Django will simply repeat the process with the next chunk of data As a complement to , this method is called when Django finds the end of the file in the request.

dynamic content, and by doing so you guarantee that your method is always called, and its content is never cached. The method that generates the dynamic content needs to be static. That s because ASP.NET needs to be able to call this method even when there isn t an instance of your page class available. (Obviously, when your page is served from the cache, the page object isn t created.) The signature for the method is fairly straightforward it accepts an HttpContext object that represents the current request, and it returns a string with the new HTML. Here s an example that returns a date with bold formatting: private static string GetDate(HttpContext context) { return "<b>" + DateTime.Now.ToString() + "</b>"; } To get this in the page, you need to use the Response.WriteSubstitution() method at some point: protected void Page_Load(object sender, EventArgs e) { Response.Write("This date is cached with the page: "); Response.Write(DateTime.Now.ToString() + "<br />"); Response.Write("This date is not: "); Response.WriteSubstitution(new HttpResponseSubstitutionCallback(GetDate)); } Now, even if you apply caching to this page with the OutputCache directive, the date will still be updated for each request. That s because the callback bypasses the caching process. Figure 11-2 shows the result of running the page and refreshing it several times.

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Figure 11-2. Injecting dynamic content into a cached page The problem with this technique is that post-cache substitution works at a lower level than the rest of your user interface. Usually, when you design an ASP.NET page, you don t use the Response object at all instead, you use web controls, and those web controls use the Response object to generate their content. One problem is that if you use the Response object as shown in the previous example, you ll lose the ability to position your content with respect to the rest of the page. The only realistic solution is to wrap your dynamic content in some sort of control. That way, the control can use Response.WriteSubstitution() when it renders itself. You ll learn more about control rendering in 27.

However, if you don t want to go to the work of developing a custom control just to get the postcache substitution feature, ASP.NET has one shortcut a generic Substitution control that uses this technique to make all its content dynamic. You bind the Substitution control to a static method that returns your dynamic content, exactly as in the previous example. However, you can place the Substitution control alongside other ASP.NET controls, allowing you to control exactly where the dynamic content appears. Here s an example that duplicates the earlier example using markup in the .aspx portion of the page: This date is cached with the page: <asp:Label ID="lblDate" runat="server" /><br /> This date is not: <asp:Substitution ID="Substitution1" runat="server" MethodName="GetDate" /> Unfortunately, at design time you won t see the content for the Substitution control. Remember, post-cache substitution allows you to execute only a static method. ASP.NET still skips the page life cycle, which means it won t create any control objects or raise any control events. If your dynamic content depends on the values of other controls, you ll need to use a different technique (such as data caching), because these control objects won t be available to your callback.

Custom controls are free to use Response.WriteSubstitution() to set their caching behavior. For example, the AdRotator uses this feature to ensure that the advertisement on a page is always rotated, even when the rest of the page is served from the output cache.

Since this is also the only time the file s total size can be known with certainty, Django gives each handler a chance to determine what to do with that information..

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