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As time passes, the data source may change in response to other actions. However, if your code uses caching, you may remain unaware of the changes and continue using out-of-date information from the cache. To help mitigate this problem, ASP.NET supports cache dependencies. Cache dependencies allow you to make a cached item dependent on another resource so that when that resource changes the cached item is removed automatically. ASP .NET includes three types of dependencies: Dependencies on other cache items Dependencies on files or folders Dependencies on a database query In the following section, you ll consider the first two options. Toward the end of this chapter, you ll learn about SQL dependencies, and you ll learn how to create your own custom dependencies two tasks that are new in ASP.NET 2.0.

Lists containing the AND and OR conditional operators are evaluated from left to right. A command following the AND operator (&&) is executed if the previous command is successful. The part following the OR operator (||) is executed if the previous command fails.

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To create a cache dependency, you need to create a CacheDependency object and then use it when adding the dependent cached item. For example, the following code creates a cached item that will automatically be evicted from the cache when an XML file is changed, deleted, or overwritten. // Create a dependency for the ProductList.xml file. CacheDependency prodDependency = new CacheDependency( Server.MapPath("ProductList.xml")); // Add a cache item that will be dependent on this file. Cache.Insert("ProductInfo", prodInfo, prodDependency); If you point the CacheDependency to a folder, it watches for the addition, removal, or modification of any files in that folder. Modifying a subfolder (for example, renaming, creating, or removing a subfolder) also violates the cache dependency. However, changes further down the directory tree (such as adding a file into a subfolder or creating a subfolder in a subfolder) don t have any effect. The CacheDependency provides several constructors. You ve already seen how it can make a dependency based on a file by using the filename constructor. You can also specify a directory that needs to be monitored for changes, or you can use a constructor that accepts an array of strings that represent multiple files or directories. Yet another constructor accepts an array of filenames and an array of cache keys. The following example uses this constructor to create an item that is dependent on another item in the cache: Cache["Key1"] = "Cache Item 1"; // Make Cache["Key2"] dependent on Cache["Key1"]. string[] dependencyKey = new string[1]; dependencyKey[0] = "Key1"; CacheDependency dependency = new CacheDependency(null, dependencyKey); Cache.Insert("Key2", "Cache Item 2", dependency); Next, when Cache["Key 1"] changes or is removed from the cache, Cache["Key 2"] will automatically be dropped.

If you ve programmed only with classic ASP before, you might wonder why Microsoft changed everything with ASP .NET. Learning a whole new framework isn t trivial, and .NET introduces a slew of concepts and can pose some serious stumbling blocks. Overall, classic ASP is a solid tool for developing web applications using Microsoft technologies. However, as with most development models, ASP solves some problems but also raises a few of its own. The following sections outline these problems.

If you ve created applications with ASP you ve probably seen lengthy pages that contain server-side , script code intermingled with HTML. Consider the following example, which fills an HTML dropdown list with the results of a database query: <% Set dbConn = Server.CreateObject("ADODB.Connection") Set rs = Server.CreateObject("ADODB.Recordset") dbConn.Open connectionString %> <select name="cboAuthors"> <%

Most boilerplate in views is either at the very beginning or the very end Usually it handles such tasks as initializing various objects, testing standard prerequisites, handling errors gracefully or customizing the response before it goes out to the browser The real meat of the view is what sits in the middle, and that s the part that s fun to write Described in 2, decorators are a great way to wrap several functions in some common code that can be written once and tested easily, which reduces both bugs and programmer fatigue Since views are typically just standard Python functions, decorators can be used here as well 2 illustrated how decorators can be used to write a wrapper around the original function, which can then access all the arguments that were intended for that function, as well as the return value from the function itself.

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