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Even though the VolvoC30 class doesn t have the DetailLevel attribute, we still get results as though it had. Here is a simple test: using System; class CustomAttributeTest { static void Main(string[] args) { VolvoC30 myCar = new VolvoC30("Black"); Console.WriteLine("Car: {0}", myCar); // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } } The result of this test is as follows: Car: Manufacturer: Volvo, Model: C30, Color: Black Press enter to finish If we change the value of Inherited to false and run the test again, we get the following results: Car: VolvoC30 Press enter to finish As you can see, changing the specification of the custom attribute causes the derived class to revert to the base string representation, just as though the attribute had not been applied.

There are situations in which some safe subset of HTML should be allowed past filters and rendered to the user. An example would be a web-based e-mail application that allows harmless HTML tags (such as <h1>) in HTML e-mails to be rendered to the user, but does not allow the execution of malicious script contained in an e-mail. The general recommended approach to this problem is to parse the HTML with a strict parser, and completely remove all tags and attributes that are not on a whitelist of tags and attributes that are known to not allow arbitrary script execution.

To test your new info box details and obtain the result shown in Figure 9-5, you need a few more Regional News items published for the same region. Have a good time with browser views!

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In this chapter, we saw how the .NET attribute system allows you to apply modifiers to your custom types without having to add new keywords to C#. We started by looking at two of the built-in attributes, and I described how an attribute doesn t have value until some other part of the system gives it meaning. In the examples we looked at, the meaning was provided by a method in a base class and the C# compiler. We saw how to create and apply custom attributes and how to use reflection techniques to test to see whether attributes have been applied. This introduced topics that are covered fully in 23. The .NET Framework contains dozens of attributes, but they need to be described in context. We ll see some of the most useful when we come to 23, and others are used in LINQ, the Entity Framework, and other applied .NET technologies.

One of the most useful features of C# (and NET more generally) is automatic memory management When you create a new object, the memory required to store it is allocated automatically You don t need to do anything specific when you have finished working with the object The NET runtime takes care of releasing the memory that the object was using for you The part of the NET runtime that handles releasing memory is called the garbage collector (GC), and it generally works without you being aware that it is there and without you having to intervene in its operation There are times, however, when an understanding of garbage collection can be useful, and there are some explicit steps you can take to help the garbage collector work more effectively In this chapter, we look at how you modify your classes to work with the garbage collector.

Figure 9-5. We arranged a specialized Regional News view that shows contextual details. So, after having very quickly built a content type of our own, we also put a classification mechanism on it through a content region attribute, and a corresponding index in the catalog. Finally, we arranged a specialized Regional News view, able to show some interesting contextual details. In the next section, we will build a specialized search form with a region parameter stay tuned!

Getting this right is fairly difficult; we highly recommend that designers and developers of such applications consult a security expert versed in web application and cross-domain security issues.

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