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} } Listing 17-2 applies the Obsolete attribute to the CalculateProduct method. There are two parameters to this attribute. The first is a message to explain why the method is obsolete, and the second controls whether using the method constitutes a compiler warning or a compiler error. A value of true means an error and any code that tries to access the obsolete method won t compile. The parameters you specify when applying an attribute are used as constructor parameters to create a new instance of the attribute type. We ll see more of this when we create a custom attribute later in the chapter. Using parameters with attributes allows you to flexibly apply the same attribute differently based on the circumstances. The parameters to the Obsolete attribute can be varied to give different error messages and to control the behavior of the C# compiler. Notice that, like the previous attribute, Obsolete has no meaning until it is interpreted by some other piece of code. In the case of the Flags attribute, the interpretation is found in the ToString method of the System.Enum class, which is the base for all enums. For the Obsolete attribute, the interpretation is found in the C# compiler. There are dozens of attributes included in the .NET Framework Library, but since each is interpreted and given meaning by another part of the .NET Framework, it is impossible and meaningless to catalog them out of their individual contexts. We will see some of the most commonly used attributes in other chapters in this book, including 23, where we cover the serialization of object.

Checking for an attribute is a lot more complex than applying an attribute and relies upon a technique known as reflection. I don t want to get into the details of reflection in this chapter, so I have included here the code that you need to check for an attribute that you can use verbatim in your projects with the detail explained later in this book. Attributes can be applied to any type or type member. In the following sections, I ll demonstrate testing for the Obsolete attribute applied to a class, a method, a field, and a property. The goal in each case is to end up with an object of the attribute type. Since I am using the Obsolete attribute, my goal is to obtain an instance of the System.ObsoleteAttribute class.

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The simplest test is for an attribute that has been applied to a class (or other type). Here is an example: using System; [Obsolete("Don't use this class")] class Calculator { public int CalculateProduct(int x, int y) { return x + y; } }

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The Obsolete attribute has been applied to the entire Calculator class. Listing 17-3 shows a class that you can use to test whether an attribute has been applied to a class. Listing 17-3. Testing for an Attribute Applied to a Class using System; class AttributeTester<T> where T : Attribute { public bool TestForClassAttribute(Type classType) { return Attribute.IsDefined(classType, typeof(T)); } public T GetClassAttribute(Type classType) { return Attribute.GetCustomAttribute(classType, typeof(T)) as T; } public bool TestForClassAttribute(object obj) { return TestForClassAttribute(obj.GetType()); } public T GetClassAttribute(object obj) { return GetClassAttribute(obj.GetType()); } } To check whether a class has had an attribute applied, create a new instance of the AttributeTester<T> class where T is the attribute you are interested in. Here s an example: // create an Attribute Tester for the attribute we are interested in AttributeTester<ObsoleteAttribute> attrTester = new AttributeTester<ObsoleteAttribute>(); Once you have created an AttributeTester<T> object, you can use it to check for and retrieve attributes. If you just want to check to see whether an attribute has been applied, you can use the TestForClassAttribute method. There are overloaded versions of this method that let you test using an object or a System.Type. Here is an example of testing for the Obsolete attribute using an object: using System; class ObjectTest { static void Main(string[] args) { // create an Attribute Tester for the attribute we are interested in AttributeTester<ObsoleteAttribute> attrTester = new AttributeTester<ObsoleteAttribute>(); // create an instance of the Calculator class Calculator calc = new Calculator(); // check to see whether the attribute has been defined using the class name

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