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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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Here s the XAML used for scaling the rectangle up and down in the second row of Figure 9-10. <Rectangle Stroke="Crimson" Fill="Crimson" Width="50" Height="50"> <Rectangle.RenderTransform> <ScaleTransform ScaleX="1.5" ScaleY="1.5"/> </Rectangle.RenderTransform> </Rectangle>

You cannot use keywords as identifiers; keywords are reserved words that have special meaning in C# and are discussed later in this section. For example, the word class is a keyword, meaning that you cannot use the word class as an identifier. You can combine keywords with other words, however for example, MyClass is allowed.

Tip You can prefix a keyword with the @ symbol to make an identifier for example, @class. I recommend that you do not use this feature, because it tends to cause confusion, and there are an almost infinite number of less troublesome identifiers available for use.

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Keywords are words that have special meaning in C#; you use them to tell the C# compiler about your program or to perform a specific task or function. A reference list of C# keywords is at the end of this chapter, along with examples of their use. Figure 4-2 illustrates the keywords in Listing 4-1.

Figure 4-2. The keywords in Listing 4-1

Literals are data items that you enter into your code by value. These are interpreted by the compiler and converted into a C# data type. Types are explained later in this chapter. Literals are a convenient way to express simple values, such as numbers, strings of characters, and Boolean values (true and false). Figure 4-3 shows the two numeric literals in Listing 4-1, both of which express the same value the number 10. The third literal is a string literal. You can read about numeric and Boolean literals in 5 and about string and character literals in 16.

Figure 4-3. The literals in Listing 4-1

The final transformation class that Silverlight provides is the matrix transformation. This can be used when the other transformations don t give you what you want, or when you want to combine multiple transformations into a single transformation (although you could also use TransformGroup to group several). Each of the other transformations can be represented by a 3~TMS3 matrix. Let s dust off our linear algebra textbooks and revisit the basics of matrix math to see how a matrix can give us the other transformations, and even combine multiple transformations into a single operation. The 3~TMS3 matrix that Silverlight uses looks like Figure 9-11.

Operators describe calculations or actions that are performed on one or more operands. If you have programmed in almost any other language, the C# operators will be familiar to you. There are three operators in Listing 4-1, as illustrated in Figure 4-4.

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