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By making a small change in the declaration of method Average, you can use the instance invocation form. The change you need to make is to add the keyword this before the type name in the parameter declaration as shown following. Adding the this keyword to the first parameter of the static method of the static class changes it from a regular method of class ExtendMyData into an extension method of class MyData. You can now use both invocation forms. Must be a static class static class ExtendMyData { Must be public and static Keyword and type public static double Average( this MyData md ) { ... ) } The important requirements for an extension method are the following: The extension method must be declared static. The class in which the extension method is declared must also be declared static. The extension method must contain as its first parameter type the keyword this, followed by the name of the class it is extending. Figure 7-21 illustrates the structure of an extension method.

The next chapter gets into some of the more visual new features of Mustang those of the java.awt and javax.swing packages. You saw how to access the system desktop in 1. 4 teaches you about the new splash screen support, table sorting and filtering, and system tray access.

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As a cross-check to this entire overview, it s interesting to understand some of what the compiler does under the hood . It simply translates an object declaration into the corresponding data declarations and links to the lineage s functions (programs), because actually copying the functions would be extremely inefficient. Therefore, multiple same-class logical objects are physical structures (memory-based records), each with a link to the single set of functions; each object creation is an added structure. Each structure is a namespace, and the links can be static or dynamic, depending on the function definition. While this understanding removes some of the luster of objects, it makes them clearer, and it does reinforce that this isn t object software but object-oriented software.

The following code shows a full program, including class MyData and extension method Average declared in class ExtendMyData. Notice that method Average is invoked exactly as if it were an instance member of MyData! Figure 7-21 illustrates the code. Classes MyData and ExtendMyData together act like the desired class, with three methods. namespace ExtensionMethods { sealed class MyData { private double D1, D2, D3; public MyData(double d1, double d2, double d3) { D1 = d1; D2 = d2; D3 = d3; } public double Sum() { return D1 + D2 + D3; } } static class ExtendMyData Keyword and type { public static double Average(this MyData md) { Declared static return md.Sum() / 3; } } class Program { static void Main() { MyData md = new MyData(3, 4, 5); Console.WriteLine("Sum: {0}", md.Sum()); Console.WriteLine("Average: {0}", md.Average()); } } Invoke as an instance member of the class } This code produces the following output: Sum: 12 Average: 4

ave GUIs gotten better Graphical user interfaces written with the Swing component set seem to be on the rise since JDK 1.4. I m not sure what triggered the change, but it is no longer abnormal to see a full-fledged graphical program written from the ground up with the Java programming language. Just look at Sun s Swing Connection at www. theswingconnection.com to see the latest things people are doing with Java-based user interfaces. Of the packages covered in this book so far, the AWT and Swing packages have changed the most. Table 4-1 shows the java.awt updates, and Table 4-2 shows javax.swing s changes.

An external method is a method that does not have an implementation in the declaration. Often the implementation is in a language other than C#. External methods are marked with the extern modifier and do not have an implementation in the class declaration. The implementation is replaced by a semicolon. Keyword public static extern int GetCurrentDirectory(int size, StringBuilder buf); No implementation Connecting the declaration with the implementation is implementation-dependent, but is often done using the DllImport attribute. Attributes are covered in detail in 24. For example, the following code uses an external method, GetCurrentDirectory, whose implementation is the Win32 system call for getting a string that contains the current directory. using System; using System.Text; using System.Runtime.InteropServices; namespace ExternalMethod { class MyClass { [DllImport("kernel32", SetLastError=true)] public static extern int GetCurrentDirectory(int a, StringBuilder b); } class Program { static void Main( ) { const int MaxDirLength = 250; StringBuilder sb = new StringBuilder(); sb.Length = MaxDirLength; MyClass.GetCurrentDirectory(MaxDirLength, sb); Console.WriteLine(sb); } } }

This code produces the following output:

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