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As you know, once a type (class, interface, structure, enum, or delegate) is defined and compiled into a NET assembly, its definition is, more or less, final The only way to add new members, update members, or remove members is to recode and recompile the code base into an updated assembly (or take more drastic measures, such as using the SystemReflectionEmit namespace to dynamically reshape a compiled type) Under C# 30, it is now possible to define methods as extension methods In a nutshell, extension methods allow existing compiled types (such as classes within an external NET class library) as well as types currently being compiled (such as types in a project that contains extension methods) to gain new functionality without needing to directly update the type being extended.

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As suggested, this technique can be quite helpful when you need to inject new functionality into types for which you do not have an existing code base It can also be quite helpful when you need to force a type to support a set of members (in the interest of polymorphism), but cannot modify the original type declaration Using extension methods, you can add functionality to precompiled types while providing the illusion these methods were there all along When you define extension methods, the first restriction is that they must be defined within a static class (see 3), and therefore each extension method must also be declared as static The second point is that all extension methods are marked as such by using the this keyword as a modifier on the first (and only the first) parameter of the method in question.

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Note This layout can be seen in action at www.danielrubin.org/procss/nohacks/.

Figure 7-5. Unexpected result in Immediate window Let s check our variables and make sure they re holding correct values by inserting a few message boxes. You can create message boxes by calling the MsgBox function. As shown in Figure 7-6, the MsgBox function takes a few arguments, but since we re not presenting these to a user at this time, we ll just pass in the first argument, the prompt or message.

The third point is that every extension method can be called either from the correct instance in memory or statically via the defining static class Sound strange Let s look at a full example to clarify matters..

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Assume you are authoring a utility class named MyExtensions that defines two extension methods. The first method allows any object in the .NET base class libraries to have a brand-new method named DisplayDefiningAssembly() that makes use of types in the System.Reflection namespace. The second extension method, named ReverseDigits(), allows any System.Int32 to obtain a new version of itself where the value is reversed digit by digit. For example, if an integer with the value 1234 called ReverseDigits(), the integer returned is set to the value 4321: static class MyExtensions { // This method allows any object to display the assembly // it is defined in. public static void DisplayDefiningAssembly(this object obj) { Console.WriteLine("{0} lives here:\n\t->{1}\n", obj.GetType().Name, Assembly.GetAssembly(obj.GetType())); } // This method allows any integer to reverse its digits. // For example, 56 would return 65. public static int ReverseDigits(this int i) { // Translate int into a string, and then // get all the characters. char[] digits = i.ToString().ToCharArray();

// Now reverse items in the array. Array.Reverse(digits); // Put back into string. string newDigits = new string(digits); // Finally, return the modified string back as an int. return int.Parse(newDigits); } } Again note how the first parameter of each extension method has been qualified with the this keyword, before defining the parameter type. Given that DisplayDefiningAssembly() has been prototyped to extend System.Object, any type in any assembly now has this new member. However, ReverseDigits() has been prototyped to only extend integer types, and therefore if anything other than an integer attempts to invoke this method, you will receive a compile-time error. Understand that a given extension method could have multiple parameters, but only the first parameter can be qualified with this. To illustrate, here is an overloaded extension method defined in another utility class, named simply TesterUtilClass: static class TesterUtilClass { // Every Int32 now has a Foo() method... public static void Foo(this int i) { Console.WriteLine("{0} called the Foo() method.", i); } // ...which has been overloaded to take a string! public static void Foo(this int i, string msg) { Console.WriteLine("{0} called Foo() and told me: {1}", i, msg); } }

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