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8849CH13.qxd  10/2/07  12:42 PM  Page 425

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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); }

}

Invoking Extension Methods on an Instance Level

Now that we have these extension methods, look at how all objects (which of course means every-

thing in the .NET base class libraries) have a new method named DisplayDefiningAssembly(), while

System.Int32 types (and only integers) have methods named ReverseDigits() and Foo():

static void Main(string[] args)

{

Console.WriteLine("***** Fun with Extension Methods *****\n");