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Figure 11-1. The C# delegate keyword represents a sealed class deriving from System.MulticastDelegate Now, how exactly does the compiler know how to define the Invoke(), BeginInvoke(), and EndInvoke() methods To understand the process, here is the crux of the compiler-generated BinaryOp class type (bold italic marks the items specified by the defined delegate type): sealed class BinaryOp : System.MulticastDelegate { public int Invoke(int x, int y); public IAsyncResult BeginInvoke(int x, int y, AsyncCallback cb, object state); public int EndInvoke(IAsyncResult result); } First, notice that the parameters and return type defined for the Invoke() method exactly match the definition of the BinaryOp delegate. The initial parameters to BeginInvoke() members (two integers in our case) are also based on the BinaryOp delegate; however, BeginInvoke() will always provide two final parameters (of type AsyncCallback and object) that are used to facilitate asynchronous method invocations. Finally, the return type of EndInvoke() is identical to the original delegate declaration and will always take as a sole parameter an object implementing the IAsyncResult interface. Let s see another example. Assume you have defined a delegate type that can point to any method returning a string and receiving three System.Boolean input parameters: public delegate string MyDelegate(bool a, bool b, bool c); This time, the compiler-generated class breaks down as follows: sealed class MyDelegate : System.MulticastDelegate {

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public string Invoke(bool a, bool b, bool c); public IAsyncResult BeginInvoke(bool a, bool b, bool c, AsyncCallback cb, object state); public string EndInvoke(IAsyncResult result); } Delegates can also point to methods that contain any number of out or ref parameters (as well as array parameters marked with the params keyword). For example, assume the following delegate type: public delegate string MyOtherDelegate(out bool a, ref bool b, int c); The signatures of the Invoke() and BeginInvoke() methods look as you would expect; however, check out the EndInvoke() method, which now includes the set of all out/ref arguments defined by the delegate type: sealed class MyOtherDelegate : System.MulticastDelegate { public string Invoke(out bool a, ref bool b, int c); public IAsyncResult BeginInvoke(out bool a, ref bool b, int c, AsyncCallback cb, object state); public string EndInvoke(out bool a, ref bool b, IAsyncResult result); } To summarize, a C# delegate type definition results in a sealed class with three compiler-generated methods whose parameter and return types are based on the delegate s declaration. The following pseudo-code approximates the basic pattern: // This is only pseudo-code! public sealed class DelegateName : System.MulticastDelegate { public delegateReturnValue Invoke(allDelegateInputRefAndOutParams); public IAsyncResult BeginInvoke(allDelegateInputRefAndOutParams, AsyncCallback cb, object state); public delegateReturnValue EndInvoke(allDelegateRefAndOutParams, IAsyncResult result); }

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So, when you build a type using the C# delegate keyword, you indirectly declare a class type that derives from System.MulticastDelegate. This class provides descendents with access to a list that contains the addresses of the methods maintained by the delegate object, as well as several additional methods (and a few overloaded operators) to interact with the invocation list. Here are some select members of System.MulticastDelegate: public abstract class MulticastDelegate : Delegate { // Returns the list of methods "pointed to."

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