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[book] [en] Pro C# 2008 and the NET 3.5 Platform Fourth Edition

CTS Delegate Types

Delegates are the .NET equivalent of a type-safe C-style function pointer. The key difference is that a

.NET delegate is a 



class that derives from System.MulticastDelegate, rather than a simple pointer to

a raw memory address. In C#, delegates are declared using the delegate keyword:



// This C# delegate type can "point to" any method

// returning an integer and taking two integers as input.

delegate int BinaryOp(int x, int y);

Delegates are useful when you wish to provide a way for one entity to forward a call to another

entity, and provide the foundation for the .NET event architecture. As you will see in Chapters 11

and 18, delegates have intrinsic support for multicasting (i.e., forwarding a request to multiple

recipients) and asynchronous method invocations.




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