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The first construct is simply a field of the appropriate delegate type This field is a reference to the head of a linked list of delegates that want to be notified of this event This field is initialized to null, meaning that no listeners have registered interest in the event When an object registers interest in the event, this field refers to an instance of the MailMsgEventHandler delegate Each MailMsgEventHandler delegate instance has a pointer to yet another MailMsgEventHandler delegate or to null to mark the end of the linked list When a listener registers interest in an event, the listener is simply adding an instance of the delegate type to the linked list Obviously, unregistering means removing the delegate from the linked list.

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You ll notice that the delegate field, MailMsg in this example, is always private even though the original line of source code defines the event as public The reason for making the delegate field private is to prevent code outside the defining type from manipulating it improperly If the field were public, any code could assign to the field, wiping out all the delegates that have registered interest in the event The second construct the C# compiler generates is a method that allows other objects to register their interest in the event The C# compiler automatically names this function by prepending add_ to the event s name (MailMsg) The C# compiler automatically generates the code that is inside this method The code always calls System.

Delegate s static Combine method, which adds the instance of a delegate to the linked list of delegates and returns the new head of the linked list The third and final construct the C# compiler generates is a method that allows an object to unregister its interest in the event Again, the C# compiler automatically names this function by prepending remove_ to the event s name (MailMsg) The code inside this method always calls Delegate s static Remove method, which removes the instance of a delegate from the linked list of delegates and returns the new head of the linked list You should also notice that both the add and remove methods have a MethodImplAttribute attribute applied to them More specifically, these methods are marked as synchronized, making them thread safe: multiple listeners can register or unregister themselves with the event at the same time without corrupting the linked list.

In this example, the add and remove methods are public The reason they are public is that the original line of source code declared the event to be public If the event had been declared protected, the add and remove methods generated by the compiler would also have been declared protected So, when you define an event in a type, the accessibility of the event determines what code can register and unregister interest in the event, but only the type itself can ever access the delegate field directly In addition to emitting the preceding three constructs, compilers also emit an event definition entry into the managed module s metadata This entry contains some flags and the underlying delegate 188.

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