How to declare generic event for generic delegate in c#

Question

I have a user control which deals with fileupload. I have defined a delegate as follows

public delegate void FileUploadSuccess(T value,FileUploadTyp         


        

Answer 1

To the outside world, an event in many ways looks like a field of the class. Just as you can't use an open generic type to declare a field, you can't use an open generic type to declare an event.

If you could leave the type open, then the compiler would have to compile in the event handler add and remove code for every possible type for your generic parameter T. A closed generic type can't be JIT compiled, because your event is not a type in its own right, rather is a part of an enclosing type.