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What are the different types of Delegates?

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Single Delegate – A delegate which can call a single method.

Multicast Delegate – A delegate which can call multiple methods. + and – operators are used to subscribe and unsubscribe respectively.

Generic Delegate – It does not require an instance of delegate to be defined. It is of three types, Action, Funcs and Predicate.

  • Action– In the above example of delegates and events, we can replace the definition of delegate and event using Action keyword. The Action delegate defines a method that can be called on arguments but does not return a result

Public delegate void deathInfo();

Public event deathInfo deathDate;

//Replacing with Action//

Public event Action deathDate;

Action implicitly refers to a delegate.

  • Func – A Func delegate defines a method that can be called on arguments and returns a result.

Func <int, string, bool> myDel is same as delegate bool myDel(int a, string b);

  •  Predicate – Defines a method that can be called on arguments and always returns the bool.

Predicate<string> myDel is same as delegate bool myDel(string s);

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