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copied!<p>1) the Action delegates </p> <pre><code>(Action, Action<T>, Action<T, T2> ...) </code></pre> <p>are general purpose delegate to avoid the creation of to many delegate in your application. The idea is :</p> <pre><code>//- Action => void method with 0 args //- Action<T> => void method with 1 arg of type T //- Action<T, T2> => void method with 2 args of type T et T2 //... </code></pre> <p>2) that dictionary stores for each 'SomeEnum' values, a method wicth match this signature :</p> <pre><code>void MethodExample (User arg); </code></pre> <p>Here is an example : </p> <pre><code>public Init() { deleteUserMethodsByStatus = new Dictionary<SomeEnum, Action<User>>(); deleteUserMethodsByStatus.Add(UserStatus.Active, user => { throw new BusinessException("Cannot delete an active user."); }); deleteUserMethodsByStatus.Add(UserStatus.InActive, DoUserDeletion}); } //This is how you could use this dictionary public void DeleteUser(int userId) { User u = DaoFactory.User.GetById(userId); deleteUserMethodsByStatus[u.Status](u); } //the actual deletion process protected internal DoUserDeletion(User u) { DaoFactory.User.Delete(u); } </code></pre> <p>3) Difference between Action , Function ,Predicate : - an action is a void method(no return value) - a function is a non void method (has a return value) - a predicate must return a boolean value and take 1 argument (it basically answere yes or no to question that take 1 argument)</p> <p>I hope this help.</p>

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