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A delegate is a simple class that is used to point to methods with a specific signature, becoming essentially a type-safe function pointer. A delegate's purpose is to facilitate a call back to another method (or methods), after one has been completed, in a structured way.
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Now the delegate contains both a reference to the function "ButtonClicked" and the instance, "this", which the method is called on. The instance "this" in the MyWindow constructor and "this" in ButtonClicked are the same. This is a specific case of a concept known as closures which allows "saving" the state - the current object, local variables, etc. - when creating a delegate. In the above ... The only way to create/use a delegate was to define your own new delegate type (or find/guess some suitable one somewhere deep in the system's namespaces). Keep in mind that every new delegate-type is a new class. Further, while the number of classes one would need when using pseudo-delegates would be greater than when using "real" delegates, each pseudo-delegate would only need to hold a single object instance.
MulticastDelegate class (the class behind delegate keyword) do have a list of invocations, but this list is immutable. Each time you combine delegates with the += operator, a new MulticastDelegate instance get created combining the invocation list of the former two Delegate objects. Here Delegate is added using the += operator and removed using the -= operator. Delegate types are derived from the Delegate class in the .NET Framework. Delegate types are sealed—they cannot be derived. Because the instantiated delegate is an object, it can be passed as a parameter, or assigned to a property. A delegate is a Queue of function pointers, invoking a delegate may invoke multiple methods. A lambda is essentially an anonymous method declaration which may be interpreted by the compiler differently, depending on what context it is used as. c# - What is the difference between lambdas and delegates in the .NET ... Delegate in C# is eqv. to function pointer in C, but it also carries a reference to the class instance that it was created from. All event handlers in Windows Forms are delegates.
Для того чтобы лучше понять хотел знать чем отличается event от delegate и ещё применение операторов += и -= для методов в C# A delegate is a class that wraps a pointer or reference to an object instance, a member method of that object's class to be called on that object instance, and provides a method to trigger that call. But more to the point, both Func and delegate string convertMethod(string) would be capable of holding the same method definitions whether they be methods, anonymous methods, or lambda expressions. As for which you should use, depends on the situation. If you want your delegate to be defined more by what it takes and returns, then the generic delegates are perfect. If you want ... Delegate are essentially inline Action 's or Func. You can declare a delegate outside the scope of a method which you are running or using a lambda expression (=>); because you run the delegate within a method, you run it on the thread which is being run for the current window/application which is the bit in bold. All of the Func delegates return a value. What are the .NET delegates that can be used with methods that return void? No difference. Action is a predefined delegate, intended to save you the trouble of repeatedly defining new delegates. When to use a delegate or action Typically, a delegate (and action) is used in places where you need to have table-driven functionality. i.e., maybe a dictionary of methods corresponding to some particular requirement. Tie G U Style TIE G Solid Satin Woven dyed Color Formal Black Necktie and Pocket Square Sets in Gift Box 1K+ bought in past month Add to cart A comprehensive step by step guide on the different ways to tie a tie. Windsor, 4 in hand, Eldredge, Trinity, bow tie, and other simple knots from Ties.com How To Tie A Necktie | Different Ways Of Tying A Tie | Ties.com Find a great selection of Men's Ties, Bow Ties & Pocket Squares at Nordstrom.com. Find velvet, patterned, silk, and more. Shop from top brands like Ted Baker, Eton, and more.
