CODEWITHSUNDEEP
c#typesdelegates
holroy
holroy

Reputation: 3127

Equivalent of typedef in c# for Action<> and/or Func<>

After googling it doesn't look promising, but I'm wondering if there is some way of aliasing or typedef'ing when using Action<T> or Func<in T, out TResult> in C#?

I've already seen Equivalent of typedef in c#, which says that within one compile scope you can use the using construct for some cases, but that doesn't seem to apply to Action's and Func's as far as I can tell.

The reason I want to do this is that I want an action to be used as a parameter to several functions, and if I, at some point in time, decide to change the action it's a lot of places to change both as parameter types and as variable types.

?typedef? MyAction  Action<int, int>;

public static SomeFunc(WindowClass window, int number, MyAction callbackAction) {
   ...
   SomeOtherFunc(callbackAction);
   ...
}

// In another file/class/...
private MyAction theCallback;

public static SomeOtherFunc(MyAction callbackAction) {
    theCallback = callbackAction;
}

Are there some construct to use, which can define the MyAction as indicated in the code segment?

Upvotes: 10

Views: 5384

Answers (2)

holroy
holroy

Reputation: 3127

After some more searching, it seems as though delegate's comes to the rescue (see Creating delegates manually vs using Action/Func delegates and A: Custom delegate types vs Func and Action). Please comment as to why this is not a solution or possible pitfalls.

With delegates I can rewrite the first line the given code example:

public delegate void MyAction(int aNumber, int anotherNumber);
// Keep the rest of the code example

// To call one can still use anonymous actions/func/...
SomeFunc(myWindow, 109, (int a, int b) => Console.Writeline);

Upvotes: 10

Jegan
Jegan

Reputation: 1237

using System;

namespace Example
{
    using MyAction = Action<int>;

    internal class Program
    {
    }

   private void DoSomething(MyAction action)
   {
   }
}

Upvotes: 6

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