Generic method with multiple optional constraints but only one Generic Parameter (c#)

Question

Is something like this even possible. I want the case, that it executes, when T is MyClass or MyOtherClass.

public T Method<T>()
   where T: MyClass, T: MyOtherClass
   { //execution }

Why would that be useful? Does MyClass and MyOtherClass have something in common? — Sweeper
– Sweeper, Commented Sep 7, 2021 at 10:18
That wouldn't be particularly generic, though. And no, it's not possible (not counting explicit runtime checks). You could have a MethodMyClass and MethodMyOtherClass. — Jeroen Mostert
– Jeroen Mostert, Commented Sep 7, 2021 at 10:20
What are you actually trying to do? It almost looks like you want to use Discriminated Unions, like those found in TypeScript or F#. You can't do this easily in C# yet, not even C# 10, as DUs were pushed to vNext once again. There may be other ways to get the same functionality though — Panagiotis Kanavos
– Panagiotis Kanavos, Commented Sep 7, 2021 at 10:24

Misha Zaslavsky · Accepted Answer · 2021-09-07 10:27:18Z

3

This is not possible but you can use an interface for this.

For example:

public interface IMyInterface...

public class MyClass : IMyInterface...

public class MyOtherClass : IMyInterface...

public T Method<T>() where T : IMyInterface...

edited Sep 7, 2021 at 10:27

answered Sep 7, 2021 at 10:20

Misha Zaslavsky

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2 Comments

Misha Zaslavsky Over a year ago

@PanagiotisKanavos Yes, that's possible to use some constraints, but not 2 classes as the class type should always be the first one. In the question, he wants 2 classes.

Panagiotis Kanavos Over a year ago

I noticed that or only afterr Jeroen Mosfert pointed it out.

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