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c#genericsgeneric-method
Kyle Baran
Kyle Baran

Reputation: 1839

Generic methods with constraints that are generic

What I want to do is have a method that takes a generic type as a parameter with a constraint. However, the constraint's type also has a second generic type, but I want the method to work regardless of what the second typing is:

public class IEvent<T> where T : EventArgs { }
public class EventManager
{
    public void DoMethod<T>() where T: IEvent<???>
    {
    }
}

Specifically, I'm trying to have my EventManager class receive any kind of event and then do something with it. Am I overcomplicating things, or is this doable?

Upvotes: 5

Views: 118

Answers (2)

D J
D J

Reputation: 7018

Try this.

public class IEvent<T> where T : EventArgs { }
public class EventManager
{
    public void DoMethod<T, U>() where T : IEvent<U> where U : EventArgs
    {
    }
}

Upvotes: 1

phoog
phoog

Reputation: 43076

You have to use a second constraint:

void DoMethod<TEvent, TArgs>() where TEvent : IEvent<TArgs> where TArgs : EventArgs {}

Upvotes: 11

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