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c#generics
Arnold Zahrneinder
Arnold Zahrneinder

Reputation: 5200

Generics: Where T is TypeA OR TypeB

When dealing with generics we can do where T: TypeA, TypeB which means T must be implementing both TypeA and TypeB. But is it possible to use an OR in this expression? For example where T: TypeA || TypeB ? is there anyway to do this?

Upvotes: 3

Views: 131

Answers (2)

DavidG
DavidG

Reputation: 118937

The only way to achieve this would be to make TypeA and TypeB inherit or implement the same parent class or interface. For example:

public interface IParent
{
}

public class TypeA : IParent
{
    //snip
}

public class TypeB : IParent
{
    //snip
}

Then you can use

public class Blah<T> where T: IParent
{
}

Upvotes: 7

usr
usr

Reputation: 171188

That is not possible and it wouldn't really make sense. You could never rely on T having certain members available because it could be A or B. All members are optional then.

It certainly is conceivable to have this feature but it goes against the spirit of generics. This would only be useful in a reflection situation.

Upvotes: 8

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