How to use generic type parameters in a c# interface

Question

I have

public interface IPersistedModel<TModel, TIdentifier>

I'd like to define an interface where I have a generic method that uses the generic type parameters from the above. Is there a way to do this? I've tried the following but neither compiles.

public interface IModelCollection1<IPersistedModel<TModel, TIdentifier>>
{
    IEnumerable<TModel> ReadCollection(TIdentifier identifier);
}

or

public interface IModelCollection2<T> where T : IPersistedModel<TModel, TIdentifier>
{
    IEnumerable<TModel> ReadCollection(TIdentifier identifier);
}

Reed Copsey · Accepted Answer · 2012-06-29 15:33:41Z

3

Unfortunately, you need to include the generic types in the interface itself:

public interface IModelCollection<T, TModel, TIdentifier> 
       where T : IPersistedModel<TModel, TIdentifier>
{
    IEnumerable<TModel> ReadCollection(TIdentifier identifier);
}

answered Jun 29, 2012 at 15:33

Reed Copsey

567k80 gold badges1.2k silver badges1.4k bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Rzv.im · Accepted Answer · 2012-06-29 15:33:31Z

0

You can simply use a generic method which adds generic parameters only to that method

class A
{

static void Swap<T>(ref T lhs, ref T rhs)
{
    T temp;
    temp = lhs;
    lhs = rhs;
    rhs = temp;
}

}

answered Jun 29, 2012 at 15:33

Rzv.im

1,0289 silver badges12 bronze badges

Comments

marvc1 · Accepted Answer · 2012-06-29 15:35:51Z

0

Try this:

public interface Ione <T, U> where T : IInterfaceOne<T> where U : IInterfaceTwo<U>
{

}

public interface IInterfaceOne<T>
{

}

public interface IInterfaceTwo<U>
{

}

answered Jun 29, 2012 at 15:35

marvc1

3,7193 gold badges29 silver badges34 bronze badges

Collectives™ on Stack Overflow

How to use generic type parameters in a c# interface

3 Answers 3

Comments

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related