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c#genericsgeneric-type-argument
vexe
vexe

Reputation: 5615

An unexpected "The non-generic type cannot be used with the type arguments"?

I have the following hierarchy of classes:

public abstract class SerializedDelegateBase<TDelegate, TTarget>
    where TDelegate : class
    where TTarget : class
{
   ...
}

public abstract class SerializedMBDelegateBase<TDelegate> : SerializedDelegateBase<TDelegate, MonoBehaviour> where TDelegate : class
{
   ...
}

public class ParameterizedSerializedDelegate<T> : SerializedMBDelegateBase<Action<T>> where T : EventArgs
{
   ...
}

And finally:

[Serializable]
public class OnTransitionArg : EventArgs
{
    public string TransitionName { set; get; }
}

[Serializable]
public class OnTransitionDelegate : ParameterizedSerializedDelegate<OnTransitionArg> { }

Now for some strange reason, I'm getting "The non-generic type 'ParameterizedSerializedDelegate' cannot be used with type arguments" on my OnTransitionDelegate when I'm inheriting from ParameterizedSerializedDelegate

I have no idea why.

Anybody?

Thanks!

EDIT:

I should probably mention that the classes are in different files. I just tried a minimal but similar setup in terms of the generic arguments in one file, it worked! - I don't know what's different about my real setup...

Upvotes: 1

Views: 6257

Answers (2)

Dr Rob Lang
Dr Rob Lang

Reputation: 6902

@vexe's solution worked for me but I worked out what I did to reproduce it (explanation will use original question type names).

In VS2013, this can happen when you are using the CTRL-. shortcut menu and not paying attention. Rather than choosing "Add << namespace >>", it is possible to select "Generate class for...", which will create a new stub class called ParameterizedSerializedDelegate in the same folder as OnTransitionDelegate.

What is confusing is that if you hit F12 (go to definition) on ParameterizedSerializedDelegate in the example above, it will find the generic version of it and take you there - even if the namespace is not available in that file.

Upvotes: 0

vexe
vexe

Reputation: 5615

It seems that I was editing 'another' version of the ParameterizedSerializedDelegate file - and so the one VS was looking at was different.

Upvotes: 2

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