C# Generic Method Ambiguity

Question

I need to use generic methods and non-generic methods in the same interface.

public interface IBRClientActions<T> where T : class { T add(T element); Hashtable add(Hashtable hashtable); void update(T element); void update(Hashtable hashtable); }

After I implement this interface in other interface with many type

public interface IBRClientActions : IBRClientActions<AdresseClient>, IBRClientActions<Role>, IBRClientActions<LienClient> { ... }

in my final class I need something like that

public class FinalClass : IBRClientActions { AdresseClient add(AdresseClient element) { ... } Hashtable add**<AdresseClient>**(Hashtable hashtable) { ... } .... }

But Hashtable add<AdresseClient>(Hashtable hashtable) { ... } is not possible Actually I have ambiguous reference in methods with Hashtable.

How can I have an add method with Hashtable for each type?

Edit 1

Explicit interface implementation

Yes that is a possibility but with this solution I need to cast my class each time

Hashtable htRole = new Hashtable(); FinalClass myClass = new FinalClass(); /* not correct, ambiguity */ myClass.add(htRole); /* correct, no ambiguity but heavy writing (sorry for my bad english) */ ((IBRClientActions<Role>)myClass).add(htRole);

Jon Skeet · Accepted Answer · 2012-09-14 10:52:57Z

I need to use generic methods and non-generic methods in the same interface.

I don't think that's the problem, really. I think the real problem is that you're implementing the same generic interface multiple times with different type arguments in the same class. Without that aspect, you wouldn't have a problem here.

You can use explicit interface implementation:

Hashtable IBRClientActions<Role>.add(Hashtable hashatable) { ... }

But this becomes ugly pretty quickly. I'd try to avoid doing this if possible. Try using composition instead of inheritance.

Also note:

If this is System.Collections.Hashtable, you should probably be using System.Collections.Generic.Dictionary<,> if possible
The method name add doesn't conform to .NET naming conventions

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