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c# question - Generic Dictionary

Started by FreJa Apr 13, 2009 at 9:30 AM 2 replies 1.3k views

Original Post

Apr 13, 2009 at 9:30 AM

Hi, At the moment I have and Interface which has this method:


Dictionary<string, T> GetAll();

Is there any way I can have a generic key? Instead of string? So the implementations of this interface can declare Dictionary GetAll(); or Dictionary GetAll(); ? Thanks!

Telastyn

268

Telastyn

Apr 13, 2009 at 10:01 AM

By adding a generic parameter to the owning class (or the method itself I suppose).

It might help if we knew what you're trying to do.

FreJa

Author

FreJa

Apr 13, 2009 at 10:08 AM

Quote:
Original post by Telastyn
By adding a generic parameter to the owning class (or the method itself I suppose).

Right, but I already have a generic parameter (T) for the value of the dictionary, how do I add one to the key?

Quote:
It might help if we knew what you're trying to do.

I'm implementing the repository pattern. My repository interface looks like this now:

public interface IRepository<T>    {        T GetById(int id);        Dictionary<string, T> GetAll();        void Add(T entity);        void Update(T entity);        void Remove(T entity);    }

And now I want to have to implementations of this interface, one for a User where I want the GetAll() method to return a Dictionary, and one for a Contact where I want the GetAll() to return a Dictionary. So, how do I make the dictionary key generic?

Thanks again

Telastyn

268

Telastyn

Apr 13, 2009 at 10:59 AM

public interface IRepository<K,V>    {        V GetById(int id);        Dictionary<K, V> GetAll();        void Add(V entity);        void Update(V entity);        void Remove(V entity);    }

Perhaps something that is not suitable to your design, but how it could be done.

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