C＃抱怨没有实现接口方法

Question

namespace RepositoryFactory.Interface
{
    public interface ISelectionFactory<TIdentityObject> 
    {

        DbCommand ConstructSelectCommand(Database db, TIdentityObject idObject);
    }
}


namespace SafetypadDAL
{
    public class T_INCIDENT_SelectFactory:ISelectionFactory<T_INCIDENT>
    {
        public DbCommand ConstructSelectCommand(Database db, T_INCIDENT idObject)
        {
            //my business codes will be here

            return command;
        }
    }
}

This is that program.

Here you can not find any wrong signature.

Answer 1

You may have implemented a method called ConstructSelectCommand but with the wrong signature, so it wouldn't match the method.

If you're using VS2005 or later, click in the interface name in your class declaration, and press Ctrl and period (dot). It will offer to generate the method stubs for you.

If you really, really think you've done the right thing, please post your declaration of that method. Are you sure you've made it public, for instance? (Or implemented the interface explicitly, of course.)

EDIT: Is it possible that Database in the two signatures refer to different types? What happens if you try what I suggested in terms of getting Visual Studio to generate the stub?

Answer 2

You haven't implemented it. Post the relevant part of the code, if you like. Probably you can event instruct your IDE to attempt the implementation for you, just to get the exact signature.