Unity Auto Register ICommandHandler

Question

What about, I have a several classes that implement the ICommanHandler <> interface several times, as I can do with Unity to register them automatically and not one by one. Thank you.

public class CarCommandHandler:ICommandHandler<CreateCar>
                               ICommandHandler<DeleteCar>
{
    ......
}


public class EngineCommandHandler:ICommandHandler<CreateEngine>
                                  ICommandHandler<DeleteEngine>
{
    ......
}



public static void RegisterTypes(IUnityContainer container)
{
   container.RegisterType<ICommandHandler<CreateCar>, CarCommandHandler>();

   container.RegisterType<ICommandHandler<DeleteCar>, CarCommandHandler>();

   container.RegisterType<ICommandHandler<CreateEngine>, EngineCommandHandler>();

   container.RegisterType<ICommandHandler<DeleteEngine>, EngineCommandHandler>(); 
}

Answer 1

You need to iterate all of types that implement ICommandHandler<> and register them. Code is below can do that:

    public static void RegisterAllImplementations(this UnityContainer container, Type openInterfaceType)
    {
        int registerCount = 0;
        // Iterate all types from current assembly
        foreach (var typeItem in Assembly.GetExecutingAssembly().GetTypes())
        {
            foreach (var interaceItem in typeItem.GetInterfaces())
            {
                if (interaceItem.IsGenericType && interaceItem.GetGenericTypeDefinition() == openInterfaceType)
                {
                    container.RegisterType(interaceItem, typeItem, $"{registerCount++}");
                }
            }
        }
    }

An invocation:

    var container = new UnityContainer();
    container.RegisterAllImplementations(typeof(ICommandHandler<>));

Let me know if something doesn't work