Mediator.cs

    public class Mediator : IMediator
    {
        private readonly IContainer _container;

        public Mediator(IContainer container)
        {
            _container = container;
        }

        public void Send<TCommand>(TCommand command) where TCommand : ICommand
        {
            var handlerType =
                typeof(ICommandHandler<>).MakeGenericType(command.GetType());

            dynamic handler = _container.GetInstance(handlerType);

            handler.Handle((dynamic)command);
        }

        public TResult Send<TResult>(object query)
        {
            var handlerType =
                typeof (IQueryHandler<,>).MakeGenericType(query.GetType(), typeof (TResult));

            dynamic handler = _container.GetInstance(handlerType);

            return handler.Handle((dynamic)query);
        }
    }