Need some help on DecorateAllWith in WebApi about mediatr HOT 2 CLOSED

    public IDependencyScope BeginScope()
    {
        //IContainer child = this.Container.GetNestedContainer();
        //return new StructureMapWebApiDependencyResolver(child);
        var resolver = new StructureMapWebApiDependencyResolver(CurrentNestedContainer);

        ServiceLocatorProvider provider = () => resolver;

        CurrentNestedContainer.Configure(cfg =>
        {
            cfg.For<ServiceLocatorProvider>().Use(provider);
            cfg.For(typeof(IRequestHandler<,>)).DecorateAllWith(typeof(ValidatorHandler<,>));
        });
        return resolver;
    }

public class ValidationRequestHandler<TRequest, TResponse> : IRequestHandler<TRequest, TResponse> 
    where TRequest : IRequest<TResponse>
{
    private readonly IRequestHandler<TRequest, TResponse> _innerHander;
    private readonly IValidator<TRequest>[] _validators;

    public ValidationRequestHandler(IRequestHandler<TRequest, TResponse> innerHandler,
          IValidator<TRequest>[] validators)
    {
        _validators = validators;
        _innerHander = innerHandler;
    }