var con = ConfigurationManager.AppSettings["MyConnectionString"];
            var paramStringCon = new ParameterOverrides();
            container.RegisterType<StringCon>();
            container.Resolve<StringCon>(new ResolverOverride[]
            {
                new ParameterOverride("str", con)
            });
            
            var logProd = container.Resolve(typeof(Microsoft.Extensions.Logging.ILogger<ProductoRepository>));

                container.RegisterType<ProductoRepository>(nameof(ProductoRepository),
                new InjectionConstructor(container.Resolve<StringCon>(new ResolverOverride[]
            {
                new ParameterOverride("str", con)
            }), logProd));
             new UnityDependencyResolver(container);
            DependencyResolver.SetResolver(new UnityDependencyResolver(container));