API_7.WebApiConfig.Register C# (CSharp) Method

        public static void Register(HttpConfiguration config)
        {
            // Web API 配置和服务

            // Web API 路由
            config.MapHttpAttributeRoutes();

            config.Routes.MapHttpRoute(
                name: "DefaultApi",
                routeTemplate: "api/{controller}/{action}/{id}",
                defaults: new { id = RouteParameter.Optional }//,
                //constraints:new{sss=new HttpMethodConstraint(HttpMethod.Post)}

            );
            HttpRouteValueDictionary defaults = new HttpRouteValueDictionary();
            //defaults.Add("controller", "Demo");
            //defaults.Add("action", "Get");
            defaults.Add("val", 0);
            HttpRouteValueDictionary constraints = new HttpRouteValueDictionary();
            constraints.Add("val",new DoubleRouteConstraint());

            HttpRoute route = new HttpRoute("customer/{controller}/{action}/{val}", defaults, constraints);

            config.Routes.Add("CustomerApi",route);
        }