MVC自定义路由02-实现IRouteConstraint限制控制器名

通过实现IRouteConstraint接口，实现对某个控制名进行限制。本篇把重点放在自定义约束，其余部分参考：

MVC自定义路由01-为什么需要自定义路由 

  自定义约束前

using System.Web.Mvc;
using System.Web.Routing;
using MvcApplication2.Extension;

namespace MvcApplication2
{
    public class RouteConfig
    {
        public static void RegisterRoutes(RouteCollection routes)
        {
            routes.IgnoreRoute("{resource}.axd/{*pathInfo}");

            //默认
            routes.MapRoute(
                name: "Default",
                url: "{controller}/{action}/{id}",
                defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional }
            );
        }
    }
}

效果

 

  自定义约束后

□ 实现IRouteConstraint接口

using System;
using System.Web.Routing;

namespace MvcApplication2.Extension
{
    public class ExcludeController : IRouteConstraint
    {
        private readonly string _controller;

        public ExcludeController(string controller)
        {
            _controller = controller;
        }
        public bool Match(System.Web.HttpContextBase httpContext, Route route, string parameterName, RouteValueDictionary values, RouteDirection routeDirection)
        {
            //如果路由中拿到的controller值与约束设定的值相等，就返回false
            return !string.Equals(values["controller"].ToString(), _controller, StringComparison.OrdinalIgnoreCase);
        }
    }
}

□ 路由添加约束

using System.Web.Mvc;
using System.Web.Routing;
using MvcApplication2.Extension;

namespace MvcApplication2
{
    public class RouteConfig
    {
        public static void RegisterRoutes(RouteCollection routes)
        {
            routes.IgnoreRoute("{resource}.axd/{*pathInfo}");

            //默认
            routes.MapRoute(
                name: "Default",
                url: "{controller}/{action}/{id}",
                defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional },
                constraints: new { controller = new ExcludeController("RentalProperties") }
            );
        }
    }
}

效果

可见，加上自定义约束后，带RentalProperties名称的控制器将被限制。