路由匹配规则

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

  1所以有以上的路由规则，一定要写在Defalut之前，否则会被拦截，

  2路由不会先检测常量，只会由上至下，依次匹配，匹配到了，再对比规则，然后再匹配规则（常量的严格匹配），

  所以"/students/Details.aspx"会先被【2】截获，然后常量又不匹配，进而报错

          ////【2】测试{name}-{age}
            routes.MapRoute(
                name: "Test4",
                url: "{name}-{age}",
                defaults: new { controller = "Work", action = "Index", id = UrlParameter.Optional }
            );

            //【5】测试{table}/Details.apx
            routes.MapRoute(
                name: "Test8",
                url: "{table}/Details.aspx",
               defaults: new { controller = "Work", action = "Index" }
            );

 3  “规则有规定，但URL没传，有默认值时，可以匹配该条路由”

controller action id都有默认值，所以href="/blogs/tom/news" 匹配的是规则【2】，规则有，而URL无的时候，取默认值，被2截获

    //【2】测试字面量和常量必须严格匹配
            routes.MapRoute(
                name: "Test2",
                url: "blogs/{author}/{category}/{id}",
                defaults: new { controller = "Work", action = "Index2", id = UrlParameter.Optional }
            );

            //【3】测试字面量和常量必须严格匹配
            routes.MapRoute(
                name: "Test5",
                url: "blogs/{author}/{category}",
                defaults: new { controller = "Work", action = "Index5", id = UrlParameter.Optional }
            );

4 “路由规定没有，而URL有传ID时，需匹配带ID的路由”  "/blogs/tom/news/1"  匹配的是【3】规则无，而rul有的话，继续找，找不到报错。

 //【2】测试字面量和常量必须严格匹配
            routes.MapRoute(
                name: "Test5",
                url: "blogs/{author}/{category}",
                defaults: new { controller = "Work", action = "Index5", id = UrlParameter.Optional }
            );

            //【3】测试字面量和常量必须严格匹配
            routes.MapRoute(
                name: "Test2",
                url: "blogs/{author}/{category}/{id}",
                defaults: new { controller = "Work", action = "Index2", id = UrlParameter.Optional }
            );

5默认值是否配置

 默认值有配置，"/students/Details.aspx" 会被截获

      //【2】测试字面量和常量必须严格匹配
            routes.MapRoute(
                name: "Test2",
                url: "{table}/Details.aspx/{id}",
                defaults: new { controller = "Work", action = "Index2", id = UrlParameter.Optional }
            );

默认值无配置时，，"/students/Details.aspx" 不被截获，缺少ID并不匹配该路由

   //【2】测试字面量和常量必须严格匹配
            routes.MapRoute(
                name: "Test2",
                url: "{table}/Details.aspx/{id}",
                defaults: new { controller = "Work", action = "Index2" }
            );