路由数据 RouteData.Values[key]

RoutData.values[Key] 只能获取路由定义中的数据，url参数的数据不包含在里面

https://i.cnblogs.com/EditPosts.aspx?opt=1

路由：域名到？之间    -->EditPosts.aspx

URL参数：？之后         -->opt=1

//View页面添加链接
 <a href='@Url.Action("StudentDetail","Student",new {id=1001,age=20,gender=1})'>查看学员详情</a>

//路由表
  routes.MapRoute(
                name: "Default",
                url: "{controller}/{action}/{id}",
                defaults: new { controller = "Home", action = "Index", id = 10 }
            );

//映射得到的地址如下
<a href="/Student/StudentDetail/1001?age=20&amp;gender=1">查看学员详情</a>

　　//控制器中方法
     public ActionResult StudentDetail(int age,int gender)
        {
           //使用的是RouteData中的数据
            ViewBag.id =RouteData.Values["id"];
             //使用的是方法的参数映射
            ViewBag.age=age;
            ViewBag.gender = gender;
            return View();
        }

//StudentDetail视图中的展示
<div>
        @*在视图中输出控制器中获取的数据*@
        @ViewBag.id<br />
        @ViewBag.gender<br />
        @*在视图中直接输出*@
        @ViewContext.RouteData.Values["controller"]
        <br />
        @*在视图中遍历*@
        @{
            foreach (KeyValuePair<string, object> data in @ViewContext.RouteData.Values)
            {
                var info = data.Key + ":" + data.Value;
                @info @*显示到页面*@<br />
            }
        }
    </div>

 1001        //
 1
 Student    
 //因为路由中只有以下三个参数，所以，不会遍历获取到age及gender     
 controller:Student
 action:StudentDetail
 id:1001

修改路由规则后

//链接配置
<a href='@Url.Action("StudentDetail","Student",new {id=1001,age=20,gender=1})'>查看学员详情</a>


//路由规则
    routes.MapRoute(
            name: "Test1",
            url: "{controller}/{action}/{id}/{age}/{gender}",
            defaults: new { controller = "Home", action = "Index", id = 10 }
        );

//生成的a标签
<a href="/Student/StudentDetail/1001/20/1">查看学员详情</a>

//遍历RouteData.values结果如下
 controller:Student
 action:StudentDetail
 id:1001
 age:20
 gender:1