public class UserRoute : RouteBase
    {


        /// <summary>
        /// 生成url
        /// </summary>
        /// <param name="requestContext"></param>
        /// <param name="values"></param>
        /// <returns></returns>
        public override VirtualPathData GetVirtualPath(RequestContext requestContext, RouteValueDictionary values)
        {
            string id = values["id"] as string ?? string.Empty;
            //判断是否有id参数 return nul后继续匹配
            
            //判断是否存在controller键且为home的控制器
            if (!values.ContainsKey("controler") || !values["controler"].ToString().Equals("Home", StringComparison.OrdinalIgnoreCase))
                return null;
            //判断是否存在action键且为Test的方法
            if (!values.ContainsKey("action") || !values["action"].ToString().Equals("Test", StringComparison.OrdinalIgnoreCase))
                return null;// throw new ArgumentNullException("category");//找不到分类抛出异常
            //开始生成url
            var path = "ta_t1";
            //返回当前重写的url
            return new VirtualPathData(this, path);
        }



        /// <summary>
        /// 处理点击的重写url
        /// </summary>
        /// <param name="httpContext"></param>
        /// <returns></returns>
        public override RouteData GetRouteData(System.Web.HttpContextBase httpContext)
        {
            //获取地址栏中的路径
            var path = httpContext.Request.AppRelativeCurrentExecutionFilePath + httpContext.Request.PathInfo;
            path = path.Substring(2).Trim('/');//截取获取的字符串，
            if (!path.StartsWith("ta_")) return null;//判断path中是否是ta_开头的格式
            var lastpath = path.Split('_').Last();//获取_后面的路径
            /*
             其他判断逻辑
             */

            var data = new RouteData(this, new MvcRouteHandler());//声明一个RouteData，添加相应的路由值
            data.Values.Add("controller", "Home");
            data.Values.Add("action", "Test");
            //data.Values.Add("id", 1);

            return data;//返回这个路由值将调用
        }

       
    }