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

string extension = ConfigurationManager.AppSettings["ExtensionName"] ?? string.Empty;

extension = string.IsNullOrWhiteSpace(extension) ? string.Empty : "." + extension;

string[] _namespace = new string[] { "MvcBlog_Example.Controllers" };

routes.MapRoute("AllBlogs",
                "",
                new { controller = "Blog", action = "AllBlogs" },
                null,
                _namespace
            );

//实现http://localhost:5680/User1 (不带/home.jsp)
            routes.MapRoute("BlogUser",
                "{userName}",
                new { controller = "Blog", action = "home" },
                new { userName = @"\w{5,}" },
                _namespace
            );

//示范访问地址http://localhost:5680/User1/home.jsp
            routes.MapRoute("Blog",
                "{userName}/{action}" + extension,
                new { userName = "dotNetDR_", action = "home", controller = "Blog" },
                new { userName = @"\w{5,}" }, //用户名最少5个字母或数字或下划线
                _namespace
            );

/* 你会发现当你输入/aa/home.jsp时~MVC会返回404错误页
             * 而输入/aa123/home.jsp时~MVC才会正确地跳转到404.jsp友显示页上!
             *
             * 实现404友好页
             */
            routes.MapRoute("NotFound",
                "404" + extension,
                new { controller = "Blog", action = "NotFound" },
                null, _namespace
            );
        }