在一个route中，通过在大括号中放一个占位符来定义( { and } )。当解析URL的时候，符号“/”和“.”被作为一个定义符来解析，而定义符之间的值则匹配到占位符中。route定义中不在大括号中的信息则作为常量值。
下面是一些示例URL：

Valid route definitions

Examples of matching URL

{controller}/{action}/{id}

/Products/show/beverages

{table}/Details.aspx

/Products/Details.aspx

blog/{action}/{entry}

/blog/show/123

{reporttype}/{year}/{month}/{day}

/sales/2008/1/5
 
 routes.MapRoute(
                "Default",
                "{controller}/{action}/{id}",
                new { action = "Index", id = "0" },
                new { controller = @"^\w+", action = @"^\w+", id = @"^\d+" });

            // Archive/2008-05-07
            routes.MapRoute(
                "BlogArchive",
                "Archive/{date}",
                new { controller = "Blog", action = "Archive" },
                new { date = @"^\d{4}-\d{2}-\d{2}" });

            // Car/bmw.abc
            routes.MapRoute(
                "Car",
                "Car/{make}.{model}",
                new { controller = "Car", action = "Index" },
                new { make = @"(acural|bmw)" });

            //必须是提交post url直接回车是get
            routes.MapRoute(
                "Book",
                "Book/Add/{name}",
                new { controller = "Book", action = "Add" },
                new { httpMethod = "POST" });

            //后面所有东西都捕获
            routes.MapRoute(
                "CatchIt",
                "Product/{*values}",
                new { controller = "Product", action = "Index" });

 

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