1 using System.Web;
 2 using System.Web.Routing;
 3  
 4 namespace URLsAndRoutes.Infrastructure {
 5  
 6     public class UserAgentConstraint : IRouteConstraint {
 7         private string requiredUserAgent;
 8  
 9         public UserAgentConstraint(string agentParam) {
10             requiredUserAgent = agentParam;
11         }
12  
13         public bool Match(HttpContextBase httpContext, Route route, string parameterName,
14                           RouteValueDictionary values, RouteDirection routeDirection) {
15  
16             return httpContext.Request.UserAgent != null &&
17                 httpContext.Request.UserAgent.Contains(requiredUserAgent);
18         }
19     }
20 } 

 1 public static void RegisterRoutes(RouteCollection routes) {
 2  
 3     routes.MapRoute("MyRoute", "{controller}/{action}/{id}/{*catchall}",
 4         new { controller = "Home", action = "Index", id = UrlParameter.Optional },
 5         new {
 6             controller = "^H.*", action = "Index|About",
 7             httpMethod = new HttpMethodConstraint("GET", "POST"),
 8             customConstraint = new UserAgentConstraint("IE")
 9         },  
10         new[] { "URLsAndRoutes.Controllers" });
11 } 

十二、mvc将URL路由到磁盘文件

 1 public static void RegisterRoutes(RouteCollection routes) {
 2  
 3     routes.RouteExistingFiles = true;
 4  
 5     routes.MapRoute("DiskFile", "Content/StaticContent.html",
 6         new {
 7             controller = "Account", action = "LogOn",
 8         },
 9         new {
10             customConstraint = new UserAgentConstraint("IE")
11         });
12  
13     routes.MapRoute("MyRoute", "{controller}/{action}/{id}/{*catchall}",
14         new { controller = "Home", action = "Index", id = UrlParameter.Optional },
15         new {
16             controller = "^H.*", action = "Index|About",
17             httpMethod = new HttpMethodConstraint("GET", "POST"),
18             customConstraint = new UserAgentConstraint("IE")
19         },
20         new[] { "URLsAndRoutes.Controllers" });
21 }

我们把RouteExistingFiles属性设置为true，表示存在的文件也走路由，上面我们把Content/StaticContent.html这个文件映射到controller 为Account，action 为LogOn中了，而并不是指磁盘中存在的文件。基于asp.net mvc的这个特性我们就可以实现mvc以.html结尾的伪静态

 1 public static void RegisterRoutes(RouteCollection routes) {
 2  
 3     routes.RouteExistingFiles = true;
 4  
 5     routes.MapRoute("DiskFile", "Content1/StaticContent.html",
 6         new {
 7             controller = "Account", action = "LogOn",
 8         },
 9         new {
10             customConstraint = new UserAgentConstraint("IE")
11         });
12  
13     routes.IgnoreRoute("Content/*{filename}");
14      routes.MapRoute("", "{controller}/{action}");  
15       
16 }