WebForms使用System.Web.Routing

老赵同学写过 在Web应用程序开发过程中利用ASP.NET MVC框架的实战技巧 ，Routing现在可以作为URLRewriting技术的替代者，出现在asp.net mvc框架中，将它应用于WebForms上也是很简单的，可以到codeplex上下载 ASP.NET MVC WebFormRouting Demo。

实现的原理也是很简单的：

1、创建一个自定义的实例化你的页面的 IRouteHandler

     1: public class WebFormRouteHandler : IRouteHandler {

2: public WebFormRouteHandler(string virtualPath) 3: : this(virtualPath, true) { 4: } 5:  6: public WebFormRouteHandler(string virtualPath, bool checkPhysicalUrlAccess) { 7: if (virtualPath == null) { 8: throw new ArgumentNullException("virtualPath"); 9: } 10:  11: if (!virtualPath.StartsWith("~/")) { 12: throw new ArgumentException("virtualPath must start with a tilde slash: \"~/\"", "virtualPath"); 13: } 14:  15: this.VirtualPath = virtualPath; 16: this.CheckPhysicalUrlAccess = checkPhysicalUrlAccess; 17: } 18:  19: /// <summary> 20: /// This is the full virtual path (using tilde syntax) to the WebForm page. 21: /// </summary> 22: /// <remarks> 23: /// Needs to be thread safe so this is .ly settable via ctor. 24: /// </remarks> 25: public string VirtualPath { get; private set; } 26:  27: /// <summary> 28: /// Because we're not actually rewriting the URL, ASP.NET's URL Auth will apply 29: /// to the incoming request URL and not the URL of the physical WebForm page. 30: /// Setting this to true (default) will apply URL access rules against the 31: /// physical file. 32: /// </summary> 33: /// <value>True by default</value> 34: public bool CheckPhysicalUrlAccess { get; set; } 35:  36: public IHttpHandler GetHttpHandler(RequestContext requestContext) { 37: string virtualPath = GetSubstitutedVirtualPath(requestContext); 38: if (this.CheckPhysicalUrlAccess && !UrlAuthorizationModule.CheckUrlAccessForPrincipal(virtualPath, requestContext.HttpContext.User, requestContext.HttpContext.Request.HttpMethod)) 39: throw new SecurityException(); 40:  41: var page = BuildManager.CreateInstanceFromVirtualPath(virtualPath, typeof(Page)) as IHttpHandler; 42: if (page != null) { 43: //Pages that don't implement IRoutablePage won't have the RequestContext 44: //available to them. Can't generate outgoing routing URLs without that context. 45: var routablePage = page as IRoutablePage; 46: if (routablePage != null) 47: routablePage.RequestContext = requestContext; 48: } 49: return page; 50: } 51:  52: /// <summary> 53: /// Gets the virtual path to the resource after applying substitutions based . route data. 54: /// </summary> 55: /// <param name="requestContext"></param> 56: /// <returns></returns> 57: public string GetSubstitutedVirtualPath(RequestContext requestContext) { 58: if (!VirtualPath.Contains("{")) 59: return VirtualPath; 60:  61: //Trim off ~/ 62: string virtualPath = VirtualPath.Substring(2); 63:  64: Route route = new Route(virtualPath, this); 65: VirtualPathData vpd = route.GetVirtualPath(requestContext, requestContext.RouteData.Values); 66: if (vpd == null) 67: return VirtualPath; 68: return "~/" + vpd.VirtualPath; 69: } 70: }

2、使用自定义的 IRouteHandler注册一个新的Routes

1: public class Global : System.Web.HttpApplication 2: { 3:  4: protected void Application_Start(object sender, EventArgs e) 5: { 6: RegisterRoutes(RouteTable.Routes); 7: } 8:  9: public static void RegisterRoutes(RouteCollection routes) 10: { 11: //We are intentionally creating this backdoor as a demonstration of 12: //bad security practices. 13: routes.MapWebFormRoute("Secret", "BackDoor", "~/Admin/SecretPage.aspx", false); 14: routes.MapWebFormRoute("Blocked", "FrontDoor", "~/Admin/SecretPage.aspx", true); 15:  16: //Even though we are not checking physical url access in this route, it should still block because the incoming 17: //request url would start with /Admin. 18: routes.MapWebFormRoute("Admin", "Admin/{*anything}", "~/Admin/SecretPage.aspx", false); 19:  20: routes.MapWebFormRoute("Named", "foo/bar", "~/forms/blech.aspx"); 21: routes.MapWebFormRoute("Numbers", "one/two/three", "~/forms/haha.aspx"); 22: 23: //Maps any requests for /haha/*.aspx to /forms/hahah.aspx 24: routes.MapWebFormRoute("Substitution", "haha/{filename}", "~/forms/haha.aspx"); 25: } 26: }