webform是怎么通過url找到對應handler的呢?

mvc 和webapi的路由都是通過注冊到RouteTable.Routes中,然后在urlroutingmodule中路由到對應routehander,那以前webform程序沒有注冊路由又是怎么找到對應的handler的呢?

在httpapplication中注冊事件中有一個MapHandlerExecutionStep

internal override void BuildSteps(WaitCallback stepCallback){.......arrayList.Add(new HttpApplication.MapHandlerExecutionStep(application));......}

在這個事件中

void HttpApplication.IExecutionStep.Execute(){........context.Handler = this._application.MapHttpHandler(context, request.RequestType, request.FilePathObject, request.PhysicalPathInternal, false);......} // System.Web.HttpApplication internal IHttpHandler MapHttpHandler(HttpContext context, string requestType, VirtualPath path, string pathTranslated, bool useAppConfig) {IHttpHandler httpHandler = (context.ServerExecuteDepth == 0) ? context.RemapHandlerInstance : null;using (new ApplicationImpersonationContext()){if (httpHandler != null){return httpHandler;}HttpHandlerAction handlerMapping = this.GetHandlerMapping(context, requestType, path, useAppConfig);........
　　　　　　//根據請求信息包裝對應工廠類并放入緩存中,每次從緩存中獲取IHttpHandlerFactory factory = this.GetFactory(handlerMapping);try{
　　　　　　　　//獲取handlerIHttpHandlerFactory2 httpHandlerFactory = factory as IHttpHandlerFactory2;if (httpHandlerFactory != null){httpHandler = httpHandlerFactory.GetHandler(context, requestType, path, pathTranslated);}else{httpHandler = factory.GetHandler(context, requestType, path.VirtualPathString, pathTranslated);}}.........}return httpHandler; }

所以每次webform或者handler請求后都會從緩存中獲取工廠類然后獲取對應的handler

如何實現webform友好訪問呢?

現在webform新建程序都會自動添加像mvc路由一樣的路由注冊文件

public class Global : HttpApplication{void Application_Start(object sender, EventArgs e){// 在應用程序啟動時運行的代碼 RouteConfig.RegisterRoutes(RouteTable.Routes);BundleConfig.RegisterBundles(BundleTable.Bundles);}}

public static class RouteConfig{public static void RegisterRoutes(RouteCollection routes){var settings = new FriendlyUrlSettings();settings.AutoRedirectMode = RedirectMode.Permanent;routes.EnableFriendlyUrls(settings);}}

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轉載于:https://www.cnblogs.com/NNYang/p/11006394.html

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