下面是類的定義。
代碼如下:
using System;
 using System.Web;
 using System.Web.SessionState;

 namespace QTJZ
 {
     public class Filters : IHttpModule, IRequiresSessionState
     {
         public void Dispose() { }

         public void Init(HttpApplication application)
         {
             application.AcquireRequestState += new EventHandler(application_AcquireRequestState);
         }

         public void application_AcquireRequestState(object sender, EventArgs e)
         {
             HttpApplication application = sender as HttpApplication;
             HttpRequest request = application.Request;
             HttpResponse response = application.Response;

             string url=request.CurrentExecutionFilePath.Trim('/');
             string suffix = request.CurrentExecutionFilePathExtension.Trim('.');

             if (!url.Equals("Default.htm") && (suffix == "aspx" || suffix == "htm"))
             {
                 object sessionObj = application.Context.Session == null ? null : application.Session["useID"];
                 if (sessionObj==null)
                 {
                     response.Redirect("~/Default.htm");
                 }
             }
         }
     }
 }

為了實現過濾的效果，Filters類需要實現IHttpMoeld接口，實現該接口需要有兩個方法，一個是Dispose,另一個是Init。Init的參數是一個HttpApplication類型的實例，利用這個實例注冊一些事件。由于現在要對URL進行過濾，因此注冊的是AcquireRequestState事件。類似事件羅列如下

發表評論 共有條評論 用戶名: 密碼: 驗證碼: 匿名發表