HttpModule的一些初步认识

　　新建一个类 ValidaterHttpModuleEvents继承管道接口 IHttpModule，代码如下

public class ValidaterHttpModuleEvents:IHttpModule
    {
        public void Dispose()
        {
            
        }

        public void Init(HttpApplication context)
        {
            context.BeginRequest += new EventHandler(context_BeginRequest);
            context.EndRequest += new EventHandler(context_EndRequest);
            context.AuthorizeRequest += new EventHandler(context_AuthorizeRequest);
            context.AcquireRequestState += new EventHandler(context_AcquireRequestState);
            context.AuthenticateRequest += new EventHandler(context_AuthenticateRequest);
            context.PreRequestHandlerExecute += new EventHandler(context_PreRequestHandlerExecute);
            context.PostRequestHandlerExecute += new EventHandler(context_PostRequestHandlerExecute);
            context.ReleaseRequestState += new EventHandler(context_ReleaseRequestState);
            context.UpdateRequestCache += new EventHandler(context_UpdateRequestCache);
            context.ResolveRequestCache += new EventHandler(context_ResolveRequestCache);
            context.PreSendRequestHeaders += new EventHandler(context_PreSendRequestHeaders);
            context.PreSendRequestContent += new EventHandler(context_PreSendRequestContent);
        }
       
        //1
        void context_BeginRequest(object sender, EventArgs e)
        {
            HttpApplication application = (HttpApplication)sender;
            application.Context.Response.Write("请求处理开始<br>");
        }

        //2
        void context_AuthenticateRequest(object sender, EventArgs e)
        {
            HttpApplication application = (HttpApplication)sender;
            application.Context.Response.Write("封装请求身份验证<br>");
        }

        //3
        void context_AuthorizeRequest(object sender, EventArgs e)
        {
            HttpApplication application = (HttpApplication)sender;
            application.Context.Response.Write("封装检查是否能利用以前缓存的输出页面处理请求的过程<br>");
        }

        //4 
        void context_ResolveRequestCache(object sender, EventArgs e)
        {
            HttpApplication application = (HttpApplication)sender;
            application.Context.Response.Write("从缓存中得到数据<br>");
        }
        //5加载初始化Session
        void context_AcquireRequestState(object sender, EventArgs e)
        {
            HttpApplication application = (HttpApplication)sender;
            application.Context.Response.Write("封装坚持是否能利用以前缓存的输出页面处理请求<br>");
        }
        //6
        void context_PreRequestHandlerExecute(object sender, EventArgs e)
        {
            HttpApplication application = (HttpApplication)sender;
            application.Context.Response.Write("Http请求进入HttpHandler之前触发<br>");
        }

        //7
        void context_PostRequestHandlerExecute(object sender, EventArgs e)
        {
            HttpApplication application = (HttpApplication)sender;
            application.Context.Response.Write("在Http请求进入HttpHandler之后触发<br>");
        }


        //8
        void context_ReleaseRequestState(object sender, EventArgs e)
        {
            HttpApplication application = (HttpApplication)sender;
            application.Context.Response.Write("存储Session状态时触发<br>");
        }

        //9
        void context_UpdateRequestCache(object sender, EventArgs e)
        {
            HttpApplication application = (HttpApplication)sender;
            application.Context.Response.Write("更新缓存信息时触发<br>");
        }

        //10
        void context_EndRequest(object sender, EventArgs e)
        {
            HttpApplication application = (HttpApplication)sender;
            application.Context.Response.Write("Http请求处理完成<br>");
        }

        //11
        void context_PreSendRequestHeaders(object sender, EventArgs e)
        {
            HttpApplication application = (HttpApplication)sender;
            application.Context.Response.Write("在向客户端发送Header之前触发<br>");
        }


        //12
        void context_PreSendRequestContent(object sender, EventArgs e)
        {
            HttpApplication application = (HttpApplication)sender;
            application.Context.Response.Write("在向客户端发送内容之前触发<br>");
        }

　　新建一个aspx页面，在Page_Load事件写上

　　 Response.Write("<br/><br/>来自Default.aspx页面<br/>");

　　最后，在配置文件中加上如下代码

　　<httpModules>
　　　　<add name="MyHttpModule" type="HttpModuleTest.ValidaterHttpModuleEvents,HttpModuleTest"/>
　　</httpModules>

　　type中的“HttpModuleTest”表示最基本的命名空间，ValidaterHttpModuleEvents表示自己的HttpModule名称。

　　运行结果如下图所示