如何确定asp.net请求生命周期的当前处理事件

using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Web.Security;using System.Web.SessionState;namespace Events{ ???public class Global : System.Web.HttpApplication ???{ ???????public Global() ???????{ ???????????BeginRequest += HandleEvent; ???????????EndRequest += HandleEvent; ???????????AcquireRequestState += HandleEvent; ???????????PostAcquireRequestState += HandleEvent; ???????} ???????private void HandleEvent(object sender, EventArgs e) ???????{ ???????????//httpContext类用于访问所有有关应用程序，所处理的请求以及正在构建的请求的信息，并且它的属性currentNotification定义了HttpApplication
事件的子集 ???????????string eventName = "<Unknown>"; ???????????switch (Context.CurrentNotification) ???????????{ ???????????????case RequestNotification.BeginRequest: ???????????????case RequestNotification.EndRequest: ???????????????????eventName = Context.CurrentNotification.ToString(); ???????????????????break; ???????????????case RequestNotification.AuthenticateRequest: ???????????????????break; ???????????????case RequestNotification.AuthorizeRequest: ???????????????????break; ???????????????case RequestNotification.ResolveRequestCache: ???????????????????break; ???????????????case RequestNotification.MapRequestHandler: ???????????????????break; ???????????????????//当asp.net fromework需要与请求关联的状态时，将触发改事件 ???????????????case RequestNotification.AcquireRequestState: ???????????????????if (Context.IsPostNotification) ???????????????????{ ???????????????????????eventName = "PostAcquireRequestState"; ???????????????????} ???????????????????else ???????????????????{ ???????????????????????eventName = "AcquireRequestState"; ???????????????????} ???????????????????break; ???????????????case RequestNotification.PreExecuteRequestHandler: ???????????????????break; ???????????????case RequestNotification.ExecuteRequestHandler: ???????????????????break; ???????????????case RequestNotification.ReleaseRequestState: ???????????????????break; ???????????????case RequestNotification.UpdateRequestCache: ???????????????????break; ???????????????case RequestNotification.LogRequest: ???????????????????break; ???????????????case RequestNotification.SendResponse: ???????????????????break; ???????????????default: ???????????????????break; ???????????} ???????????EventCollection.Add(EventSource.Application, eventName); ???????} ???????protected void Application_Start(object sender, EventArgs e) ???????{ ???????????EventCollection.Add(EventSource.Application, "Start"); ???????????Application["message"] = "Aplication Events"; ???????} ???????protected void Session_Start(object sender, EventArgs e) ???????{ ???????} ???????protected void Application_BeginRequest(object sender, EventArgs e) ???????{ ???????????//收到请求时触发的第一个事件 ???????????EventCollection.Add(EventSource.Application, "BeginRequest"); ???????????Response.Write(string.Format("request started at {0}", DateTime.Now.ToLongTimeString())); ???????} ???????protected void Application_EndRequest(object sender,EventArgs e) ???????{ ???????????EventCollection.Add(EventSource.Application, "EndRequest"); ???????} ???????protected void Application_AuthenticateRequest(object sender, EventArgs e) ???????{ ???????} ???????????????protected void Application_Error(object sender, EventArgs e) ???????{ ???????} ???????protected void Session_End(object sender, EventArgs e) ???????{ ???????} ???????protected void Application_End(object sender, EventArgs e) ???????{ ???????????EventCollection.Add(EventSource.Application,"End"); ???????} ????}}