Asp.Net HttpApplication请求管道与Session（一）

1.请求处理顺序执行事件

        /********************请求处理顺序执行事件**********************/
        /// <summary>
        /// 请求入站
        /// 在此管道中禁止访问Session
        /// </summary>
        protected void Application_BeginRequest()
        {
            Response.Write("----BeginRequest---");
            Response.Write("<br/>");
        }
        /// <summary>
        /// 发送内容到客户端之前
        /// 此管道中禁止访问Session
        /// </summary>
        protected void Application_PreSendRequestContent()
        {
            Response.Write("----PreSendContent---:");
            Response.Write("<br/>");
        }
        /// <summary>
        /// 页面框架执行
        /// 此管道中可以访问Session
        /// </summary>
        protected void Application_PostRequestHandlerExecute()
        {
            Response.Write("----PostRequestHandlerExecute---count:" + Session.Count + ",当前SessionID:" + Session.SessionID);
            StringBuilder builder = new StringBuilder();
            Response.Write("<div style='text-indent:2em;'>");
            foreach (string item in Session.Keys)
            {
                string line = string.Format("---{0}:{1}", item, Session[item]);
                builder.AppendLine(line);
            }
            Response.Write(builder.ToString());
            Response.Write("</div>");
            Response.Write("<br/>");
        }
        /// <summary>
        /// 页面框架释放请求状态
        /// 此管道中禁止访问Session
        /// </summary>
        protected void Application_ReleaseRequestState()
        {
            Response.Write("----ReleaseRequestStatet---");
            Response.Write("<br/>");
        }
        /// <summary>
        /// 页面框架响应完成
        ///此管道，禁止使用Session
        /// </summary>
        protected void Application_UpdateRequestCache()
        {
            Response.Write("----UpdateRequestCache---");
            Response.Write("<br/>");
        }
        /// <summary>
        /// 请求出站
        /// 此管道中禁止访问Session
        /// </summary>
        protected void Application_EndRequest()
        {
            Response.Write("----EndRequest---");
            Response.Write("<br/>");
        }