缓存引起的session问题(ajax,js,jquery,asp.net,C#)

AsyncData.ashx文件

public void ProcessRequest (HttpContext context) {        string action = context.Request.QueryString["action"];//getcity,getstore        string arg = context.Request.QueryString["arg"];// areaGUID,        string pwd = context.Request.QueryString["pwd"];//user login password        StringBuilder strResult = new StringBuilder();                if (action == "userLogin")        {            Model.BJ_UserInfo userModel = new Model.BJ_UserInfo();            BLL.BJ_User userBll = new BLL.BJ_User();            UserInfo ui = new UserInfo();                        if (string.IsNullOrEmpty(arg) || string.IsNullOrEmpty(pwd))                return;            else                userModel = userBll.GetModel(arg, WebUtility.GetMD5(pwd));            if (userModel != null)            {                ui.UserGUID = userModel.UserGUID.ToString();                ui.UserName = userModel.UserName;                ui.RealName = userModel.RealName;                ui.SecurityGUID = userModel.SecurityGUID.ToString();                //ui.IP = WebUtility.GetIpAddress;                //ui.StoreName = IpLocation(ui.IP);                context.Session["userinfo"] = ui;                strResult.Append(ui.UserName);            }            else                strResult.AppendFormat("0");        }       }

 

CheckLogin.js文件

//---------------------javascript-------------------------------jQuery(function($){        $("#btnLogin").click(function(){                 var target1 = $("#txtUserName");        var target2 = $("#txtPwd");            if(target1.val()=='')        {            alert('用户名不能为空！');            return;        }        if(target2.val()=='')        {            alert('密码不能为空！');            return;        }        else                        funAjaxText("userLogin", target1.val(), target2.val());                });        var funAjaxText = function(action, username,pwd){        $.ajax({            type: "GET",            url: "../Controls/AsyncData.ashx?action="+ action +"&arg="+username+"&pwd="+pwd,            beforeSend: function(data){            },            success: function(data){                                 if(data=="0")                    {                        $("#txtPwd").val("");                        alert("用户名或密码有误！");                                            }                    else                    {                                                window.location.href="MyBJ/MyBJ.aspx";                    }                                                }                    });    };    });

首页用户登录，进行退出时，清空当前会话

Session.Clear();        Session.Abandon();        Response.Redirect("index.aspx");

并跳转到前页（刷新）,

再次登录时，登录成功，跳转到mybj.aspx页面

page_load()

{

UserInfo userModel = new UserInfo();        userModel = (UserInfo)Session["userinfo"];        if (userModel == null)        {            WebUtility.ShowMessageAndRedirect("你还没有登录！","../index.aspx", this.Page);                    }

}

会出现，session["userinfo"]为空的情况。

这里的问题是缓存，

解决方法是在进行异步数据请求时，加多一个随机数，以使此请求不同于前，于是才不会去读取缓存。

url: "../Controls/AsyncData.ashx?action="+ action +"&arg="+username+"&pwd="+pwd+"&update="+Math.random(),