关于使用COOKIES未将对象使用到实例的问题
ASPX文件上写了个简单的BUTTON
CS里的代码

C# code

protected void btn_Click(object sender, EventArgs e)           {                Response.Cookies["姓名"].Value = "ri";                Response.Redirect("Manager.aspx");            }

然后manager.aspx页面

C# code

public partial class Manager : System.Web.UI.Page{    protected void Page_Load(object sender, EventArgs e)    {        Response.Write(Request.Cookies["姓名"].Value);        Response.End();    }}

然后点击button后转跳到manager.aspx,直接显示

异常详细信息: System.NullReferenceException: 未将对象引用设置到对象的实例。

源错误:


行 10: protected void Page_Load(object sender, EventArgs e)
行 11: {
行 12: Response.Write(Request.Cookies["姓名"].Value);
行 13: Response.End();
行 14: }


另外,刚刚去复制这个错误时,刷新了一下MANAGER.ASPX,有显示ri(COOKIES),但是再一刷新又错误了...
被这个COOKIES搞死了...
昨晚给COOKIES过期时间Response.Cookies["姓名"].Expires = DateTime.MaxValue;仍然不行.
后来百度了一下,说要判断COOKIES是否为NULL(IF REQUEST.COOKIES["姓名"] != null)这样,也试过了,总之就是压根cookies["姓名"]怎么弄他就是没有值,太纠结了.

[解决办法]

C# code

/* 添加cookie */HttpCookie cookie = new HttpCookie(CookieName);            cookie.Value = HttpUtility.UrlEncode(val);            if(Day > 0)                cookie.Expires = DateTime.Now.AddDays(Day);            HttpContext.Current.Response.Cookies.Add(cookie);/* 判断非空 */(HttpContext.Current.Request.Cookies[cookieName] != null);
[解决办法]
Response.Cookies(“姓名”).Expires
[解决办法]
            string Name = mrm.id.ToString();
           System.Web.HttpCookie cookie1 = new System.Web.HttpCookie("admin");
           cookie1.Expires.AddMinutes(30);
           cookie1.Value = mrm.LoginId;
           Response.AppendCookie(cookie1);
           Response.Redirect("Default.aspx?AHSDS=" + Maticsoft.DBUtility.DESEncrypt.Encrypt(Name) + "");     



       if (Request.Cookies["admin"] == null)
       {
           Response.Write("<script>top.location.href='Login.aspx';</script>");
       }
       else
       {
           lblMA.Text = Request.Cookies["admin"].Value;
       }


你这么用看看