Cookies 异常

Question

protected void Page_Load(object sender, EventArgs e)
    {
       
            if (!IsPostBack)
            {                if (Request.Cookies["u1000JM"]["username"] == "")
                {
                    Panel1.Visible = true;
                    Panel2.Visible = false;
                }
                else
                {
                    Panel1.Visible = false;
                    Panel2.Visible = true;
                    dlusername.Text = Request.Cookies["u1000JM"]["username"];
                    jfgl.Text = Request.Cookies["u1000JM"]["zjf"];
                    lxr.Text = Request.Cookies["u1000JM"]["lxr"];
                    dlsj.Text = Request.Cookies["u1000JM"]["dlsj"];
                }
                //password.Value = Request.Cookies["u1000JM"]["password"];
            }
            if (Request.Cookies["u1000JM"]["Checkbox"] == "1")
            {
                //记录密码
                Panel1.Visible = false;
                Panel2.Visible = true;
                //相应赋值
                dlusername.Text = Request.Cookies["u1000JM"]["username"];
                jfgl.Text = Request.Cookies["u1000JM"]["zjf"];
                lxr.Text = Request.Cookies["u1000JM"]["lxr"];
                dlsj.Text = Request.Cookies["u1000JM"]["dlsj"];
            }
    }
运行 Request.Cookies["u1000JM"]["username"] == "" 就出现以下错误
“((System.Web.UI.UserControl)(this)).Request”引发了“System.NullReferenceException”类型的异常

Answer 1

为null值？先加个判断
if(Request.Cookies["u1000JM"]["username"]!=null)
{
//...
}