关于"未将对象引用设置到对象的实例"的问题

Question

    后台:protected void btnDiaoAll_Click(object sender, EventArgs e)
        {
            string id = hf.Value;
            string oper = Request.Cookies["ckuser"].ToString();//就这里出错            if (BaojianAspNet.BLL.MaterialAssignBLL.ExecuteNonQuery(id, DateTime.Now.ToLocalTime(),oper) >= 0)
                ClientScript.RegisterStartupScript(this.GetType(), "", "alert('调派成功!');", true);
            else
                ClientScript.RegisterStartupScript(this.GetType(), "", "alert('调派失败!');", true);           
        }    底层DAL:public static int ExecuteNonQuery(string id, DateTime time, string oper)
        {
            string sql = "update MaterialAssign set State = '1',FinishDat= @date,oper=@oper where pk in(" + id + ")";
            SqlParameter[] para ={ 
                new SqlParameter("@date", time), 
                new SqlParameter("@oper", oper) 
            };
            return SqlHelper.ExecuteNonQuery("", CommandType.Text, sql, para);
        }
    不知道为什么错了~~~~

Answer 1

if (!string.IsNullOrEmpty(Request.Cookies["ckuser"]))
            {
                string oper = Request.Cookies["ckuser"].ToString();
            }

Answer 2

顺便检查下你给Cookies["ckuser"]赋值时有没有得到数据!

Answer 3

if (!string.IsNullOrEmpty(Request.Cookies["ckuser"]))
            {
                string oper = Request.Cookies["ckuser"].ToString();
            }
先判断 coolies是否存在，不然request对象去哪找这个ckuser这个参数呢

Answer 4

很明显
你的cookie值就没有获取到啊。 if (Request.Cookies["ckuser"] != null)
            {
string oper = Request.Cookies["ckuser"].ToString();}

Answer 5

   是不是出错是因为没有找到COOKIES的值呢?