对象引用未设置为我的会话的对象实例 [英] Object reference not set to an instance of an object for my session

问题描述

以下是在会话中加载日期的方法

Below is the method that loads date in a session

protected void getDayOfWeek(int selectedDay)
        {
           if ((int)DateTime.Now.DayOfWeek >= selectedDay || (int)DateTime.Now.DayOfWeek <= selectedDay)
            {
                Session["SelectedDay"] = DateTime.Now.AddDays(-((int)DateTime.Now.DayOfWeek - selectedDay)).ToShortDateString();
            }
        }

现在下面是一个事件，因此我想使用以上会话重新加载gridview，但由于某些我不知道的原因，该会话似乎为空，我收到此错误对象引用未设置为对象的实例. "

Now below is an event, so i want to use the session above to reload a gridview but it appears that the session is empty for some reasons that i dont know , i get this error "Object reference not set to an instance of an object."

protected void ddlEmployeeID_SelectedIndexChanged(object sender, EventArgs e)
        {
                       DataTable dTable = new DataTable();
                       dTable = systemBusinessLayer.GetAllEmployeesInfo();
            foreach (DataRow dRow in dTable.Rows)//Go through each row inside datatable
            {
                string empIDNumber = dRow["Fullname"].ToString();
                if (ddlEmployeeID.SelectedItem.Text == empIDNumber)
                {
                    Session["idnumber"] = dRow["EmpRecNumber"].ToString();
                                  
               }
              
loagrvSlots(Convert.ToInt32(Session["idnumber"]), Session["SelectedDay"].ToString());
            }
           
        
        }

推荐答案

您的条件是否无用:在午夜前后非常短暂的时间内将是不真实的.

您确定问题出在您的Session ["SelectedDay"]吗?你检查了吗因为它可能是Session ["idnumber"] ......

我先检查一下并从那里开始.

Your if condition is useless: it will be untrue for a very, very brief time around midnight.

Are you sure that the problem is your Session["SelectedDay"]? Have you checked? Because it could be Session["idnumber"] instead...

I would start by checking both and work back from there.

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