Question

我无法绑定DropDownlist，我的代码是Sqldatareader。我没有得到任何输出。我想从数据库中显示值并绑定它。

try
    {

        SqlDataReader ds = obj.GetDataReader("Select Name, Emp_ID from 
EMP_Info where Emp_ID in (  select Emp_ID from EMP_Info where Name ='" + 
Session["AG_name"].ToString() + "' except select Emp_ID from RosterWeekly 
where  WeekStartDate  between '" + txtDate.Text + "' and '" + 
Convert.ToDateTime(txtDate.Text).AddDays(7).ToShortDateString() + "') Order 
By Name");


           txempid.DataSource = ds;
           txempid.DataValueField = "Emp_ID";
           txempid.DataTextField = "Name";


         txempid.DataBind();

        txempid.Items.Insert(0, new ListItem("--Select Employee Name--", 
"0"));
       txempid.Items.Insert(1, new ListItem(ds[0].ToString(), "1"));


  }
  catch (Exception ex)
 {

 }

// dropdownlist code

<asp:DropDownList  Height="35" Width="200" ID="txempid" runat="server" 
AutoPostBack="true" OnSelectedIndexChanged ="txempid_SelectedIndexChanged" >
</asp:DropDownList>

Answer 1

问题似乎与字符串中的datetime参数有关。我不喜欢直接在查询中传递的txtDate.Text。

我建议你在查询中加入几个参数并将它们作为强类型参数传递（我认为obj是SqlCommand个对象）：

var obj = new SqlCommand("Select Name, Emp_ID from 
EMP_Info where Emp_ID in (  select Emp_ID from EMP_Info where Name ='" + 
Session["AG_name"].ToString() + "' except select Emp_ID from RosterWeekly 
where  WeekStartDate  between @startDate and @endDate) Order 
By Name", conn);

var par1 = new SqlParameter();
par1.DbType = DbType.DateTime;
par1.Value = DateTime.Parse(txtDate.Text);
par1.ParameterName = "@startDate";

var par2 = new SqlParameter();
par2.DbType = DbType.DateTime;
par2.Value = DateTime.Parse(txtDate.Text).AddDays(7);
par2.ParameterName = "@endDate";

obj.Parameters.Add(par1);
obj.Parameters.Add(par2);

SqlDataReader ds = obj.ExecuteReader();

我没有时间在运行时尝试这个，所以也许某些东西需要调整......

我无法绑定下拉列表

1 个答案: