listbox show System.Data.DataRowView

Question

    String start_cd;
    String end_cd;
    opencon();

    SqlCommand res = new SqlCommand("SELECT ID,'" + start_cd + "','" + end_cd + "' FROM Train_route_up WHERE " + start_cd + "!=0 or " + end_cd + "!=0", con);
    SqlDataAdapter sda_res = new SqlDataAdapter(res);
    DataTable dt_res = new DataTable();
    sda_res.Fill(dt_res);

    listBox1.DataSource=dt_res;
    listBox1.DisplayMember=" +start_cd+ ";
    //Train_route_up=  SQL table name
    //FOT=start_cd value(nvarchar)

listbox show System.Data.DataRowView（mysql table column name = FOR Data type = int）

Answer 1

尝试

listBox1.DisplayMember= start_cd.Trim();

Answer 2

如果start_cd变量包含要显示的列的名称，则将start_cd变量分配给DisplayMember属性，即

listBox1.DisplayMember = start_cd;