我将数据从ms-access
数据库加载到listbox
.. 我想要做的就是listbox datasource
在单击更新按钮时更新或刷新我的数据。然后这是我用于方法的代码,然后调用DataLoadListBox()
onform_load event
并更新button_click event
..
private BindingList<mylist> myList = new BindingList<mylist>();
private void DataLoadListBox()
{
string query = "select * from myItem order by itemname";
OleDbDataAdapter cmd = new OleDbDataAdapter(query, Conn());
DataSet dt = new DataSet();
cmd.Fill(dt, "myItem");
DataTable datTable = dt.Tables[0];
foreach (DataRow dtRow in datTable.Rows)
{
myList.Add(new mylist() { id = dtRow["ID"].ToString(), itemname = dtRow["itemname"].ToString() });
}
mylb.DisplayMember = "itemname";
mylb.DataSource = myList;
mylb.ValueMember = "id";
Conn().Close();
}
然后当textbox
文本填充了我想要的内容时,我推送了button_click
如下编码的更新事件
OleDbCommand comm = new OleDbCommand("update myItem set itemname = @itemname where ID = @ID", Conn());
comm.Parameters.AddWithValue("@itemname", itemname.Text);
comm.Parameters.AddWithValue("@ID", itemid.Text));
comm.ExecuteNonQuery();
// start updating the listbox
myList.Clear();
mylb.DataSource = null;
mylb.Items.Clear();
mylb.Refresh();
mylb.Update();
mylb.DataSource = myList;
DataLoadListBox();
// none of above working, the listbox datasource not getting update
问题是我没有得到listbox datasource
更新,我在这里做错了什么?我该如何进行这项工作?