private void cmbJia_SelectedIndexChanged(object sender, EventArgs e) { if (initFlag) { if (string.Empty.Equals(cmbJia.SelectedValue)) { cmbLie.DataSource = initCC(); cmbLie.Enabled = false; } else { DataTable dt = bll.GetByPreId(cmbJia.SelectedValue.ToString()); DataRow dr = dt.NewRow(); dr["id"] = ""; dr["name"] = "所有"; dt.Rows.InsertAt(dr, 0); cmbLie.DataSource = dt; cmbLie.Enabled = true; } cmbLie.DisplayMember = "name"; cmbLie.ValueMember = "id"; cmbLie.SelectedIndex = 0; } // setPlaceData(); }