Devexpress GridControl中combobox级联显示

1、combobox控件的创建，我是在CustomRowCellEditForEditing这个事件下处理的。（因为我所需要显示co罪焐芡拂mbobox的列是动态创建的，所以需要这样创建，如果你是固定显示，直接绑定combobox点击事件就可以了。）在这个事件里面，还可以控制某一列不同行显示不同控件。（因为Devexpress是只能设置某一列控件的属性的，不能精准到控制每个单元格中的控件） private void gvwFetchData_CustomRowCellEditForEditing(object sender, DevExpress.XtraGrid.Views.Grid.CustomRowCellEditEventArgs e) { DevExpress.XtraGrid.Views.Grid.GridView view = sender as DevExpress.XtraGrid.Views.Grid.GridView; RepositoryItemComboBox cbx = new DevExpress.XtraEditors.Repository.RepositoryItemComboBox(); switch (e.Column.FieldName) { //case "DBConstructionID": //cbx.Items.Clear(); // cbx.Items.AddRange(cbxConstructions.Select(c => new Models.ComboBoxItemTextValue<int>(c.FieldID, c.FieldName)).ToList()); // cbx.SelectedValueChanged += new EventHandler(cbx_SelectedValueChanged); // //e.RepositoryItem = cbx; // gclDataOperate.RepositoryItems.Add(cbx); // gvwFetchData.Columns["ConstructionName"].ColumnEdit = cbx; //break; case "BuildingName": //获取该行楼盘id string constructid = gvwFetchData.GetRowCellValue(e.RowHandle, "DBConstructionID").ToString(); //楼栋 //根据楼盘查询楼栋的数据 IList<BLL.RealDataWeb.ComboBoxField> cbxBuildings = matchData.GetBuilding(iCityID, Convert.ToInt32(constructid)); //给该行楼栋combobox绑定数据源 cbx.Items.Clear(); cbx.Items.AddRange(cbxBuildings.Select(b => new Models.ComboBoxItemTextValue<int>(b.FieldID, b.FieldName)).ToList()); //combobox值改变后触发 cbx.SelectedValueChanged += new EventHandler(cbx_SelectedValueChanged); //下拉框选中值后，需要进行转换 cbx.ParseEditValue += new ConvertEditValueEventHandler(cbx_ParseEditValue); //指定该列控件 e.RepositoryItem = cbx; break; case "HouseName": string BuindId = gvwFetchData.GetRowCellValue(e.RowHandle, "DBBuildingID").ToString(); //房号 IList<BLL.RealDataWeb.ComboBoxField> House = matchData.GetHouse(iCityID, Convert.ToInt32(BuindId)); cbx.Items.Clear(); cbx.Items.AddRange(House.Select(h => new Models.ComboBoxItemTextValue<int>(h.FieldID, h.FieldName)).ToList()); cbx.SelectedValueChanged += new EventHandler(cbx_SelectedValueChanged); cbx.ParseEditValue += new ConvertEditValueEventHandler(cbx_ParseEditValue); e.RepositoryItem = cbx; break; default: break; } }

2、选择combobox的值时进行的处理。（例如选择楼盘后，将楼盘id存放在一隐藏列中，在点击楼栋时，获取该id，查询所需要的数据源，进行绑定） private void cbx_SelectedValueChanged(object sender, EventArgs e) { BaseEdit edit = gvwFetchData.ActiveEditor; //下拉框数据更改之后，改变级联下拉框数据 switch (gvwFetchData.FocusedColumn.FieldName) { //case "ConstructionName"://楼盘 // gvwFetchData.SetFocusedRowCellValue(gvwFetchData.Columns["DBConstructionID"], ((ComboBoxItemTextValue<int>)edit.EditValue).SelectValue); // gvwFetchData.SetFocusedRowCellValue(gvwFetchData.Columns["BuildingName"], "选择楼栋"); // gvwFetchData.SetFocusedRowCellValue(gvwFetchData.Columns["DBBuildingID"], 0); // gvwFetchData.SetFocusedRowCellValue(gvwFetchData.Columns["HouseName"], "选择房屋"); // gvwFetchData.SetFocusedRowCellValue(gvwFetchData.Columns["DBHouseID"], 0); // break; case "BuildingName"://楼栋 gvwFetchData.SetFocusedRowCellValue(gvwFetchData.Columns["DBBuildingID"], ((ComboBoxItemTextValue<int>)edit.EditValue).SelectValue); gvwFetchData.SetFocusedRowCellValue(gvwFetchData.Columns["DBHouseName"], "选择房屋"); gvwFetchData.SetFocusedRowCellValue(gvwFetchData.Columns["DBHouseID"], 0); break; case "HouseName"://房号 gvwFetchData.SetFocusedRowCellValue(gvwFetchData.Columns["DBHouseID"], ((ComboBoxItemTextValue<int>)edit.EditValue).SelectValue); break;｝

3、 //grid中的下拉框必须要处理一下，不然会报（对象必须实现iconvertible）错误 private void cbx_ParseEditValue(object sender, ConvertEditValueEventArgs e) { e.Value = e.Value.ToString(); e.Handled = true; }