C# DevExpress高级篇 - GridLookUpEdit组件使用

 //在输入框录入新值处理事件
 rep_Grid.ProcessNewValue += OnGrid_ProcessNewValue; 

        /// <summary>
        /// 输入新值，若下拉窗体没有匹配数据，自动添加到下拉表格的数据源
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void OnGrid_ProcessNewValue(object sender, DevExpress.XtraEditors.Controls.ProcessNewValueEventArgs e)
        {
            var editor = sender as GridLookUpEdit;

            //处理空值
            if (e.DisplayValue == null || String.IsNullOrWhiteSpace(e.DisplayValue.ToString()) || e.DisplayValue.ToString() == editor.Properties.NullText)
            {
                return;
            }

            //数据源添加一条记录
            var list = editor.Properties.DataSource as List<GoodsItem>;
            list.Add(new GoodsItem { GoodsNo = e.DisplayValue.ToString() });//这里必须是对应DisplayMember字段

            e.Handled = true;
        }

            //按回车键处理包含关系的新值
            rep_Grid.KeyDown += On_GridLookUpEdit_KeyDown;

        /// <summary>
        /// 按回车键保存新录入的内容（自动保存包含关系的内容，如：数据源的字段有ABC值, 录入BC回车，数据源要自动保存BC值）
        /// 注：GridLookUpEdit组件默认不保存新值，如BC值，需要通过KeyDown事件特殊处理！
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void On_GridLookUpEdit_KeyDown(object? sender, KeyEventArgs e)
        {
            if (e.KeyCode == Keys.Enter) //捕获回车键
            {
                var txt = (sender as GridLookUpEdit).Text; //取录入的值，如：BC

                //数据源添加一条记录
                var list = rep_Grid.DataSource as List<GoodsItem>;
                if (!list.Any(a => a.GoodsNo.ToLower() == txt.ToLower())) //数据源没有该值
                {
                    list.Add(new GoodsItem { GoodsNo = txt });//这里必须是对应DisplayMember字段
                }

                //隐藏下拉表格窗体
                gridView1.HideEditor();

                //单元格设置新录入的值，如：BC
                gridView1.SetFocusedRowCellValue(nameof(GoodsItem.GoodsNo), txt);

                //处理按键操作完成
                e.Handled = true;
            }
        }

//下拉表格的记录行点击事件
rep_Grid.View.RowClick += On_GridLookUpEdit_RowClick;

        /// <summary>
        /// 下拉表格窗体选中一行，自动给当前行赋值
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void On_GridLookUpEdit_RowClick(object sender, RowClickEventArgs e)
        {
            //下拉表格(GridLookUpEdit)当前行
            GridView gv = (sender as GridView);
            GoodsItem item = gv.GetRow(e.RowHandle) as GoodsItem;

            //数据表格当前行
            var row = gridView1.GetFocusedRow() as GoodsItem;
            row.ProductName = item.ProductName;
            row.GoodsNo = item.GoodsNo;

            gridView1.UpdateCurrentRow();

            //事件操作完成
            e.Handled = true;
        }

 rep_Grid.CloseUp += On_GridLookUpEdit_CloseUp;

        private void On_GridLookUpEdit_CloseUp(object sender, CloseUpEventArgs e)
        {
            //设置不接受当前焦点行的值。避免关闭下拉窗体时，自动取下拉窗体焦点行的值
            e.AcceptValue = false;
        }