Winform+DevExpress使用GridLookUpEdit实现订单明细选择商品，并自动添加新商品记录

/// <summary>
/// 初始化 RepositoryItemGridLookUpEdit 组件
/// </summary>
private void InitGridLookUpEdit_SelectProduct()
{
    GridView view = rep_SelectProduct.View;

    view.Columns.Clear();
    view.Columns.Add(new GridColumn { Caption = "产品编号", FieldName = nameof(tb_SOs.ProductCode), Width = 100, VisibleIndex = 0 });
    view.Columns.Add(new GridColumn { Caption = "品名", FieldName = nameof(tb_SOs.ProductName), Width = 150, VisibleIndex = 1 });
    view.Columns.Add(new GridColumn { Caption = "规格", FieldName = nameof(tb_SOs.Spec), Width = 150, VisibleIndex = 2 });
    view.Columns.Add(new GridColumn { Caption = "配方", FieldName = nameof(tb_SOs.Formula), Width = 60, VisibleIndex = 3 });
    view.Columns.Add(new GridColumn { Caption = "长度", FieldName = nameof(tb_SOs.Length), Width = 60, VisibleIndex = 4 });
    view.Columns.Add(new GridColumn { Caption = "米重", FieldName = nameof(tb_SOs.UnitWeight), Width = 60, VisibleIndex = 5 });

    var width = view.Columns.ToList().Sum(i => i.Width) + 10;
    rep_SelectProduct.AcceptEditorTextAsNewValue = DevExpress.Utils.DefaultBoolean.True; //重要！！！接受文本框的值作为新值显示
    rep_SelectProduct.NullText = "";
    rep_SelectProduct.PopupFormSize = new Size(width, 400);//下拉窗体尺寸
    rep_SelectProduct.View.RowHeight = 22; //行高
    rep_SelectProduct.ImmediatePopup = true;//输入值立即弹出下拉窗体
    rep_SelectProduct.SearchMode = GridLookUpSearchMode.AutoSearch;//设置为自动搜索模式，重要！！！
    rep_SelectProduct.PopupFilterMode = DevExpress.XtraEditors.PopupFilterMode.Contains;//表格筛选列过滤模式
    rep_SelectProduct.TextEditStyle = DevExpress.XtraEditors.Controls.TextEditStyles.Standard;//允许录入资料
    rep_SelectProduct.View.OptionsView.ShowAutoFilterRow = true;//下拉表格显示过滤行

    //按回车键处理包含关系的新值
    rep_SelectProduct.ProcessNewValue += this.On_GridLookUpEdit_ProcessNewValue; //在输入框录入新值处理事件

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

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

    rep_SelectProduct.CloseUp += On_GridLookUpEdit_CloseUp;

    //绑定数据源
    List<dt_Product> list = DataDictCache.Cache.ProductList.Copy();
    rep_SelectProduct.DisplayMember = nameof(tb_SOs.ProductName);
    rep_SelectProduct.ValueMember = nameof(tb_SOs.ProductName);
    rep_SelectProduct.DataSource = list;
}

/// <summary>
/// 在单元格录入新值，自动添加到数据源
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void On_GridLookUpEdit_ProcessNewValue(object sender, ProcessNewValueEventArgs e)
{
    var editor = sender as GridLookUpEdit;

    if (e.DisplayValue.IsEmpty() || e.DisplayValue.ToStringEx() == editor.Properties.NullText)
    {
        return;
    }

    //如果没有绑定数据源，初始化空列表实例
    if (editor.Properties.DataSource == null)
    {
        editor.Properties.DataSource = new List<dt_Product>();
    }

    //给数据源添加一条记录
    var list = editor.Properties.DataSource as List<dt_Product>;
    list.Add(new dt_Product { ProductName = e.DisplayValue.ToStringEx() });

    e.Handled = true;
}

/// <summary>
/// GridLookUpEdit组件回车键事件，录入的数据不存在，自动添加到数据源
/// </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;
        var list = rep_SelectProduct.DataSource as List<dt_Product>;
        if (!list.Any(a => a.ProductName.ToStringEx().ToLower() == txt.ToLower())) //数据源没有该值
        {
            list.Add(new dt_Product { ProductName = txt });//这里必须是对应DisplayMember字段
        }

        gvDetail.HideEditor();
        gvDetail.SetFocusedRowCellValue(nameof(dt_Product.ProductName), txt);
        e.Handled = true;
    }
}

/// <summary>
/// 选择一条记录，触发表格的点击事件
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void On_GridLookUpEdit_RowClick(object sender, RowClickEventArgs e)
{
    GridView gv = (sender as GridView);
    dt_Product product = gv.GetRow(e.RowHandle) as dt_Product; //下拉窗体当前选择行
    res_SOs row = gvDetail.GetRow<res_SOs>();//明细表当前行
    SetRowProductInfo(row, product);//赋值
    gvDetail.HideEditor();
    e.Handled = true;
}

/// <summary>
/// 给销售订单明细记录设置产品资料
/// </summary>
/// <param name="row"></param>
/// <param name="product"></param>
void SetRowProductInfo(res_SOs row, dt_Product product)
{
    row.ProductCode = product.ProductCode;
    row.ProductName = product.ProductName;
    row.ProductType = product.ProductType;
    row.CategoryId = product.CategoryId;//品类
    row.Price = product.SellPrice;//吨价
    row.Spec = product.Spec;
    row.Unit = product.UnitID;
    row.Formula = product.Formula;
    row.Length = product.Length;
    row.UnitWeight = product.Weight;//米重
}

private void frmSO_Load(object sender, EventArgs e)
{               
    this.InitGridLookUpEdit_SelectProduct();
}