Devexpress:在GridControl中使用RepositoryItemGridLookUpEdit 进行级联选择

上一篇点击打开链接中描述了如何在GridControl中增加一个GridLookUpEdit列，这篇文章将要描述如何在它单元格数据之间进行级联选择。

为GridControl增加一个颜色列，根据不同尺寸的大小来切换选择不同的颜色。效果图如下：

为TestModel类增加ColorId属性:

 public int ColorId { get; set; }

定义名为ColorClass的类：

 public class ColorClass    {        public int Id { get; set; }        public string ColorName { get; set; }    }

定义2个返回IEnumeable<ColorClass> 集合的方法：

        /// <summary>        /// 小号对应的可选颜色        /// </summary>        public static IEnumerable<ColorClass> GenerateColorList1()        {            yield return new ColorClass() { Id = 1, ColorName = "红色" };            yield return new ColorClass() { Id = 2, ColorName = "蓝色" };        }        /// <summary>        /// 中号，大号对应的可选颜色        /// </summary>        public static IEnumerable<ColorClass> GenerateColorList2()        {            yield return new ColorClass() { Id = 3, ColorName = "白色" };            yield return new ColorClass() { Id = 4, ColorName = "黑色" };        }



再增加一个表示颜色的GridColumn：
this.gv.Columns.Add(gcSizeType);            // 尺寸选择改变，清空gcColorType列显示            riglup.EditValueChanged += (m, n) =>            {                this.gv.SetFocusedRowCellValue("ColorId", 0);            };            // 颜色类型  GridLookUpEdit            RepositoryItemGridLookUpEdit riglupcolor1 = new RepositoryItemGridLookUpEdit();            riglupcolor1.DisplayMember = "ColorName";            riglupcolor1.ValueMember = "Id";            RepositoryItemGridLookUpEdit riglupcolor2 = new RepositoryItemGridLookUpEdit();            riglupcolor2.DisplayMember = "ColorName";            riglupcolor2.ValueMember = "Id";            // 为riglupcolor1/riglupcolor2 增加2列            GridColumn riglupcolor1Id = riglupcolor1.View.Columns.AddField("Id");            riglupcolor1Id.Caption = "编号";            riglupcolor1Id.VisibleIndex = 0;            riglupcolor1Id.Width = 30;            GridColumn riglupcolor1Name = riglupcolor1.View.Columns.AddField("ColorName");            riglupcolor1Name.Caption = "名称";            riglupcolor1Name.VisibleIndex = 1;            riglupcolor1Name.Width = 30;            GridColumn riglupcolor2Id = riglupcolor2.View.Columns.AddField("Id");            riglupcolor2Id.Caption = "编号";            riglupcolor2Id.VisibleIndex = 0;            riglupcolor2Id.Width = 30;            GridColumn riglupcolor2Name = riglupcolor2.View.Columns.AddField("ColorName");            riglupcolor2Name.Caption = "名称";            riglupcolor2Name.VisibleIndex = 1;            riglupcolor2Name.Width = 30;            // 添加到riglupcolor1/riglupcolor2的Columns集合            riglupcolor1.View.Columns.Add(riglupcolor1Id);            riglupcolor1.View.Columns.Add(riglupcolor1Name);            riglupcolor2.View.Columns.Add(riglupcolor2Id);            riglupcolor2.View.Columns.Add(riglupcolor2Name);            //定义颜色列            GridColumn gcColorType = gv.Columns.AddField("ColorId");            gcColorType.Caption = "颜色";            gcColorType.VisibleIndex = 3;            gv.Columns.Add(gcColorType);            // 自定义单元格编辑事件            gv.CustomRowCellEdit += (s, e1) =>            {                if (e1.Column.FieldName == "ColorId" && e1.RowHandle >= 0)                {                    // 获取尺寸类型                    string sizeTypeId = gv.GetRowCellValue(e1.RowHandle, "SizeTypeId").ToString();                    RepositoryItemGridLookUpEdit riglu = gcSizeType.ColumnEdit as RepositoryItemGridLookUpEdit;                    DataRow dr = (riglu.DataSource as DataTable).Select($" Id = {sizeTypeId}").SingleOrDefault();                    string name = dr?["Name"].ToString();                    // 根据尺寸类型显示不同的颜色                    if (name == "小号")                    {                        riglupcolor1.DataSource = DataHelper.GenerateColorList1().ToList();                        e1.RepositoryItem = riglupcolor1;                    }                    else                    {                        riglupcolor2.DataSource = DataHelper.GenerateColorList2().ToList();                        e1.RepositoryItem = riglupcolor2;                    }                }            };            this.gc.DataSource = list;

代码中的DataHelper类为一个包含GenerateColorList1与GenerateColorList2方法的静态类。
总结：掌握常用的几种RepositoryItem类型的用法，这种级联效果很容易能做的出来，不过需要花费大量的时间去官网上查询。