Devexpress GridControl下拉框实现联动

实现效果

1.先在设计界面绑定数据列

1.点击设计器

2.绑定数据列

2. 绑定GridView的 FocusedRowChanged事件

  //定义两个下拉框  _RIcmbtype：不良分类  _RIcmbdefect：不良信息
  RepositoryItemComboBox _RIcmbtype = new RepositoryItemComboBox();
  //设置下拉框的字体样式
  _RIcmbtype.AppearanceDropDown.Font = new Font("Tahoma", 11);
  _RIcmbtype.AppearanceDropDown.Options.UseFont = true; 
  RepositoryItemComboBox _RIcmbdefect = new RepositoryItemComboBox();

 private void gvmain_FocusedRowChanged(object sender, DevExpress.XtraGrid.Views.Base.FocusedRowChangedEventArgs e)
        {
            if (gvmain.FocusedRowHandle >= 0)
            {  
                _RIcmbtype.Items.Clear();

                if (typeInfos.Count > 1)
                {
                    foreach (var key in typeInfos)
                    {
                        _RIcmbtype.Items.Add(new ComboBoxItem(key.bug_typename));
                    }
                }

                gvmain.Columns.ColumnByName("colbug_typename").ColumnEdit = _RIcmbtype;

                // 为第一列的下拉框添加EditValueChanged事件处理程序  
                _RIcmbtype.EditValueChanged += _RIcmbtype_EditValueChanged;
                _RIcmbdefect.EditValueChanged += _RIcmbdefect_EditValueChanged;
            }
        }

3. 绑定下拉框的EditValueChanged事件

        private void _RIcmbtype_EditValueChanged(object sender, EventArgs e)
        {
            // 获取当前行的索引  
            int rowIndex = gvmain.FocusedRowHandle;
            if (rowIndex >= 0)
            {
                var s = (DevExpress.XtraEditors.ComboBoxEdit)sender;

                // 获取当前选中的值  
                string selectedValue = s.EditValue.ToString();

                // gvmain.GetRowCellValue(rowIndex, "列名")  这种方法是获取不到选中的值的，原因是选择了,但是实际还未渲染到数据上去就触发了这个事件;

                //获取被选中的类型并给所在行赋值 PS：下面4行代码为业务代码 不用看
                var type = typeInfos.First(a => a.bug_typename == selectedValue);
                dataInfo[rowIndex].bug_typeid = type.bug_id;
                dataInfo[rowIndex].bug_typecode = type.bug_typecode;
                dataInfo[rowIndex].bug_typename = type.bug_typename;
                //通过选择的下拉框的值来获取第二个下拉框的数据
                var list = defectInfos.Where(a => a.bug_typename == selectedValue).ToList();
                _RIcmbdefect.Items.Clear();
                foreach (var key in list)
                {
                    _RIcmbdefect.Items.Add(new ComboBoxItem(key.bug_describe));
                }
                //设置列的ColumnEdit 为下拉框
                gvmain.Columns.ColumnByName("colbug_describe").ColumnEdit = _RIcmbdefect;

                // 刷新第二列以显示新的下拉选项  
                gvmain.InvalidateRow(rowIndex);
            }
        }