Aspxgridview编辑表格级联下拉

Question

在ASPxGridView中，我有GridViewDataComboBoxColumn，其中在EditForm中。 文本字段和值字段均为字符串。 如果我从第一个下拉列表中选择值，则表示它不在第二个下拉列表中获取值，它将返回null值，我不知道该在哪里更改代码。

我从第一组合框中没有任何价值。 我没有任何错误。

请检查我的代码。

[C#]
 protected void grdMaterialsFlow_CellEditorInitialize(object sender, ASPxGridViewEditorEventArgs e)
        {
 if (e.Column.FieldName == "SKU")
                {
                    DataSet ds = new DataSet();
                    FacilityId = ((DevExpress.Web.ASPxCallbackPanel)this.Page.Master.FindControl("cmpMastePageCallBackPanel")).FindControl("TitleContent").FindControl("cmbFacility") as DevExpress.Web.ASPxComboBox;
                    string val = FacilityId == null ? String.Empty : FacilityId.SelectedItem == null ? String.Empty : Convert.ToString(FacilityId.SelectedItem.Value);
                    ds = DBMethod.SelectSKUname(FacilityId.SelectedItem.Value.ToString());
                     ASPxComboBox cmb = e.Editor as ASPxComboBox;
                    SMgmt.PropddsUserRole = ds;
                    cmb.DataSource = ds;
                    cmb.ValueField = "SKU";
                    //cmb.ValueType = typeof(int);
                    cmb.TextField = "SKU";
                    cmb.DataBindItems();
                }
 if (e.Column.FieldName == "UOM")
                {
                    var combo = (ASPxComboBox)e.Editor;
                    combo.Callback += new CallbackEventHandlerBase(cmbUOM_OnCallback);
                    var grid = e.Column.Grid;
                    if (!combo.IsCallback)
                    {
                        string SKU = "";
                        if (!grid.IsNewRowEditing)
                            SKU = (String)grid.GetRowValues(e.VisibleIndex, "SKU");
                        FillUOMCombo(combo, SKU);
                    }
                }
}
 protected void FillUOMCombo(ASPxComboBox cmb, String SKU)
        {
            FacilityId = ((DevExpress.Web.ASPxCallbackPanel)this.Page.Master.FindControl("cmpMastePageCallBackPanel")).FindControl("TitleContent").FindControl("cmbFacility") as DevExpress.Web.ASPxComboBox;
            string val = FacilityId == null ? String.Empty : FacilityId.SelectedItem == null ? String.Empty : Convert.ToString(FacilityId.SelectedItem.Value);
            DataSet ds = DBMethod.SelectUOMname((SKU), val);
            cmb.DataSource = ds;
            cmb.ValueField = "UOM";
            cmb.ValueType = typeof(string);
            cmb.TextField = "UOM";
            cmb.DataBindItems();
        }
        void cmbUOM_OnCallback(object source, CallbackEventArgsBase e)
        {     

            var UOM = -1;
            Int32.TryParse(e.Parameter, out UOM);
            FillUOMCombo(source as ASPxComboBox, UOM.ToString());

        }

Answer 1

void cmbUOM_OnCallback(object source, CallbackEventArgsBase e)
        {
            ASPxComboBox combo = (ASPxComboBox)source;
            FillUOMCombo(combo, e.Parameter);
        }

此方法用于在组合框中获取文本