DevExpress gridControl 绑定数据源之后添加非绑定列

using (DevExpress.Utils.WaitDialogForm dlg = new DevExpress.Utils.WaitDialogForm("请稍等", "查询中......", new System.Drawing.Size(100, 50)))
            {
                string sqlString = "SELECT  ITEM ,DESCRIPTION ,CATEGORY3  FROM WIPDBA.TIME_IMA x WHERE x.SITE = '1140' ";//and x.ITEM = '1000080309'
                var aa = ado.ExecuteDataTable(sqlString);
                gridControl1.DataSource = aa;
                //string fieldtitle = "物料组名称";
                //string fieldname = "物料组名称";
                //DevExpress.Data.UnboundColumnType ctype = DevExpress.Data.UnboundColumnType.String;
                //gridView1._创建一个非绑定列(fieldname, fieldtitle, ctype);
            }


            gridView1.CustomUnboundColumnData += GridView1_CustomUnboundColumnData;

config.物料描述缓存 = DB.xmdb.Select<Z_ERP_T023T>().ToList();

private void GridView1_CustomUnboundColumnData(object sender, DevExpress.XtraGrid.Views.Base.CustomColumnDataEventArgs e)
        {
            if (e.Column.FieldName == "物料组名称" && e.IsGetData)
                e.Value = config.物料描述缓存.Find(a => a.MATKL == (e.Row as DataRowView).Row["CATEGORY3"]?.ToString())?.WGBEZ;
        }