DevExpress中GridColumnCollection实现父子表数据绑定

绑定数据：

父表：

 DataTable _parent = _dvFlt.ToTable().Copy();

　　子表：

 DataTable _child = _dvLog.ToTable().Copy();

　　关联：

DataSet _ds = new DataSet();
                _ds.Tables.Add(_parent);
                _ds.Tables.Add(_child);

                DataRelation _dr = new DataRelation("", _ds.Tables[0].Columns["flight_id"], _ds.Tables[1].Columns["ref_keys"], false);
                _ds.Relations.Add(_dr);

                dgInfo.DataSource = _ds.Tables[0];

　　主表加载事件：

private void dgInfo_DataSourceChanged(object sender, EventArgs e)
        {

                GridColumnCollection gridColumns = this.gridView1.Columns;
foreach (GridColumn item in gridColumns)
{

}
}

　　子表加载事件：

 private void GridView1_MasterRowExpanded(object sender, DevExpress.XtraGrid.Views.Grid.CustomMasterRowEventArgs e)
        {
            GridView detailView = gridView1.GetDetailView(e.RowHandle, e.RelationIndex) as DevExpress.XtraGrid.Views.Grid.GridView;
            detailView.CustomColumnDisplayText += DetailView_CustomColumnDisplayText;
            GridColumnCollection gridColumns = detailView.Columns;
            foreach (GridColumn item in gridColumns)
{
}
}

　　改变事件格式：

item.DisplayFormat.FormatString = "MM-dd";
                            item.DisplayFormat.FormatType = DevExpress.Utils.FormatType.Custom;