这是基于此示例的解决方法。主要思想是创建汇总项,显示组内列
的最小值或最大值,并按此汇总值对组进行排序。对于此事件,用于更改排序行为。
这是示例:Country
City
City
BeforeColumnSortingGrouping
<dx:ASPxGridView ...
OnBeforeColumnSortingGrouping="gridCustomers_BeforeColumnSortingGrouping">
private void SortByCountry()
{
gridCustomers.GroupSummary.Clear();
gridCustomers.GroupSummarySortInfo.Clear();
var sortOrder = gridCustomers.DataColumns["Country"].SortOrder;
SummaryItemType summaryType = SummaryItemType.None;
switch (sortOrder)
{
case ColumnSortOrder.None:
return;
break;
case ColumnSortOrder.Ascending:
summaryType = SummaryItemType.Min;
break;
case ColumnSortOrder.Descending:
summaryType = SummaryItemType.Max;
break;
}
var groupSummary = new ASPxSummaryItem("Country", summaryType);
gridCustomers.GroupSummary.Add(groupSummary);
var sortInfo = new ASPxGroupSummarySortInfo();
sortInfo.SortOrder = sortOrder;
sortInfo.SummaryItem = groupSummary;
sortInfo.GroupColumn = "City";
gridCustomers.GroupSummarySortInfo.AddRange(sortInfo);
}
protected void Page_Load(object sender, EventArgs e)
{
SortByCountry();
}
protected void gridCustomers_BeforeColumnSortingGrouping(object sender, ASPxGridViewBeforeColumnGroupingSortingEventArgs e)
{
SortByCountry();
}