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ICollectionView view = CollectionViewSource.GetDefaultView(dataSource);//dataSource为数据源
view.SortDescriptions.Clear();
if (isAcsending)
{
isAcsending = false;
view.SortDescriptions.Add(new SortDescription("Id", ListSortDirection.Ascending));//升序
}
else
{
isAcsending = true;
view.SortDescriptions.Add(new SortDescription("Id", ListSortDirection.Descending));//降序
}