Proposed Solution:
add a new Sorting collection property like in the XPCollection class and provide a new method ApplySort to force resorting manually
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Now, when you add/remove the CollectionSourceBase.Sorting list items, sorting is immediately applied to the inner collection. Do not add several elements one after another. Instead, populate a temporary SortProperty list and then assign it to CollectionSourceBase.Sorting. The example below is taken from the ListView.LoadModelCore method implementation.
List<SortProperty> sorting = new List<SortProperty>(); foreach(IModelSortProperty sortProperty in Model.Sorting) { sorting.Add(new SortProperty(sortProperty.PropertyName, sortProperty.Direction)); } collectionSource.Sorting = sorting;
In this instance, all SortProperty items will be applied simultaneously.