pluskal
commented
9 years ago It seems that when I have added - ScrollViewer.IsDeferredScrollingEnabled="True" the problem had disappeared. I`m sure that the original issue with emitting null item that caused deadlock in the first place could still occur.
<DataGrid x:Name="TstDataGridAsyncFilterSort" Grid.Row="1" CanUserSortColumns="True" ItemsSource="{Binding MyDataVirtualizedAsyncFilterSort, ElementName=TheMainWindow}" Sorting="TstDataGridAsyncFilterSort_Sorting" ScrollViewer.IsDeferredScrollingEnabled="True"
I have done some random scrolling, waited until items are loaded. Is normal that items had not been ordered by ID but some items with lower id had appeared as well.
After that I have tried to order by clicking on the first column header, but app have deadlocked.
Intellitrace and mem dump: https://mega.co.nz/#!4B5klbgY!Yn4-JNfWILGvM4t0OhF7aD258ehWPYQ-AA-TcYKxu6E https://mega.co.nz/#!hQQwRRrb!zSYses0E6LEEZ9yC3Ay7BO8iufgpxFhEhKauT6zuqSg