Sorted collection is not sorted in table

[JanRajnoha]

Hello,
I'm currently implementing preview version of TableView (1.4.0) where I have about 500 items. I need items sorted, but when i check displayed data, they are not sorted by any property, it is completely random.

What I do:

1. Load items
2. Sort items
3. Load items into TableView via binding
4. Data are random placed

Interesting is, when i do custom filtration and clear it, data are correctly sorted.
I checked collection, that is loaded into table and is sorted correctly.

Do you know, what could be problem? What could I try to make it work correctly?
Thank you for your ideas

[w-ahmad]

It's hard to assume what's going on, could you paste the code here so I can see your implementation?

[JanRajnoha]

Okay,

I get items from API and sorted it:

Items = [.. result.Data.OrderBy(x => x.StartTime).ThenBy(x => x.SelectedTableItemId)];

I checked data in Items and are correctly sorted. Items is ObservableCollection
After it, I will bind Items into TableView and result is how I mentioned, unsorted data.

When I do some full text filter and clear it, it will get sorted data correctly. Collection is not modified during time

Full text search code:

private bool FullTextFilter(object item)
{
    if (string.IsNullOrWhiteSpace(_fullText)) return true;
    if (item is null) return false;

    var model = item as ReservationListModel;
    return model.Name?.Contains(_fullText, StringComparison.OrdinalIgnoreCase) is true ||
           model.Email?.Contains(_fullText, StringComparison.OrdinalIgnoreCase) is true ||
           model.PhoneNumber?.Contains(_fullText, StringComparison.OrdinalIgnoreCase) is true;
}

I checked IDs, that are in sorted list and are randomized through whole table

I tied sort with ID, but result is same

I don't know, if it is problem of list view, but I found out, if users scroll too fast through ListView, they could get random items at the end of list.

[w-ahmad]

It seems like there’s some odd behavior with the base control. I suspected it might be an issue with CollectionView, but after testing, it appears to be working fine. It would be great if you could upload a test app so I can reproduce the problem and pinpoint exactly where the issue lies.

[JanRajnoha]

I will try it, if i could not repro it, i will somehow share code how to log and retrieve data from api

[JanRajnoha]

Unfortunately, i could not reproduce it outside my solution, so i will do hack, that will filter it and restore data, after it is correctly displayed

[w-ahmad]

got it.
try using VirtualizingStackPanel as ItemsPanel just for the sake of testing.

[JanRajnoha]

i tried it, but currently scroll horizontally is not working (according to docs expected) and result is same - not sorted correctly.
I tried items by group of 10 (ObservableCollection, adding by Add, same result with List) with 200ms break between group add and even if i take as first items with IDs 1,2 and 3, ID 3 item is about on 30-40th position in TableView.

Interesting is fact, that TableView is looking always same, so if that item is on position for example 20, it will be on position 20 even if I try adding by groups, if I have my previous solution, if I try something else approach, always same