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Karol von Zmuda Trzebiatowski
95
XamDataGrid last added item is duplicated (just visual)
posted

Hello,

I have a XamDataGrid bound to an ListCollectionView (which has an underlying CollectionViewSource that is referencing an ObservableCollection).

When I add an item and update the ObservableCollection then the last added item is duplicated in the visual display.

Adding a second item will remove the duplicate but add a duplicated of the second item.

I have attached a sample project that shows the issue.

In "ItemListViewModel.cs" when I comment the row 44, then the issue disappears.

  1. Why is assigning a filter creating this issue?
  2. Is there a workaround to fix the issue?

Thanks in advice.

WpfApp1_gridDuplicates.zip

  • 7555
    Offline posted

    Hello,

    Thank you for sharing your sample for the investigation, so i debug the code and looks like a timing issue, your filter been applied too early that litemlist view is not yet updated, so when i put the filter in beginInvoke its working fine . 

    So your code would be :

    Dispatcher.CurrentDispatcher.BeginInvoke(new Action(() =>
    {
    ItemListView.Filter = o => ItemListViewFilter((DataItem)o);
    }));