Wpf ICollectionView Binding item cannot resolve property of type object

Question

I have bound a GridView with an ICollectionView in the XAML designer the properties are not known because the entity in the CollectionView

Answer 1

Neither d:DataContext="{d:DesignInstance Type=lcl:ViewModel}"> nor GenericCollectionView works directly for a DataGrid with a CollectionViewSource.

We can't set "d:DataContext"; because, we often need to bind multiple properties to our viewmodel.

The CollectionViewSource creates new ListCollectionView which is runtime instantiated each time you set the Source property. Since setting the Source property is the only reasonable way to refresh a range of rows, we can't keep a GenericCollectionView around.

My solution is perhaps perfectly obvious, but I dumped the CollectionViewSource. By making creating a property

private ObservableCollection _rowDataStoreAsList;
public GenericCollectionView TypedCollectionView
{
  get => _typedCollectionView;
  set { _typedCollectionView = value; OnPropertyChanged();}
}

public void FullRefresh()
{
    var listData = _model.FetchListingGridRows(onlyListingId: -1);
    _rowDataStoreAsList = new ObservableCollection(listData);
    var oldView = TypedCollectionView;
    var saveSortDescriptions = oldView.SortDescriptions.ToArray();
    var saveFilter = oldView.Filter;
    TypedCollectionView = new GenericCollectionView(new ListCollectionView(_rowDataStoreAsList));
    var newView = TypedCollectionView;
    foreach (var sortDescription in saveSortDescriptions)
    {
        newView.SortDescriptions.Add(new SortDescription()
        {
            Direction = sortDescription.Direction,
            PropertyName = sortDescription.PropertyName
        });
    }
    newView.Filter = saveFilter;
}
internal void EditItem(object arg)
{
    var view = TypedCollectionView;
    var saveCurrentPosition = view.CurrentPosition;
    var originalRow = view.TypedCurrentItem;
    if (originalRow == null)
        return;
    var listingId = originalRow.ListingId;
    var rawListIndex = _rowDataStoreAsList.IndexOf(originalRow);
    // ... ShowDialog ... DialogResult ...
    var lstData = _model.FetchListingGridRows(listingId);
    _rowDataStoreAsList[rawListIndex] = lstData[0];
    view.MoveCurrentToPosition(saveCurrentPosition);
    view.Refresh();
}

After adding public T TypedCurrentItem => (T)collectionView.CurrentItem; To the GenericCollectionView provided by Maxence.