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I need to have a collection displayed in a ListView. For that, i have a CompositeCollection with one ListViewItem as a searchbar for the collection. I put it together with a list of "n" items. The reason to do that, is that i need the searchbar is not influenced by sorting. The problem is, that the CollectionView i bind to a CollectionViewSource produces an BindingError and i don´t know why.

My XAML-Code for the Collections:

<Grid.Resources>
 <CollectionViewSource x:Key="ElementSource" Source="Binding ElementsCollectionView"/>
 <CompositeCollection x:Key="CompositeCollection">
 <ListViewItem Content="Binding HeaderRow"/>
 <CollectionContainer Collection="Binding Source=StaticResource ElementSource"/>
 </CompositeCollection>
</Grid.Resources>

And the Collections I use

private NotifyCollection<DataEntry> _data;
public NotifyCollection<DataEntry> Data

 get return this._data; 
 set this.SetProperty(ref this._data, value); 


private CollectionView _elementsCollectionView;
public CollectionView ElementsCollectionView

 get return this._elementsCollectionView; 
 set
 
 if (value == null) return;
 this._elementsCollectionView = value;
 


private CompositeCollection _tableItems;
public CompositeCollection TableItems

 get return this._tableItems; 
 set this.SetProperty(ref this._tableItems, value); 


private DataEntry _headerRow;
public DataEntry HeaderRow

 get return this._headerRow; 
 set this.SetProperty(ref this._headerRow, value); 

And the Collections being initalised:

public void SetCollection()

 this.TableItems.Add(this.HeaderRow);
 this.TableItems.Add(this.ElementsCollectionView);


this.TableViewModel.ElementsCollectionView = 
 (CollectionView)CollectionViewSource.GetDefaultView(this.Data);

As you can see, everything seem´s ok. The NotifyCollection inherits from ObservableCollection and should do hte work. If I add the HeaderRow to to the "ElementsCollectionView" everything works fine, except the HeaderRow is sorted. If i add the CollectionView to the CollectionViewSource, i get the BindingError:

 System.Windows.Data Error: 5 : Value produced by BindingExpression is 
 not valid for target property.; 
 Value='System.Windows.Data.ListCollectionView' 
 BindingExpression:Path=ElementsCollectionView; 
 DataItem='AuftragsverwaltungDataTableViewModel' (HashCode=57170378); 
 target element is 'CollectionViewSource' (HashCode=52642430); target property is 'Source' (type 'Object')

You can't set the Source property of a CollectionViewSource to a ListCollectionView. This will throw an ArgumentException. Sort the NotifyCollection<DataEntry> collection and bind to this one instead.