Question

As titled.

So I was successfully to put DataTable into my CollectionView with using:

    ICollectionView _collectionView { get; set; }
    public ICollectionView collectionView {......}

            DataTable myDataTable= new DataTable();
            myConnection.Open();
            dbAdpater.Fill(myDataTable);
            myConnection.Close();
            var collectionList= (newLeadTable as IListSource).GetList();
            this.collectionView = CollectionViewSource.GetDefaultView(collectionList);

I know each of the object in the list is DataRowView and as I tested with iterating the data and I can see is stored properly.

The DataGrid was display properly when I execute the code.

But once I added the Filter:

            this.collectionView.Filter = new Predicate<object>(
                (obj) =>
                {
                    return false; //Just for testing propose
                }
            );

When I execute the code is giving me error:

Cannot create instance of ‘Window1’ defined in assembly ‘TestWPF,
Version=1.0.0.0, Culture=neutral, PublicKeyToken=null’. Exception has
been thrown by the target of an invocation. Error in markup file
‘TestWPF;component/Window1.xaml’ Line 1 Position 9.

And output:

A first chance exception of type ‘System.NotSupportedException’
occurred in PresentationFramework.dll

I also tried to stores converts the DataTable into a list of custom object for filtering, but is working fine.

So I wonder what did I done wrong when filtering with DataTable?

Answer 1

See http://msdn.microsoft.com/en-us/library/ms752347.aspx#binding_to_collections

To improve performance, collection views for ADO.NET DataTable or DataView objects delegate sorting and filtering to the DataView.

The BindingListCollectionView does not support filtering. Instead, you have to use the CustomFilter property which takes a filter string and uses it as the value for the underlying DataView.RowFilter property. The string value is SQL that you would use to construct the WHERE clause in a SELECT query.

this.collectionView.CustomFilter = "Price > 20";

If you want to use multiple conditions, then you have to string them together with AND or OR (just like SQL).