WPF过滤CollectionViewSource

Question

我有一个WPF项目，它从数据集中提取数据。在一个特定的视图中，我有一个网格，我想显示数据的过滤版本。

我读到我不能过滤BindingListView，但这是一个CollectionViewSource

我的密码是：-

Private Sub UserControl_Loaded_1(sender As Object, e As RoutedEventArgs) Handles MyBase.Loaded

 Dim _ds As CantileverDataSet
 Dim _carcasseTableAdapter As CantileverDataSetTableAdapters.MaterialsTableAdapter
 Dim _carcasseViewSource As CollectionViewSource

 _ds = CType(Me.FindResource("CantileverDataSet"), CantileverDataSet)

 _carcasseTableAdapter = New CantileverDataSetTableAdapters.MaterialsTableAdapter
 _carcasseTableAdapter.Fill(_ds.Materials)
 _carcasseViewSource = CType(Me.FindResource("MaterialsViewSource"), CollectionViewSource)

 AddHandler _carcasseViewSource.Filter, AddressOf CarcasseFilter
End Sub

Private Sub CarcasseFilter(ByVal sender As System.Object, ByVal e As FilterEventArgs)
    'Accept everything for now

    e.Accepted = True
End Sub

我得到的错误是

'System.Windows.Data.BindingListCollectionView‘视图不支持筛选。

• 如果我做了_carcasseViewSource.GetType，我得到了CollectionViewSource
• 如果我做了_carcasseViewSource.View.GetType，我得到了BindingListCollectionView

就好像它把我的_carcasseViewSource当作BindingListCollectionView一样对待

这是网格的XAML，以防万一

    <Grid x:Name="CarcasseGrid" DataContext="{StaticResource MaterialsViewSource}" >
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="Auto"/>
            <ColumnDefinition Width="Auto"/>
        </Grid.ColumnDefinitions>
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="Auto"/>
        </Grid.RowDefinitions>
        <Label Content="Material Code:" Grid.Column="0" Grid.Row="0"/>
        <TextBox x:Name="MaterialCodeTextBox" Grid.Column="1" Grid.Row="0" Text="{Binding MaterialCode, Mode=TwoWay, NotifyOnValidationError=true, ValidatesOnExceptions=true}"/>
        <Label Content="Name:" Grid.Column="0" Grid.Row="1"/>
        <TextBox x:Name="NameTextBox" Grid.Column="1" Grid.Row="1" Text="{Binding Name, Mode=TwoWay, NotifyOnValidationError=true, ValidatesOnExceptions=true}"/>
    </Grid>

Answer 1

在使用数据集/数据表时，可以使用IBindingListView.Filter。

查看筛选器表达式的这