no se puede borrar la colección WPF ListBox.SelectedItems
Parece que no puedo borrar la colección SelectedItems de un ListBox de WPF enlazado a datos. He intentado llamar a ListBox.SelectedItems.Clear (), he intentado establecer el SelectedIndex en -1, establecer el SelectedItem en nulo y llamar a ListBox.UnselectAll (). Durante la depuración, parece que las asignaciones no son correctas o que algo se está reiniciando en la colección de SelectedItems, pero no estoy seguro de qué. Puse un punto de interrupción en la devolución de llamada SelectionChanged y nunca se golpea de forma inesperada, sin embargo, el miembro SelectedItems.Count siempre es al menos 1 (a veces más de 1, ya que el modo de selección de este ListBox es MultiExtended).
¿Alguien ha visto esto antes y sabe que estoy haciendo mal? Esta pregunta es aparentemente exactamente la misma que esta:WPF - ¿Cómo borrar la selección de ListView?
excepto en esa publicación, Sonny Boy está usando un ListView y yo estoy usando un ListBox. En cualquier caso, la respuesta votada fue llamar a ListView.UnselectAll () que no funciona en mi caso.
Siento que debo estar haciendo algo muy obviamente mal, ya que limpiar la selección debería ser bastante sencillo.
NOTA: Solo para ser claros, no quiero eliminar las selecciones del ListBox, solo quiero que no se seleccione nada.
¡Gracias!
<ListBox Background="{StaticResource ResourceKey=DarkGray}" Name="lbx_subimageThumbnails" Margin="6,6,6,0" ItemsSource="{Binding ElementName=lbx_thumbnails, Path=SelectedItem.Swatches}" Style="{StaticResource WPTemplate}" SelectionMode="Extended" Height="{Binding ElementName=sld_swatchRows, Path=Value}" VerticalAlignment="Top" SelectionChanged="lbx_subimageThumbnails_SelectionChanged" DataContext="{Binding}">
<ListBox.ItemsPanel>
<ItemsPanelTemplate>
<WrapPanel HorizontalAlignment="Stretch" />
</ItemsPanelTemplate>
</ListBox.ItemsPanel>
<ListBox.ItemContainerStyle>
<Style TargetType="{x:Type ListBoxItem}">
<Setter Property="Visibility" Value="{Binding Path=Vis}" />
</Style>
</ListBox.ItemContainerStyle>
<ListBox.ItemTemplate>
<DataTemplate>
<Grid Width="270" Height="270" Margin="5,5,5,5" Tag="{Binding}" Name="lbx_swatchThumbnail" Background="{StaticResource ResourceKey=LightGray}" PreviewMouseLeftButtonDown="lbx_swatchThumbnail_PreviewMouseLeftButtonDown" PreviewMouseMove="lbx_swatchThumbnail_PreviewMouseMove">
<Grid.LayoutTransform>
<ScaleTransform CenterX="0" CenterY="0" ScaleX="0.50" ScaleY="0.50" />
</Grid.LayoutTransform>
<Grid.ContextMenu>
<ContextMenu>
<MenuItem Header="Sync selected" Click="btn_syncSwatch_Click" />
<MenuItem Header="Re-export selected" Click="btn_exportSelected_Click"/>
<MenuItem Header="Set as default thumbnail" Click="btn_setThumbnail_Click"/>
<MenuItem Header="Delete selected" Click="btn_deleteSwatch_Click"/>
<MenuItem Header="Show in Explorer" Click="mnu_showSwatchesInExplorer_Click" />
<MenuItem Header="Create Frames" Click="mnu_createFrames_Click" ToolTip="Creates FRAMEs groups to your PSD file under the Group associated with the selected swatch. DO NOT RE-ORDER OR RENAME THE GENERATED groups!" />
<MenuItem Header="Create MIPs" Click="mnu_createMIPs_Click" ToolTip="Creates MIPs groups to your PSD file under the Group associated with the selected swatch. DO NOT RE-ORDER OR RENAME THE GENERATED groups!" />
</ContextMenu>
</Grid.ContextMenu>
<Border BorderBrush="Black" BorderThickness="1">
<Grid ToolTip="{Binding Path=Texture}">
<Image VerticalAlignment="Center" HorizontalAlignment="Center" PhotoLoader:Loader.DisplayOption="Preview" PhotoLoader:Loader.DisplayWaitingAnimationDuringLoading="True" PhotoLoader:Loader.Source="{Binding Path=Texture}" PhotoLoader:Loader.DisplayErrorThumbnailOnError="True" Width="256" Height="256" />
<TextBlock VerticalAlignment="Top" HorizontalAlignment="Center" Margin="0,10,0,0" FontSize="20" Text="{Binding Path=Group}" Background="Black" Foreground="White"/>
<TextBlock VerticalAlignment="Bottom" HorizontalAlignment="Center" Background="Black" Margin="0,0,0,10" FontSize="20" Foreground="White">
<TextBlock.Text>
<MultiBinding StringFormat="{}{0} x {1} {2}" >
<Binding Path="Width" />
<Binding Path="Height" />
<Binding Path="Format" />
</MultiBinding>
</TextBlock.Text>
</TextBlock>
</Grid>
</Border>
</Grid>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
// this callback kicks everything off. private void btn_editSwatch_Click(object sender, RoutedEventArgs e) { // get a list of the selected indices - we will have to unselect the texture source and reselect it after the re-export in order to force the thumbnail display to update // so we will save a list of indices to reselect them after the export List selectedIndices = new List(); for (int i = 0; i < lbx_subimageThumbnails.Items.Count; i++) { if (lbx_subimageThumbnails.SelectedItems.Contains(lbx_subimageThumbnails.Items[i])) { selectedIndices.Add(i); } }<p></p> <pre><code> // store the index of the selected texture source to reselect it after the re-export int selIndex = lbx_thumbnails.SelectedIndex; // edit and re-export the selected thumbnails if (this.EditThumbnails(lbx_subimageThumbnails.SelectedItems, lbx_thumbnails.SelectedItem)) { // re-select the texture source lbx_thumbnails.SelectedIndex = selIndex; // re-select the previously selected thumbnails. foreach (int index in selectedIndices) { if (!lbx_subimageThumbnails.SelectedItems.Contains(lbx_subimageThumbnails.Items[index])) { lbx_subimageThumbnails.SelectedItems.Add(lbx_subimageThumbnails.Items[index]); } } } } private void lbx_subimageThumbnails_SelectionChanged(object sender, SelectionChangedEventArgs e) { ListBox textureSelector = sender as ListBox; if (textureSelector != null) { //update some UI elements } } /* this is the SelectionChanged callback for another listbox which is bound as the ItemSource of lbx_subimageThumbnails. When the selection here changes, we default the selection of the subimage listbox to the first subimage after first clearing the selected items in the subimage listbox */ private void lbx_thumbnails_SelectionChanged(object sender, SelectionChangedEventArgs e) { // clear the previous swatch selection and select the first thumbnail // None of these methods works. after each, lbx_subimageThumbnails.SelectedItems.Count is still >= 1 // Also, trying to set the SelectedIndex doesn't take. After the assignment, debugger shows // SelectedIndex is still 0 lbx_subimageThumbnails.SelectedIndex = -1; lbx_subimageThumbnails.SelectedIndex = -1; // Trying to set SelectedItem to null doesn't work...after assignment, SelectedItem is still a vaild // reference this.lbx_subimageThumbnails.SelectedItem = null; if (lbx_subimageThumbnails.SelectedItems.Count > 0) { lbx_subimageThumbnails.UnselectAll(); lbx_subimageThumbnails.SelectedItems.Clear(); } lbx_subimageThumbnails.SelectedIndex = 0; // reset the preview pane size sld_previewSize.Value = 1.0; } </code></pre>