如何禁用WPF中更新GridView時的滾動條更改

Question

我有關於Gridview更新的問題。我使用ObservableCollection綁定數據，每當ObservableCollection更新時，網格也會更新。但是，滾動條在每次更新時都會顯示在頂部。例如，我正在處理（閱讀有關所選行的詳細信息，更新行等），同時更多數據不斷添加到網格中。在每次更新時，用戶界面也會更新，滾動條將顯示在頂部。這中斷了我所選擇的行的工作。

我也不想在每次更新後再保存當前行並將焦點保存到這一行，因爲這也會中斷我的進程並凍結它。我基本上不想更新我的Grid的當前可用行。當新數據到來時，它應該被添加到我的網格的末尾，這個過程不應該中斷我的工作與以前的行。感謝您的幫助。

Answer 1

您可以通過修改模板來訪問DataGrid的內部ScrollViewer。雖然通常情況下，您不會將事件處理程序放在模板後面，但如果將模板聲明爲內聯，則可以將它與將它附加到DataGrid本身時的方式相同。這是從混合生成的默認模板包括在ScrollViewer中添加的處理程序RequestBringIntoView事件：

<ControlTemplate TargetType="{x:Type Controls:DataGrid}"> 
<Border SnapsToDevicePixels="True" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Padding="{TemplateBinding Padding}"> 
    <ScrollViewer x:Name="DG_ScrollViewer" Focusable="False" RequestBringIntoView="DG_ScrollViewer_RequestBringIntoView"> 
     <ScrollViewer.Template> 
      <ControlTemplate TargetType="{x:Type ScrollViewer}"> 
       <Grid> 
        <Grid.RowDefinitions> 
         <RowDefinition Height="Auto"/> 
         <RowDefinition Height="*"/> 
         <RowDefinition Height="Auto"/> 
        </Grid.RowDefinitions> 
        <Grid.ColumnDefinitions> 
         <ColumnDefinition Width="Auto"/> 
         <ColumnDefinition Width="*"/> 
         <ColumnDefinition Width="Auto"/> 
        </Grid.ColumnDefinitions> 
        <Button Width="{Binding CellsPanelHorizontalOffset, RelativeSource={RelativeSource FindAncestor, AncestorLevel=1, AncestorType={x:Type Controls:DataGrid}}}" Focusable="False"> 
         <Button.Visibility> 
          <Binding Path="HeadersVisibility" RelativeSource="{RelativeSource FindAncestor, AncestorLevel=1, AncestorType={x:Type Controls:DataGrid}}"> 
           <Binding.ConverterParameter> 
            <Controls:DataGridHeadersVisibility>All</Controls:DataGridHeadersVisibility> 
           </Binding.ConverterParameter> 
          </Binding> 
         </Button.Visibility> 
         <Button.Template> 
          <ControlTemplate TargetType="{x:Type Button}"> 
           <Grid> 
            <Rectangle x:Name="Border" Fill="{DynamicResource {x:Static SystemColors.ControlBrushKey}}" SnapsToDevicePixels="True"/> 
            <Polygon x:Name="Arrow" Fill="Black" Stretch="Uniform" HorizontalAlignment="Right" Margin="8,8,3,3" VerticalAlignment="Bottom" Opacity="0.15" Points="0,10 10,10 10,0"/> 
           </Grid> 
           <ControlTemplate.Triggers> 
            <Trigger Property="IsMouseOver" Value="True"> 
             <Setter Property="Stroke" TargetName="Border" Value="{DynamicResource {x:Static SystemColors.ControlDarkBrushKey}}"/> 
            </Trigger> 
            <Trigger Property="IsPressed" Value="True"> 
             <Setter Property="Fill" TargetName="Border" Value="{DynamicResource {x:Static SystemColors.ControlDarkBrushKey}}"/> 
            </Trigger> 
            <Trigger Property="IsEnabled" Value="False"> 
             <Setter Property="Visibility" TargetName="Arrow" Value="Collapsed"/> 
            </Trigger> 
           </ControlTemplate.Triggers> 
          </ControlTemplate> 
         </Button.Template> 
         <Button.Command> 
          <RoutedCommand/> 
         </Button.Command> 
        </Button> 
        <Custom:DataGridColumnHeadersPresenter x:Name="PART_ColumnHeadersPresenter" Grid.Column="1"> 
         <Custom:DataGridColumnHeadersPresenter.Visibility> 
          <Binding Path="HeadersVisibility" RelativeSource="{RelativeSource FindAncestor, AncestorLevel=1, AncestorType={x:Type Controls:DataGrid}}"> 
           <Binding.ConverterParameter> 
            <Controls:DataGridHeadersVisibility>Column</Controls:DataGridHeadersVisibility> 
           </Binding.ConverterParameter> 
          </Binding> 
         </Custom:DataGridColumnHeadersPresenter.Visibility> 
        </Custom:DataGridColumnHeadersPresenter> 
        <ScrollContentPresenter x:Name="PART_ScrollContentPresenter" Grid.ColumnSpan="2" Grid.Row="1" Content="{TemplateBinding Content}" ContentStringFormat="{TemplateBinding ContentStringFormat}" ContentTemplate="{TemplateBinding ContentTemplate}" CanContentScroll="{TemplateBinding CanContentScroll}" CanHorizontallyScroll="False" CanVerticallyScroll="False"/> 
        <ScrollBar x:Name="PART_VerticalScrollBar" Visibility="{TemplateBinding ComputedVerticalScrollBarVisibility}" Grid.Column="2" Grid.Row="1" Maximum="{TemplateBinding ScrollableHeight}" Value="{Binding VerticalOffset, Mode=OneWay, RelativeSource={RelativeSource TemplatedParent}}" Orientation="Vertical" ViewportSize="{TemplateBinding ViewportHeight}"/> 
        <Grid Grid.Column="1" Grid.Row="2"> 
         <Grid.ColumnDefinitions> 
          <ColumnDefinition Width="{Binding NonFrozenColumnsViewportHorizontalOffset, RelativeSource={RelativeSource FindAncestor, AncestorLevel=1, AncestorType={x:Type Controls:DataGrid}}}"/> 
          <ColumnDefinition Width="*"/> 
         </Grid.ColumnDefinitions> 
         <ScrollBar x:Name="PART_HorizontalScrollBar" Visibility="{TemplateBinding ComputedHorizontalScrollBarVisibility}" Grid.Column="1" Maximum="{TemplateBinding ScrollableWidth}" Value="{Binding HorizontalOffset, Mode=OneWay, RelativeSource={RelativeSource TemplatedParent}}" Orientation="Horizontal" ViewportSize="{TemplateBinding ViewportWidth}"/> 
        </Grid> 
       </Grid> 
      </ControlTemplate> 
     </ScrollViewer.Template> 
     <ItemsPresenter SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/> 
    </ScrollViewer> 
</Border> 

Answer 2

嘗試這在您的TableView中設置爲false：

AllowScrollToFocusedRow =「假」