在WPF

Question

設置使用DataTrigger Grid.Column我試圖用datatrigger設置Grid.Column屬性：

<Style TargetType="ListBox"> 
    <Style.Triggers> 
     <DataTrigger Binding="{Binding View}" Value="HistoryLeft"> 
      <Setter Property="Visibility" Value="Hidden"/> 
     </DataTrigger> 
     <DataTrigger Binding="{Binding View}" Value="HistoryRight"> 
      <Setter Property="Grid.Column" Value="0"/> 
      <Setter Property="Grid.ColumnSpan" Value="2"/> 
     </DataTrigger> 
    </Style.Triggers> 
</Style> 

的Grid.ColumnSpan工作正常，但在Grid.Column沒有設置。有任何想法嗎？

的XAML爲ListBox是：

  <ListBox ItemsSource="{Binding HistoryItemsRight}" BorderThickness="0,1,0,0" Grid.Row="0" Grid.Column="1" ItemsPanel="{StaticResource NoHorizontalScroll}" Background="White" ScrollViewer.VerticalScrollBarVisibility="Visible" 
       HorizontalContentAlignment="Stretch" ItemContainerStyle="{StaticResource HistoryItem}" 
       ScrollViewer.HorizontalScrollBarVisibility="Disabled"> 
        <ListBox.Style> 
         <Style TargetType="ListBox"> 
          <Style.Triggers> 
           <DataTrigger Binding="{Binding View}" Value="HistoryLeft"> 
            <Setter Property="Visibility" Value="Hidden"/> 
           </DataTrigger> 
           <DataTrigger Binding="{Binding View}" Value="HistoryRight"> 
            <Setter Property="Grid.Column" Value="0"/> 
            <Setter Property="Grid.ColumnSpan" Value="2"/> 
           </DataTrigger> 
          </Style.Triggers> 
         </Style> 
        </ListBox.Style> 
        <ListBox.Resources> 
         <ResourceDictionary> 
          <ResourceDictionary.MergedDictionaries> 
           <ResourceDictionary Source="/Resources/HistoryViewTemplates.xaml"/> 
           <ResourceDictionary> 
            <DataTemplate DataType="{x:Type viewModel:HistoryItemView}"> 
             <Grid Style="{StaticResource HistoryItemGrid}"> 
              <Grid.ToolTip> 
               <controls:HistoryViewToolTip></controls:HistoryViewToolTip> 
              </Grid.ToolTip> 
              <Grid.ColumnDefinitions> 
               <ColumnDefinition Width="30" MinWidth="30"/> 
               <ColumnDefinition Width="60" MinWidth="50"/> 
               <ColumnDefinition Width="250*" MinWidth="100"/> 
              </Grid.ColumnDefinitions > 
              <TextBlock Text="{Binding Date, StringFormat=' HH:mm:ss'}" Grid.Column="1"/> 
              <TextBlock Text="{Binding Path}" Grid.Column="2" HorizontalAlignment="Stretch"/> 
              <Button FontWeight="Bold" Padding="2,0,2,0" Margin="0,0,2,0" Width="19" Command="{Binding OperationToRight}" Grid.Column="0" Style="{StaticResource RightSideHistoryButton}" /> 
             </Grid> 
            </DataTemplate> 
           </ResourceDictionary> 
          </ResourceDictionary.MergedDictionaries> 
         </ResourceDictionary> 
        </ListBox.Resources> 
       </ListBox> 

Answer 1

這可能與Dependency Property Value Precedence做。您可能明確地設置了Column，而ColumnSpan使用默認值1。