Question

我有一个列表框，我可以使用数据成功更新但现在我想访问两个特定的文本块，我想要折叠并使另一个可见。这是我的xaml：

<ListBox Grid.Row="3" Grid.Column="0" Grid.ColumnSpan="3" HorizontalAlignment="Stretch" Name="myPM_MListBox" Margin="-5,0,-5,0" SelectionChanged="myPMListBox_SelectionChanged">
  <ListBox.ItemContainerStyle>
    <Style TargetType="ListBoxItem">
      <Setter Property="HorizontalContentAlignment" Value="Stretch"></Setter>
    </Style>
  </ListBox.ItemContainerStyle>
  <ListBox.ItemTemplate>
    <DataTemplate>
      <Grid Margin="0,0,0,0" HorizontalAlignment="Stretch">
        <Grid.RowDefinitions>
          <RowDefinition Height="Auto" />
          <RowDefinition Height="Auto" />
          <RowDefinition Height="Auto" />
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
          <ColumnDefinition Width="150" />
          <ColumnDefinition Width="*" />
        </Grid.ColumnDefinitions>
        <Border Grid.Row="0" Grid.Column="0" Margin="5,0,0,0" Background="#FF009E49" BorderThickness="1" BorderBrush="#FF505050">
          <TextBlock Margin="5,5,5,5" Text="Message Date" FontSize="16" HorizontalAlignment="Left" TextWrapping="Wrap" VerticalAlignment="Top" Foreground="#FFFFFFFF" FontWeight="Normal" />
        </Border>
        <Border Grid.Row="0" Grid.Column="1" Margin="0,0,5,0" Background="#FFEFEFEF" BorderThickness="1" BorderBrush="#FF505050">
          <TextBlock Margin="5,5,5,5" x:Name="PMMessagePubDate" Text="{Binding shdMsgPublishTime}" FontSize="16" HorizontalAlignment="Left" TextWrapping="Wrap" VerticalAlignment="Top" Foreground="#FF000000" FontWeight="Normal" />
        </Border>
        <Border Grid.Row="1" Grid.Column="0" Grid.ColumnSpan="2" Margin="5,0,5,0" Background="#FFEFEFEF" BorderThickness="1,1,1,0" BorderBrush="#FF505050">
          <TextBlock Margin="5,5,5,5" x:Name="PM_MLimitedBody" Text="{Binding shdMessageText}" FontSize="16" HorizontalAlignment="Left" TextWrapping="Wrap" VerticalAlignment="Top" Foreground="#FF000000" FontWeight="Normal" />
        </Border>
        <Border Grid.Row="2" Grid.Column="0" Grid.ColumnSpan="2" Margin="5,0,5,0" Background="#FFEFEFEF" BorderThickness="1,0,1,1" BorderBrush="#FF505050">
          <TextBlock Margin="5,5,5,5" x:Name="PM_MFullBody" Text="Show more..." FontSize="16" HorizontalAlignment="right" TextWrapping="Wrap" VerticalAlignment="Top" Foreground="Blue" FontWeight="Normal" Tapped="ShowFullBody_Tap" />
        </Border>
      </Grid>
    </DataTemplate>
  </ListBox.ItemTemplate>
</ListBox>

我想隐藏PM_MLimitedBody文本块并显示我拥有的ShowFullBody_Tap事件处理程序的PM_MFullBody文本块。但似乎我无法在我的.cs文件中访问这些textblok的Visibility属性。有没有办法在我的.cs文件中访问这些textblock的visibility属性？

Answer 1

您可以使用ShowFullBody_Tap的发件人定义该事件的TextBox。然后，您可以使用VisualTreeHelper.GetParent(...)获取Border，然后使用Grid，然后查看Grid.Children以查找其文本框中的其他边框。

如何访问列表框中的texblock？

1 个答案: