需求:ListBoxItem上右鍵,將數據傳參。
疑問:ContextMenu不繼承DataContext,導致直接用RelativeSource找根的方式也綁定不到。
解決方法:在ListBox.ContextMenu里寫菜單,就可以直接綁定到ViewModel層的命令了,參數先用RelativeSource找到ContextMenu,再綁定PlacementTarget.SelectedItem。
<ListBox x:Name="ResultBox" Margin="0, 10, 0, 0" Grid.Row="1" BorderThickness="0" ScrollViewer.VerticalScrollBarVisibility="Auto" PreviewMouseDoubleClick="ResultBox_PreviewMouseDoubleClick" ItemsSource="{Binding resultFiles, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"> <ListBox.ItemTemplate> <DataTemplate> <StackPanel> <TextBlock Text="{Binding FileName}" FontSize="18" FontWeight="Bold"/> <TextBlock Text="{Binding FilePath}" Foreground="Gray"/> </StackPanel> </DataTemplate> </ListBox.ItemTemplate> <ListBox.ContextMenu> <ContextMenu> <MenuItem x:Name="OpenFile" Header="打開文件" Command="{Binding OpenFileCommand}" CommandParameter="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=ContextMenu}, Path=PlacementTarget.SelectedItem}"/> <MenuItem x:Name="OpenFolder" Header="打開文件所在文件夾" Click="OpenFolder_Click"/> </ContextMenu> </ListBox.ContextMenu> </ListBox>
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