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我有很多 ListView，每个都绑定到自己的 ListCollectionView，每个都有相同的 ContextMenu 需求。我不想重复同样的 ContextMenu N 次，所以我在 Resources 中定义它并通过 StaticResource 引用它。

当右键单击 ListView 中的项目 X 并单击 MenuItem 时，如何在代码隐藏中访问对象 X？

<Window.Resources>
    <ContextMenu x:Key="CommonContextMenu">
        <MenuItem Header="Do Stuff" Click="DoStuff_Click" />
    </ContextMenu>
</Window.Resources>

<ListView ItemsSource="{Binding Path=ListCollectionView1}" ContextMenu="{StaticResource CommonContextMenu}">
    ...
</ListView>

<ListView ItemsSource="{Binding Path=ListCollectionView2}" ContextMenu="{StaticResource CommonContextMenu}">
    ...
</ListView>

private void DoStuff_Click(object sender, RoutedEventArgs e)
{
    // how do i get the selected item of the right listview?
}

更新

感谢 Michael Gunter 的回答，我现在使用以下扩展方法：

public static ListView GetListView(this MenuItem menuItem)
{
    if (menuItem == null)
        return null;

    var contextMenu = menuItem.Parent as ContextMenu;
    if (contextMenu == null)
        return null;

    var listViewItem = contextMenu.PlacementTarget as ListViewItem;
    if (listViewItem == null)
        return null;

    return listViewItem.GetListView();
}

public static ListView GetListView(this ListViewItem item)
{
    for (DependencyObject i = item; i != null; i = VisualTreeHelper.GetParent(i))
    {
        var listView = i as ListView;
        if (listView != null)
            return listView;
    }

    return null;
}
4

1 回答 1

1

1）将上下文菜单放在 each 中的每个项目上ListView，而不是每个项目ListView本身。这样可以避免在单击ListView. 为此，请使用该ListView.ItemContainerStyle属性。（如果您真的想要上下文菜单ListView本身，请告诉我，我会相应地编辑此答案。）

<Window.Resources>
    <ContextMenu x:Key="CommonContextMenu">
        <MenuItem Header="Do Stuff" Click="DoStuff_Click" />
    </ContextMenu>
    <Style x:Key="ListViewItemStyle" TargetType="{x:Type ListViewItem}">
        <Setter Property="ContextMenu" Value="{StaticResource CommonContextMenu}" />
    </Style>
</Window.Resources>

<ListView ItemsSource="{Binding Path=ListCollectionView1}" ItemContainerStyle="{StaticResource ListViewItemStyle}">
    ...
</ListView>
<ListView ItemsSource="{Binding Path=ListCollectionView2}" ItemContainerStyle="{StaticResource ListViewItemStyle}">
    ...
</ListView>

2) 使用如下代码确定右键单击的项目。

private void DoStuff_Click(object sender, RoutedEventArgs e)
{
    var menuItem = sender as MenuItem;
    if (menuItem == null)
        return;

    var contextMenu = menuItem.Parent as ContextMenu;
    if (contextMenu == null)
        return;

    var listViewItem = contextMenu.PlacementTarget as ListViewItem;
    if (listViewItem == null)
        return;

    var listView = GetListView(listViewItem);
    if (listView == null)
        return;

    // do stuff here
}

private ListView GetListView(ListViewItem item)
{
    for (DependencyObject i = item; i != null; i = VisualTreeHelper.GetParent(i))
    {
        var listView = i as ListView;
        if (listView != null)
            return listView;
    }
    return null;
}
于 2013-07-31T21:24:37.087 回答