将contextmenu父级作为CommandParameter传递 [英] pass contextmenu parent as CommandParameter

问题描述

我有一个TreeViewItem的HierarchicalDataTemplate，在模板中有一个contextmenu，我想将ContextMenu父级作为CommandParameter传递-即目前右键单击的TreeViewItem所有者，有没有办法做到这一点？
这里是我的模板：

i have a HierarchicalDataTemplate for a TreeViewItem, in the template i have a contextmenu and i want to pass as CommandParameter the ContextMenu parent - i.e the TreeViewItem owner that was right clicked at the moment, is there a way to do that? here is my template:

    <HierarchicalDataTemplate 
    x:Key="ServerTemplate"
    DataType="{x:Type models:Server}" 
    ItemsSource="{Binding Channels}"
    ItemTemplate="{StaticResource ChannelTemplate}">
    <StackPanel
        Tag="{Binding DataContext,RelativeSource={RelativeSource Mode=FindAncestor,AncestorType={x:Type Window}}}"
        Orientation="Horizontal">
        <StackPanel.ContextMenu>
            <ContextMenu
                FontSize="14"
                FontFamily="Arial">
                <MenuItem 
                    Header="{x:Static p:Resources.ServerOperations_CommunicationSettings}"
                    Command="{Binding PlacementTarget.Tag.ServerCommunicationSettingCommand, RelativeSource={RelativeSource Mode=FindAncestor,AncestorType={x:Type ContextMenu}}}"
                    CommandParameter="{Binding Path=Parent, RelativeSource={RelativeSource Mode=Self}}">
                </MenuItem>

            </ContextMenu>
        </StackPanel.ContextMenu>
        <Image 
            Source="{Binding ImageURL, Converter={StaticResource StringToImageConverter}}"
            Margin="0,0,2,0"
            Height="25"
            Width="25"/>
        <TextBlock 
            Text="{Binding ServerName}"
            Foreground="White"/>
    </StackPanel>
</HierarchicalDataTemplate>

感谢帮助

推荐答案

您可以通过获取ContextMenu的 PlacementTarget 来获取TreeViewItem，该菜单将为 StackPanel 及其 TemplatedParent 将为 ContentPresenter ，其 TemplatedParent 将为 TreeViewItem 。这样就可以了：

You can get the TreeViewItem by getting PlacementTarget of ContextMenu which will be StackPanel and its TemplatedParent will be ContentPresenter and its TemplatedParent will be TreeViewItem. So this will work:

CommandParameter="{Binding Path=PlacementTarget.TemplatedParent.TemplatedParent, 
                           RelativeSource={RelativeSource Mode=FindAncestor,
                                            AncestorType={x:Type ContextMenu}}}"

PlacementTarget（StackPanel）-> TemplatedParent（ContentPresenter）-> TemplatedParent（TreeViewItem）

将UI组件传递给ViewModel并不是一个好主意。您应该传递数据，例如TreeViewItem的DataContext，因为您可以随时使用它。

Ideally it's not a good idea to pass UI components to ViewModel. You should pass data i.e. DataContext of TreeViewItem as you can always play with that.

如果您想传递 Server 实例，即TreeviewItem的 DataContext ，您只需执行 {Binding} MenuItem将从StackPanel继承它。

In case you want to pass Server instance i.e. DataContext of TreeviewItem, you can simply do "{Binding}" since MenuItem will inherit it from StackPanel.

CommandParameter="{Binding}"

这篇关于将contextmenu父级作为CommandParameter传递的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！