我有“简单”的任务有一个文本菜单上一个TreeView(元素)在MVVM-方式进行。 当在网上搜索,我发现了一些解决方案,我可以把与按钮等,但不与TreeView的工作。 我认为这个问题是与设定的树视图的ItemsSource属性,它使每一个项目一个自己的DataContext。
这是我的小测试,应用,在那里你可以看到原理工作按钮,而不是TreeView的元素:
MainWindow.xaml:
<Window x:Class="ContextMenu.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525">
<Grid >
<StackPanel>
<TextBlock Text="{Binding MyText}" />
<Button Tag="{Binding DataContext,RelativeSource={RelativeSource Mode=Self}}" Content="Click me">
<Button.ContextMenu>
<ContextMenu>
<MenuItem Header="{Binding PlacementTarget.Tag.MyText,
RelativeSource={RelativeSource Mode=FindAncestor,AncestorType=ContextMenu}}" />
</ContextMenu>
</Button.ContextMenu>
</Button>
<TreeView ItemsSource="{Binding MyList}" Tag="{Binding DataContext, RelativeSource={RelativeSource Mode=Self}}">
<TreeView.ItemTemplate>
<HierarchicalDataTemplate>
<TextBlock Text="{Binding Name}">
<TextBlock.ContextMenu>
<ContextMenu>
<MenuItem Header="{Binding Path=PlacementTarget.Tag.MyText,
RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=ContextMenu}}" />
</ContextMenu>
</TextBlock.ContextMenu>
</TextBlock>
</HierarchicalDataTemplate>
</TreeView.ItemTemplate>
</TreeView>
</StackPanel>
</Grid>
</Window>
代码隐藏:
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
DataContext = new MainWindowVM();
}
}
MainWindowVM.cs:
public class MainWindowVM
{
public string MyText { get; set; }
public ObservableCollection<TreeElement> MyList { get; set; }
public MainWindowVM()
{
MyText = "This is my Text!";
MyList = new ObservableCollection<TreeElement>();
MyList.Add(new TreeElement("String 1"));
MyList.Add(new TreeElement("String 2"));
}
}
public class TreeElement
{
public string Name { get; set; }
public TreeElement(string Name)
{
this.Name = Name;
}
}
谢谢你的帮助!! 约尔格