我想根据ViewModel中的数据动态创建Hierarchical ContextMenu。
在ViewMode中,我定义了ContextMenuAction:
public class ContextMenuAction : ViewModelBase
{
public string Header { get; set; }
public ICommand Action { get; set; }
public Brush Icon { get; set; }
public ObservableCollection<ContextMenuAction> SubActions { get; set; } = new ObservableCollection<ContextMenuAction>();
}
在 View 中:
<ContextMenu ItemsSource="{Binding Path=PlacementTarget.Tag.Actions, RelativeSource={RelativeSource Self}}">
<ContextMenu.ItemTemplate >
<DataTemplate DataType="MenuItem">
<MenuItem/>
</DataTemplate>
</ContextMenu.ItemTemplate>
<ContextMenu.ItemContainerStyle>
<Style TargetType="MenuItem">
<Setter Property="ItemsSource" Value="{Binding SubActions}"/>
<Setter Property="Header" Value="{Binding Header}" />
<Setter Property="Command" Value="{Binding Action}"/>
</Style>
</ContextMenu.ItemContainerStyle>
结果是,上下文菜单中没有文本。
我已经检查了输出窗口以检查绑定(bind),所有绑定(bind)都正常工作,没有异常(exception)。
请帮助我找出原因,在此先感谢!
最佳答案
您应该定义一个HierarchicalDataTemplate
:
<ContextMenu ItemsSource="{Binding Path=PlacementTarget.Tag.Actions, RelativeSource={RelativeSource Self}}">
<ContextMenu.ItemTemplate>
<HierarchicalDataTemplate DataType="{x:Type local:ContextMenuAction}" ItemsSource="{Binding SubActions}">
<TextBlock Text="{Binding Header}" />
</HierarchicalDataTemplate>
</ContextMenu.ItemTemplate>
<ContextMenu.ItemContainerStyle>
<Style TargetType="MenuItem">
<Setter Property="Command" Value="{Binding Action}"/>
</Style>
</ContextMenu.ItemContainerStyle>
</ContextMenu>
关于c# - 动态创建分层ContextMenu MVVM,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/45024658/