C# 正在设置在Window.Resources中声明为静态资源的MenuItem的DataContext
我有这个上下文菜单,我在我的树视图的不同数据模板上使用它C# 正在设置在Window.Resources中声明为静态资源的MenuItem的DataContext,c#,wpf,xaml,datacontext,menuitem,C#,Wpf,Xaml,Datacontext,Menuitem,我有这个上下文菜单,我在我的树视图的不同数据模板上使用它 <Window.Resources> <ContextMenu x:Key="mnuContextTreeView"> <ContextMenu.ItemsSource> <CompositeCollection> <CollectionContainer Collection="{StaticResour
<Window.Resources>
<ContextMenu x:Key="mnuContextTreeView">
<ContextMenu.ItemsSource>
<CompositeCollection>
<CollectionContainer Collection="{StaticResource mnuRun}" />
<Separator />
<CollectionContainer Collection="{StaticResource mnuResults}" />
<Separator />
<MenuItem Name="mnuFlagContext" Command="local:MainWindow.MarkFlagged"
DataContext="" Visibility="{Binding Path=Flagged, Mode=OneWay,
Converter={StaticResource boolToCollapsedVisibilityConverter}}" />
<!-- I would like to set the DataContext of this one, so it could
be hidden based on a property of the underlying ItemGroup or
ItemType in the TreeView -->
<CollectionContainer Collection="{StaticResource mnuStandardEdit}" />
</CompositeCollection>
</ContextMenu.ItemsSource>
</ContextMenu>
</Window.Resources>
使用上述关联菜单的TreeView:
<TreeView Name="myTreeView" DataContext="{Binding ElementName=mainWindow,
Path=RootElement}" ItemsSource="{Binding}">
<TreeView.Resources>
<HierarchicalDataTemplate DataType="{x:Type logic:ItemGroup}"
ItemsSource="{Binding Children}">
<TextBlock Text="{Binding Name}" Foreground="Blue"
ContextMenu="{Binding Source={StaticResource mnuContextTreeView}}" />
</HierarchicalDataTemplate>
<HierarchicalDataTemplate DataType="{x:Type logic:ItemType}">
<TextBlock Text="{Binding Name}" Foreground="Red"
ContextMenu="{Binding Source={StaticResource mnuContextTreeView}}" />
</HierarchicalDataTemplate>
</TreeView.Resources>
</TreeView>
如何设置名为mnuFlagContext的MenuItem的DataContext,以便根据树视图中基础ItemGroup或ItemType的属性将其隐藏?通过以下方法解决该问题(最终绑定的是标题而不是可见性,但与解决方案无关): 1) 将菜单分离为单独的静态资源:
<collections:ArrayList x:Key="mnuToggleFlag" x:Shared="False">
<MenuItem Command="local:MainWindow.ToggleFlag"
Header="{Binding Path=Flagged, Mode=OneWay,
Converter={StaticResource flaggedToHeaderConverter}}" />
</collections:ArrayList>
因此,如果要求获取
标记的属性,该属性可从treevieItem
的DataContext
到ContextMenu中的MenuItem.Header
您可以尝试:
<ContextMenu x:Key="mnuContextTreeView"
DataContext="{Binding RelativeSource={RelativeSource Self},
Path=PlacementTarget.DataContext}">
<ContextMenu.ItemsSource>
<CompositeCollection>
<CollectionContainer Collection="{StaticResource mnuRun}" />
<Separator />
<CollectionContainer Collection="{StaticResource mnuResults}" />
<Separator />
<MenuItem Header="{Binding Path=Flagged,
Mode=OneWay,
Converter={StaticResource flaggedToHeaderConverter}}"
Command="local:MainWindow.MarkFlagged" />
<CollectionContainer Collection="{StaticResource mnuStandardEdit}" />
</CompositeCollection>
</ContextMenu.ItemsSource>
</ContextMenu>
很抱歉,这看起来很奇怪,我真的不会向任何人推荐这种方法。如果它对您有效,但对任何未来的读者来说都是很好的,我建议使用ContextMenu
的PlacementTarget
属性来提取TreeView
的DataContext
,然后将其传递到MenuItem
当然,但我不确定是否正确遵循了您的所有要求。我的理解是,您有两个层次数据模板
,其中两个都使用相同的上下文菜单
,但是如果父项是特定的数据类型
,您希望其中的菜单项
隐藏/折叠。这是正确的吗?是的,或者更准确地说(在我的原始帖子之后更改)绑定MenuItem的标题,而不是可见性。并且,标记的位置是,它在树视图项的DataContext
中吗?ItemGroup和ItemType对象有一个公共基类(称为ItemBase),ItemBase有一个名为Flag的布尔属性。
((MenuItem)((ArrayList)Resources["mnuToggleFlag"])[0]).DataContext = _actualItem;
<ContextMenu x:Key="mnuContextTreeView"
DataContext="{Binding RelativeSource={RelativeSource Self},
Path=PlacementTarget.DataContext}">
<ContextMenu.ItemsSource>
<CompositeCollection>
<CollectionContainer Collection="{StaticResource mnuRun}" />
<Separator />
<CollectionContainer Collection="{StaticResource mnuResults}" />
<Separator />
<MenuItem Header="{Binding Path=Flagged,
Mode=OneWay,
Converter={StaticResource flaggedToHeaderConverter}}"
Command="local:MainWindow.MarkFlagged" />
<CollectionContainer Collection="{StaticResource mnuStandardEdit}" />
</CompositeCollection>
</ContextMenu.ItemsSource>
</ContextMenu>
<TreeView Name="myTreeView" DataContext="{Binding ElementName=mainWindow,
Path=RootElement}" ItemsSource="{Binding}">
<TreeView.Resources>
<HierarchicalDataTemplate DataType="{x:Type logic:ItemGroup}"
ItemsSource="{Binding Children}">
<TextBlock Text="{Binding Name}" Foreground="Blue"
ContextMenu="{Binding Source={StaticResource mnuContextTreeView}}" />
</HierarchicalDataTemplate>
<HierarchicalDataTemplate DataType="{x:Type logic:ItemType}">
<TextBlock Text="{Binding Name}" Foreground="Red"
ContextMenu="{Binding Source={StaticResource mnuContextTreeView}}" />
</HierarchicalDataTemplate>
</TreeView.Resources>
</TreeView>