设置在windows . resources中声明为静态资源的菜单项的DataContext

本文关键字：资源 静态 菜单项 DataContext 声明 windows resources 设置 | 更新日期: 2023-09-27 18:17:54

我有这个上下文菜单，我在我的TreeView的不同datatemplate中使用。

<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>

使用上述上下文菜单的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>

我怎么能设置一个名为mnuFlagContext的菜单项的数据上下文，这样它就可以隐藏基于底层ItemGroup或ItemType在TreeView的属性?

设置在windows . resources中声明为静态资源的菜单项的DataContext

如果要求获得Flagged属性可以从TreeViewItem的DataContext到ContextMenu的MenuItem.Header

你可以试试:

<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>

，没有改变原来的TreeView部分

<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>

设法用以下方法解决它(最终头被绑定而不是可见性，但与解决方案无关):

1)将菜单分隔为单独的静态资源:

    <collections:ArrayList x:Key="mnuToggleFlag" x:Shared="False">
        <MenuItem Command="local:MainWindow.ToggleFlag" 
            Header="{Binding Path=Flagged, Mode=OneWay, 
            Converter={StaticResource flaggedToHeaderConverter}}" />
    </collections:ArrayList>
2)从ContextMenu中引用它: 
<ContextMenu x:Key="mnuContextTreeView">
    <ContextMenu.ItemsSource>
        <CompositeCollection>
            <CollectionContainer Collection="{StaticResource mnuRun}" />
            <Separator />
            <CollectionContainer Collection="{StaticResource mnuResults}" />
            <Separator />
            <!-- Below is the reference for the new static resource -->
            <CollectionContainer Collection="{StaticResource mnuToggleFlag}" />
            <CollectionContainer Collection="{StaticResource mnuStandardEdit}" />
        </CompositeCollection>
    </ContextMenu.ItemsSource>
</ContextMenu>

3)从后面的代码设置DataContext:

((MenuItem)((ArrayList)Resources["mnuToggleFlag"])[0]).DataContext = _actualItem;
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