Question

我有以下控件：

<UserControl x:Class="DNC_v3_0_Admin.Controls.FilterableTreeViewControl"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:Controls="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls" 
    xmlns:Converters="clr-namespace:DNC_v3_0_Admin.Converters" 
    xmlns:Data="clr-namespace:System.Windows;assembly=System.Windows.Controls"
    xmlns:controlsInputToolkit="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Input.Toolkit"
    mc:Ignorable="d"
    d:DesignHeight="300" d:DesignWidth="400" xmlns:my="clr-namespace:DNC_v3_0_Admin.Controls"
    x:Name="MyFilterableTreeViewControl">

    <UserControl.Resources>
        <ImageBrush x:Key="PropertiesBrush" ImageSource="../Resources/machine.png"/>
        <Converters:ManagedObjectNodeIconConverter x:Key="TreeIconConverter"/>
        <Data:HierarchicalDataTemplate x:Key="FilterableTreeViewTemplate" ItemsSource="{Binding Children}">
            <StackPanel Orientation="Horizontal" Height="Auto" Width="Auto" Grid.Row="0">
                <Image Source="{Binding NodeType,Converter={StaticResource TreeIconConverter}}"/>
                <TextBlock x:Name="NameTextBlock" Text="{Binding Name}" controlsInputToolkit:ContextMenuService.ContextMenu="{Binding ElementName=MyFilterableTreeViewControl, Path=ContextMenu, Mode=TwoWay}" />
            </StackPanel>
        </Data:HierarchicalDataTemplate>
    </UserControl.Resources>

    <Grid x:Name="LayoutRoot" Background="White">
        <Controls:TreeView Name="treeView" Style="{StaticResource MachineGroupStyle}" ItemsSource="{Binding ElementName=MyFilterableTreeViewControl, Path=ItemsSource}" SelectedItemChanged="treeView_SelectedItemChanged" />
    </Grid>
</UserControl>

背后的代码：

    public ContextMenu ContextMenu {
        get {
            return ( ContextMenu )GetValue( ContextMenuProperty );
        }
        set {
            SetValue( ContextMenuProperty, value );
        }
    }

    public static readonly DependencyProperty ContextMenuProperty =
        DependencyProperty.Register( "ContextMenu", typeof( ContextMenu ), typeof( FilterableTreeViewControl ),
        new PropertyMetadata( null, new PropertyChangedCallback( FilterableTreeViewControl.OnContextMenuPropertyChange ) ) );

    private static void OnContextMenuPropertyChange( DependencyObject d, DependencyPropertyChangedEventArgs e ) {
        FilterableTreeViewControl ctrl = d as FilterableTreeViewControl;
        ctrl.OnContextMenuChange( ( ContextMenu )e.NewValue );
    }

    protected virtual void OnContextMenuChange( ContextMenu NewContextMenu ) {
        //ContextMenu = NewContextMenu;
    }

用法：

        <my:FilterableTreeViewControl x:Name="machineGroupTreeView" Grid.Row="0" Grid.Column="0" ItemsSource="{Binding TreeRootNodes}" FilterCaption="Filter:" SelectedItemChanged="machineGroupTreeView_SelectedItemChanged" >
            <my:FilterableTreeViewControl.ContextMenu>
                <controlsInputToolkit:ContextMenu>
                    <controlsInputToolkit:MenuItem Header="New" Command="{Binding NewCommand}" CommandParameter="{Binding Id}" >
                        <controlsInputToolkit:MenuItem.Icon>
                            <Rectangle Width="16" Height="16" Fill="{StaticResource PropertiesBrush}"/>
                        </controlsInputToolkit:MenuItem.Icon>
                    </controlsInputToolkit:MenuItem>
                </controlsInputToolkit:ContextMenu>
            </my:FilterableTreeViewControl.ContextMenu>
        </my:FilterableTreeViewControl>

但是上下文菜单没有出现。有什么想法吗？

Answer 1

很难回答你的问题，因为你的代码中有很多无关紧要的东西。尝试剥离代码，使其只包含不起作用的部分！

无论如何，我在你的代码隐藏中发现了一些错误。您已经定义了一个依赖项属性，您可以在其中处理其已更改在事件处理程序中，将依赖项属性设置为新值。这完全没必要！此时依赖项属性已设置为新值，您无需处理更改事件即可实现此目的。

Answer 2

我将ContextMenu属性更改为

public ObservableCollection<MenuItem> ContextMenu {
    get {
        return ( ObservableCollection<MenuItem> )GetValue( TreeContextMenuProperty );
    }
    set {
        SetValue( TreeContextMenuProperty, value );
    }
}

以及其他一切相应的，现在工作正常。

UserControl ContextMenu绑定问题

2 个答案: