如何正确绑定子UserControl依赖属性的共享属性

我有4个不同的收藏。目前我显示了这4个集合,但一次只能选择一个元素。

显示4个集合的视图:

<usercontrol x:class=“xxx.yyy.vvv.menu”
xmlns=“http://schemas.microsoft.com/winfx/2006/xaml/presentation”
xmlns:x=“http://schemas.microsoft.com/winfx/2006/xaml”
xmlns:mc=“http://schemas.openxmlformats.org/markup-compatibility/2006”
xmlns:d=“http://schemas.microsoft.com/expression/blend/2008”
xmlns:local=“clr命名空间:xxx.yyy.vvv.menu”
mc:ignorable=“d”
d:designheight=“800”d:designwidth=“450”>
<grid name=“rootcontainer”>
<grid.dataContext>
<local:菜单视图模型/>
</grid.dataContext>
<itemsControl itemssource=“绑定集合”>
<itemsControl.itemTemplate>
<数据模板>
<local:collectioncontrol collection=“binding”selectedElement=“binding path=dataContext.globalSelectedElement,elementName=rootContainer,mode=twoway,updateSourceTrigger=propertyChanged”/>gt;
</datatemplate>
</itemscontrol.itemstemplate>
<itemscontrol.itemspanel>
<项模板lt;itemspaneltemplate>
<stackpanel orientation=“垂直”/>
</itemspaneltemplate>
</itemscontrol.itemspanel>
</itemscontrol>
</grid>
</usercontrol>
这已绑定到ViewModel:。

public class menuview model:somebaseview model that handlethenotify
{
公共imyelement globalselectedelement
{
get=>获取值<imyelement>();
set=>set value(value);//我从没来过这里!!!)
}
公共SomeCollectionContainer集合
{
get=>获取值<someCollectionContainer>();
set=>设置值(value);
}
}
我的子控件具有依赖项属性,当UserControl的内部ViewModel更改时,该属性会更改。


public imyelement selectedElement
{
get返回(imyelement)getvalue(selectedelementproperty);
set set value(selectedelementproperty,value);/*我来了!*/}
}
公共静态只读DependencyProperty SelectedElementProperty=
dependencyProperty.register(“selectedElement”,typeof(imyelement),typeof(collectioncontrol),new propertymetadata(null,onselectedElementChanged));

私有静态void OnSelectedElementChanged(DependencyObject DependencyObject,DependencyPropertyChangedEventArgs DependencyPropertyChangedEventArgs)
{
//检索子控件viewModel并设置属性
SubControlView模型SubControlView模型=(SubControlView模型)((CollectionControl)DependencyObject).rootContainer.dataContext;
SubControlViewModel.SelectedElement=(imYelement)DependencyPropertiesChangedEventArgs.NewValue;
}

//在构造函数中,我注册到ViewModel的PropertyChanged,并在其更改时设置SelectedElement。
因此,基本上,我加入了UserControl的Dependency属性的setValue,但我从来没有加入过我的主ViewModel的globalSelectedElementproperty。


我错过了什么?


编辑
我试图在我的ViewModel和Dependency属性之间直接使用双向绑定,但也不起作用:


在我的子控件中:

<usercontrol x:class=“xxx.yyy.vvv.collectioncontrol”
xmlns=“http://schemas.microsoft.com/winfx/2006/xaml/presentation”
xmlns:x=“http://schemas.microsoft.com/winfx/2006/xaml”
xmlns:mc=“http://schemas.openxmlformats.org/markup-compatibility/2006”
xmlns:d=“http://schemas.microsoft.com/expression/blend/2008”
xmlns:local=“clr命名空间:xxx.yyy.vvv.menu”
mc:ignorable=“d”
d:designheight=“450”d:designwidth=“800”>
<stackpanel name=“rootcontainer”orientation=“垂直”>
<stackpanel.dataContext>
<local:集合控件视图模型/>
</stackpanel.datacontext>
<label content=“绑定集合.名称”margin=“5,0,0,0”/>gt;
<listbox itemssource=“binding collection.items”HorizontalContentAlignment=“Stretch”padding=“0”borderThickness=“0”selectedItem=“binding selectedElement,relativesource=relativesource ancestorType=x:type local:collectionControl,mode=twoway”>
<listbox.itemtemplate>
<数据模板>
……
</datatemplate>
</listbox.itemtemplate>
<listbox.itemspanel>
<项模板lt;itemspaneltemplate>
<stackpanel orientation=“垂直”/>
</itemspaneltemplate>
</listbox.itemspanel>
</listbox>
</stackpanel>
</usercontrol>
我觉得我的用户控件依赖属性是从两个方面绑定的

我试着做一个小图表来展示我的课程。
因此,mycollectioncontrol.selectedElementare correctly set,but themenuView model.selectedItem.are not.


=

<UserControl x:Class="xxx.yyy.vvv.Menu"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             xmlns:local="clr-namespace:xxx.yyy.vvv.Menu"
             mc:Ignorable="d" 
             d:DesignHeight="800" d:DesignWidth="450">
    <Grid  Name="RootContainer">
        <Grid.DataContext>
            <local:MenuViewModel/>
        </Grid.DataContext>
        <ItemsControl ItemsSource="{Binding Collection}">
            <ItemsControl.ItemTemplate>
                <DataTemplate>
                    <local:CollectionControl Collection="{Binding}" SelectedElement="{Binding Path=DataContext.GlobalSelectedElement,ElementName=RootContainer, Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}"/>
                </DataTemplate>
            </ItemsControl.ItemTemplate>
            <ItemsControl.ItemsPanel>
                <ItemsPanelTemplate>
                    <StackPanel Orientation="Vertical" />
                </ItemsPanelTemplate>
            </ItemsControl.ItemsPanel>
        </ItemsControl>
    </Grid>
</UserControl>


它绑定到一个视图模型:

public class MenuViewModel : SomeBaseViewModelThatHandleTheNotify
{
    public IMyElement GlobalSelectedElement
    {
        get => GetValue<IMyElement>();
        set => SetValue(value); //I NEVER COME HERE!!!)
    }
    public SomeCollectionContainer Collection
    {
        get => GetValue<SomeCollectionContainer>();
        set => SetValue(value);
    }
}


我的子控件具有依赖项属性,当UserControl的内部ViewModel更改时,该属性会更改。

    public IMyElement SelectedElement
    {
        get { return (IMyElement)GetValue(SelectedElementProperty); }
        set { SetValue(SelectedElementProperty, value);/*HERE I COME!*/ }
    }
    public static readonly DependencyProperty SelectedElementProperty =
        DependencyProperty.Register("SelectedElement", typeof(IMyElement), typeof(CollectionControl), new PropertyMetadata(null, OnSelectedElementChanged));

    private static void OnSelectedElementChanged(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs dependencyPropertyChangedEventArgs)
    {
        //Retrieve the sub control ViewModel and set the property
        SubControlViewModel subControlViewModel = (SubControlViewModel)((CollectionControl)dependencyObject).RootContainer.DataContext;
        subControlViewModel.SelectedElement = (IMyElement)dependencyPropertyChangedEventArgs.NewValue;
    }

    //In the constructor, I register to PropertyChanged of the ViewModel, and I set the SelectedElement when it change.


所以,基本上,我输入了UserControl的Dependency属性的setValue,但我从未输入GlobalSelectedElement我的主视图模型的属性。

我错过了什么?

编辑
我试图直接在我的ViewModel和Dependency属性之间使用双向绑定,但也不起作用:

在我的子控件中:

<UserControl x:Class="xxx.yyy.vvv.CollectionControl"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             xmlns:local="clr-namespace:xxx.yyy.vvv.Menu"
             mc:Ignorable="d" 
             d:DesignHeight="450" d:DesignWidth="800">
    <StackPanel Name="RootContainer" Orientation="Vertical">
        <StackPanel.DataContext>
            <local:CollectionControlViewModel/>
        </StackPanel.DataContext>
        <Label Content="{Binding Collection.Name}" Margin="5,0,0,0" />
        <ListBox ItemsSource="{Binding Collection.Items}" HorizontalContentAlignment="Stretch" Padding="0" BorderThickness="0" SelectedItem="{Binding SelectedElement, RelativeSource={RelativeSource AncestorType={x:Type local:CollectionControl}}, Mode=TwoWay}">
            <ListBox.ItemTemplate>
                <DataTemplate>
                    ...
                </DataTemplate>
            </ListBox.ItemTemplate>
            <ListBox.ItemsPanel>
                <ItemsPanelTemplate>
                    <StackPanel Orientation="Vertical" />
                </ItemsPanelTemplate>
            </ListBox.ItemsPanel>
        </ListBox>
    </StackPanel>
</UserControl>


我觉得我的用户控件依赖属性是从两个方面绑定的

我试着做一个小图表来展示我的课程。
所以我的CollectionControl.SelectedElement设置正确,但MenuViewModel.SelectedItem不是。