WPF中如何在XAML实现嵌套ObservableCollection的绑定？

问题场景 #

本人从事自动化领域工作，刚接触XAML，需要实现以下功能：左侧ListView展示PLC列表，点击任意PLC项后，右侧ListView显示该PLC对应的Tag集合。目前卡在XAML绑定嵌套ObservableCollection的环节，原代码中标记了困惑区域（标注为!Can't Figure this out!），优先希望通过XAML实现绑定，若无法实现再考虑后台代码方案。

相关类定义 #

PLC类 #

public class PLC
{
    public string Name { get; set; }
    public ObservableCollection<Tag> Tags { get; set; }
    public PLC(string name)
    {
        Name = name;
        Tags = new ObservableCollection<Tag>();
    }
    public override string ToString()
    {
        return Name;
    }
}

Tag类 #

点击PLC项时，右侧ListView需显示该PLC关联的Tag：

public class Tag
{
    public Tag(string name, int value)
    {
        Name = name;
        Value = value;
    }
    public string Name { get; set; }
    public int Value { get; set; }
}

原XAML代码（存在绑定困惑） #

此为绑定到父ViewModel的用户控件：

<UserControl x:Class="Test.UserControls.RuntimeControl"
             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" 
             mc:Ignorable="d" 
             d:DesignHeight="450" d:DesignWidth="800">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="20"></RowDefinition>
            <RowDefinition Height="*"></RowDefinition>
        </Grid.RowDefinitions>
        <Grid Grid.Row="0">
            <TextBlock Foreground="Red" Margin="10,0,0,0" >Runtime</TextBlock>
        </Grid>
        <Grid Grid.Row="1">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="*"></ColumnDefinition>
                <ColumnDefinition Width="*"></ColumnDefinition>
            </Grid.ColumnDefinitions>
            <ListView x:Name="PLCLV" Grid.Column="0" Margin="10" FontSize="25" SelectionMode="Single" ScrollViewer.VerticalScrollBarVisibility="Visible"
                      BorderThickness="0" ItemsSource="{Binding PLCs}">
                <ListView.ItemTemplate>
                    <DataTemplate>
                        <TextBlock Text="{Binding Name}"></TextBlock>
                    </DataTemplate>
                </ListView.ItemTemplate>
            </ListView>
            <ListView Grid.Column="1" Margin="10" FontSize="25" AlternationCount="2" ScrollViewer.VerticalScrollBarVisibility="Visible"
                      BorderThickness="0 " ItemsSource=***!Can't Figure this out!***>
                <ListView.ItemContainerStyle>
                    <Style TargetType="ListViewItem">
                        <Setter Property="Focusable" Value="false"/>
                    </Style>
                </ListView.ItemContainerStyle>
                <ListView.ItemTemplate>
                    <DataTemplate>
                        <TextBlock>
                            <Run Text = "Name: "/>
                            <Run Text =***!Can't Figure this out!***
                            <Run Text ="Value: "/>
                            <Run Text =***!Can't Figure this out!***
                        </TextBlock>
                    </DataTemplate>
                </ListView.ItemTemplate>
            </ListView>
        </Grid>
    </Grid>
</UserControl>

修复后的XAML方案 #

核心绑定修改 #

右侧ListView的绑定可直接通过XAML实现，无需后台代码：

<ListView Grid.Column="1" Margin="10" FontSize="25" 
          DataContext="{Binding SelectedItem, ElementName=PLCLV}" 
          ItemsSource="{Binding Tags}">
    <ListView.ItemContainerStyle>
        <Style TargetType="ListViewItem">
            <Setter Property="Focusable" Value="false"/>
        </Style>
    </ListView.ItemContainerStyle>
    <ListView.ItemTemplate>
        <DataTemplate>
            <TextBlock>
                <Run Text="Name: "/>
                <Run Text="{Binding Name}"/>
                <Run Text="  Value: "/>
                <Run Text="{Binding Value}"/>
            </TextBlock>
        </DataTemplate>
    </ListView.ItemTemplate>
</ListView>

逻辑说明 #

1. 右侧ListView通过DataContext="{Binding SelectedItem, ElementName=PLCLV}"绑定左侧PLC列表的选中项，将自身数据上下文切换为当前选中的PLC对象。
2. 通过ItemsSource="{Binding Tags}"绑定该PLC对象的Tags集合，自动展示对应Tag列表。
3. 在ItemTemplate中，通过{Binding Name}和{Binding Value}分别绑定Tag的名称和数值。

内容的提问来源于stack exchange，提问作者captcpsc