C# 获取IitemControl中的项，IitemControl是另一个ItemControl

我有个问题我有一个简单的WPF项目列表：

    <ItemsControl ItemsSource="{Binding Details.ModuleFunStateInRack}" x:Name="ModuleFunStateInRackRoot">
        <ItemsControl.ItemTemplate>
            <DataTemplate>
                <StackPanel Orientation="Vertical">
                    <ItemsControl ItemsSource="{Binding ModuleFunState}" x:Name="ModuleFunStateRoot">
                        <ItemsControl.ItemTemplate>
                            <DataTemplate>
                                <StackPanel Orientation="Vertical">
                                    <StackPanel Orientation="Horizontal">
                                        <Label Content="Module Functional State Id: "/>
                                        <TextBlock VerticalAlignment="Center" >
                                            <TextBlock.Text>
                                                <Binding>
                                                    <Binding.Converter>
                                                        <helpers:ItemIndexConverter DataContext="{Binding Source={x:Reference ModuleFunStateRoot},Path=(ItemsControl.ItemsSource)}" />
                                                    </Binding.Converter>
                                                </Binding>
                                            </TextBlock.Text>
                                        </TextBlock>
                                    </StackPanel>>
                                </StackPanel>
                            </DataTemplate>
                        </ItemsControl.ItemTemplate>
                    </ItemsControl>
                </StackPanel>
            </DataTemplate>
        </ItemsControl.ItemTemplate>
    </ItemsControl>

问题是，当我在内部ItemControl上使用此帮助程序时，我发现他找不到名为ModuleFunStateRoot name的元素。是否有一个我复制并传递的元素，以确保引用标记，但当我在OutermorModuleFunStateInTrackRoot ItemControl上使用此帮助程序时，它工作正常。可能有什么问题？

您可以使用和IMultiValueConverter并绑定到ItemsSource和当前项：

public sealed class ItemIndexConverter : IMultiValueConverter
{
    public object Convert(object[] dataItems, Type targetType, object props, CultureInfo _) => 
        ((IList)dataItems[1]).IndexOf(dataItems[0]).ToString();

    public object[] ConvertBack(object value, Type[] targetTypes, object props, CultureInfo _) =>
        throw new NotImplementedException();
}

XAML：

---

能否显示用于在内部ItemsControl上使用助手的代码行？请注意，DataTemplate有自己的名称作用域，这使得ModuleFunStateRoot名称在其作用域之外未定义。

public sealed class ItemIndexConverter : IMultiValueConverter
{
    public object Convert(object[] dataItems, Type targetType, object props, CultureInfo _) => 
        ((IList)dataItems[1]).IndexOf(dataItems[0]).ToString();

    public object[] ConvertBack(object value, Type[] targetTypes, object props, CultureInfo _) =>
        throw new NotImplementedException();
}

<TextBlock VerticalAlignment="Center" >
    <TextBlock.Text>
        <MultiBinding>
            <MultiBinding.Converter>
                <helpers:ItemIndexConverter />
            </MultiBinding.Converter>
            <Binding />
            <Binding Path="ItemsSource" RelativeSource="{RelativeSource AncestorType=ItemsControl}" />
        </MultiBinding>
    </TextBlock.Text>
</TextBlock>