【wpf】ListBoxItemIndexConverter转换器listbox序号自更新

public class ListBoxItemIndexConverter : IMultiValueConverter
{
    public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
    {
        string indexPrefix = null;
        if (parameter != null && parameter is string indexPrefixPara)
        {
            indexPrefix = ResourceHelper.GetResource<string>(indexPrefixPara);
        }
        if (values == null || values.Length < 2)
            return $"{indexPrefix}1";
        if (values[0] is ListBoxItem listBoxItem)
        {
            var listView = ItemsControl.ItemsControlFromItemContainer(listBoxItem) as ListBox;
            if (listView == null)
                return $"{indexPrefix}1";
            var index = 0;
            if (values.Length >= 3 && values[2] != null && int.TryParse(values[2].ToString(), out var i))
                index = listView.ItemContainerGenerator.IndexFromContainer(listBoxItem) + 1;
            else
                index = listView.ItemContainerGenerator.IndexFromContainer(listBoxItem) + 1;
            return $"{indexPrefix}{index}";
        }
        return $"{indexPrefix}1";
    }

    public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
    {
        throw new NotImplementedException();
    }
}

 使用示例：

<TextBlock>
    <TextBlock.Text>
        <!--ConverterParameter传参前缀，可省略-->
        <MultiBinding Converter="{StaticResource ListBoxItemIndexConverter}" 
                      ConverterParameter="序号">
            <Binding RelativeSource="{RelativeSource Mode=FindAncestor,AncestorType={x:Type ListBoxItem}}"/>
            <!--控制是否更新-->
            <Binding Path="IsUpdateIndex" Mode="TwoWay"/>
            <!--控制从哪个序号开始，可省略-->
            <Binding Path="StartIndex" Mode="TwoWay"/>
        </MultiBinding>
    </TextBlock.Text>
</TextBlock>