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Editorial Team
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Asked: 2026-06-01T21:04:09+00:00

I’ve just recently started working on an app that displays a bunch of xml

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I’ve just recently started working on an app that displays a bunch of xml data in a listBox, but the problem is not every xml item has a child value (In my problem, upload), so its listBox code shouldn’t be displayed.

Example:

<item>
     <id>1</id>
     <body>Some text</body>
     <upload></upload>
     <created>Some text</created>
</item>

I’m getting the data and populating my list this way:

var data = from query in loadedData.Descendants("item")
                   select new droppedItem
                   {
                       Id = (int)query.Element("id"),
                       Body = (string)query.Element("body"),
                       Upload = (string)query.Element("upload"),
                       Created = (DateTime)ConvertFromUnixTimestamp((double)query.Element("created"))
                   };
        userDrops.ItemsSource = data;

And my xaml looks like:

<ListBox Margin="0,0,-12,0" Name="userDrops">
                <ListBox.ItemTemplate>
                    <DataTemplate>
                        <StackPanel Margin="0,0,0,17" Width="432">
                            <RichTextBox>
                                <Paragraph>
                                    <Run Text="{Binding Body}" FontSize="25" FontFamily="Segoe WP"></Run>
                                </Paragraph>
                                <Paragraph>
                                    <Hyperlink NavigateUri="{Binding Upload}" TargetName="_blank" FontSize="25" FontFamily="Segoe WP">{Binding Upload}</Hyperlink>
                                </Paragraph>
                                <Paragraph>
                                    <Run Text="{Binding Created}" FontFamily="Segoe WP SemiLight"></Run>
                                </Paragraph>
                            </RichTextBox>
                        </StackPanel>
                    </DataTemplate>
                </ListBox.ItemTemplate>
            </ListBox>

What I want to do is only display the paragraph holding the upload info if the xml upload child holds a value. Otherwise, just remove it from the listBox. I can’t figure out how to change the basic listBox template though.

Any help would be great!

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1 Answer

  1. Editorial Team

    How about using TextBlocks to display Body and Created? The middle part would be a RichTextBox, you can use a Visibility converter to toggle hide/show if Upload is empty.

    You need to include your converter in your xaml page first,

    xmlns:converters="clr-namespace:xxx.Converters;assembly=xxx"

<converters:VisibilityConverter x:Key="visibilityConverter" />

    then use it inside your template,

                    <StackPanel Margin="40,237,8,326" Width="432" Grid.Row="1"> 
                    <RichTextBox> 
                        <Paragraph> 
                            <Run Text="{Binding Body}" FontSize="25" FontFamily="Segoe WP"></Run> 
                        </Paragraph>
                    </RichTextBox> 
                    <RichTextBox Visibility="{Binding Upload, Converter={StaticResource VisibilityConverter}}">
                        <Paragraph> 
                            <Hyperlink NavigateUri="{Binding Upload}" TargetName="_blank" FontSize="25" FontFamily="Segoe WP">{Binding Upload}</Hyperlink> 
                        </Paragraph>
                    </RichTextBox> 
                        <TextBlock Text="{Binding Created}" FontFamily="Segoe WP SemiLight"/>
                </StackPanel>

    The converter should be something like this,

      public class VisibilityConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            bool visible = true;

            if (value is bool)
            {
                visible = (bool)value;
            }
            else if (value is int || value is short || value is long)
            {
                visible = 0 != (int)value;
            }
            else if (value is float || value is double)
            {
                visible = 0.0 != (double)value;
            }
            else if (value is string) {
                visible = ((string)value).Length > 0;
            }
            else if (value == null) {
                visible = false;
            }

            if ((string)parameter == "!")
            {
                visible = !visible;
            }

            return visible ? Visibility.Visible : Visibility.Collapsed;
        }

        public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }

    For more info regarding value converter, see this.

    UPDATE

    In your App.xaml, do this,

    <Application xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
             xmlns:sg="http://schemas.stargategroup.com.au/2010/xaml/presentation" 
             xmlns:converters="clr-namespace:xxx.Converters"
             x:Class="xxx.Application.App">

    <Application.Resources>
        <ResourceDictionary>
            <converters:VisibilityConverter x:Key="VisibilityConverter" />
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