Artifact ceba0ff37313019251857f9d03c6b5117509a5dea32248868be1e9e6bd3e0eab:

• File PointlessWaymarks.WpfCommon/ValueConverters/NullImageConverter.cs — part of check-in [2ca094c9fe] at 2024-06-07 03:18:35 on branch main — 1st Commit Trying Out a Common Library Intent for now is as a submodule. (user: charles@cmiles.info size: 1025)

using System.Globalization;
using System.Windows;
using System.Windows.Data;

namespace PointlessWaymarks.WpfCommon.ValueConverters;

//https://stackoverflow.com/questions/5399601/imagesourceconverter-error-for-source-null
public class NullImageConverter : IValueConverter
{
    public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
    {
        if (value == null)
            return DependencyProperty.UnsetValue;
        return value;
    }

    public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
    {
        // According to https://msdn.microsoft.com/en-us/library/system.windows.data.ivalueconverter.convertback(v=vs.110).aspx#Anchor_1
        // (kudos Scott Chamberlain), if you do not support a conversion 
        // back you should return a Binding.DoNothing or a 
        // DependencyProperty.UnsetValue
        return Binding.DoNothing;
        // Original code:
        // throw new NotImplementedException();
    }
}