NullableToBoolConverter.cs

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using System.Globalization;
using System.Windows.Data;
 
namespace Dreamine.UI.Wpf.Converters;

public class NullableToBoolConverter: IValueConverter
{
    public bool Invert { get; set; } = false;

    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        bool result = value == null;
        return Invert ? !result : result;
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        return Binding.DoNothing;
    }
}