ByteArrayToImageSourceConverter

ByteArrayToImageSourceConverter.cs

public class ByteArrayToImageSourceConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture) => 
        value == null ?
            null :
            ImageSource.FromStream(() => new MemoryStream((byte[])value));

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

View.xaml

<Image Source="{Binding Image, Converter={StaticResource ByteArrayToImageSourceConverter}}"/>