ToBase64.cs

using System;
using System.Globalization;
using System.Windows.Data;
using System.Windows.Markup;
 
namespace LegalLab.Converters
{
    public class ToBase64 : MarkupExtension, IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (value is byte[] Bin)
                return System.Convert.ToBase64String(Bin);
            else
                return value.ToString();
        }
 
        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            return value;
        }
 
        public override object ProvideValue(IServiceProvider serviceProvider)
        {
            return this;
        }
    }
}