public ISet <IMethodChange> GetDifferences()
        {
            var differences = new HashSet <IMethodChange>();

            foreach (var previousMethod in PreviousType.Methods)
            {
                var currentMethod = CurrentType.Methods.FirstOrDefault(Predicate.For(previousMethod));
                if (currentMethod != null)
                {
                    var methodDifference = GetDifference(previousMethod, currentMethod);
                    if (methodDifference != null)
                    {
                        differences.Add(methodDifference);
                    }
                }
                else
                {
                    differences.AddMethod(previousMethod, Change.Deleted);
                }
            }

            GetAddedMethods().ToList().ForEach(m => differences.AddMethod(m, Change.Added));

            return(differences);
        }