public List <Person> AddPersons(List <Person> updatedPersons)
{
var isUpdated = false;
List <Person> response;
lock (Persons)
{
response = Persons.Except(updatedPersons).ToList();
foreach (var person in updatedPersons)
{
var p = Persons.FirstOrDefault(p1 => p1.Id == person.Id);
if (p == null)
{
Persons.Add(person.Copy());
isUpdated = true;
}
else if (p.IsRemoved == false && person.IsRemoved)
{
p.IsRemoved = true;
}
}
if (isUpdated)
{
Persons.Sort((p1, p2) => p1.Id.CompareTo(p2.Id));
PersonCount = Persons.Count;
}
}
return(response);
}
