public string InsertOrUpdateContact(IContactInfo contact)
{
string result = contact.Key;
lock (_contacts)
{
var target = _contacts.FirstOrDefault(x => x.Key == contact.Key);
if (target == null)
{
target = ContactInfo.GetLocalObject(contact);
target.Key = Guid.NewGuid().ToString("D");
result = target.Key;
_contacts.Add(target);
}
else
{
_contacts.Remove(target);
_contacts.Add(ContactInfo.GetLocalObject(contact));
}
}
FlushDb();
return(result);
}