private void CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
var added = e.NewItems != null ? e.NewItems[0] as TwitterAccount : null;
var removed = e.OldItems != null ? e.OldItems[0] as TwitterAccount : null;
switch (e.Action)
{
case NotifyCollectionChangedAction.Add:
if (added == null)
{
throw new ArgumentException("added item is null.");
}
_accountCache[added.Id] = added;
Task.Run(() => AddAccountSub(added.Id));
break;
case NotifyCollectionChangedAction.Remove:
if (removed == null)
{
throw new ArgumentException("removed item is null.");
}
TwitterAccount removal;
_accountCache.TryRemove(removed.Id, out removal);
Task.Run(() => RemoveAccountSub(removed.Id));
break;
case NotifyCollectionChangedAction.Replace:
if (added == null)
{
throw new ArgumentException("added item is null.");
}
if (removed == null)
{
throw new ArgumentException("removed item is null.");
}
_accountCache[added.Id] = added;
TwitterAccount replacee;
_accountCache.TryRemove(removed.Id, out replacee);
Task.Run(() => AddAccountSub(added.Id));
Task.Run(() => RemoveAccountSub(removed.Id));
break;
case NotifyCollectionChangedAction.Reset:
_accountCache.Clear();
_accountObservableCollection.ForEach(a => _accountCache[a.Id] = a);
Task.Run(() => AccountProxy.RemoveAllAccountsAsync());
break;
}
_settingItem.Value = _accountObservableCollection.ToList();
}