private void SetHelper(uint index, T value)
{
if (_listChanging != null)
{
CallListChanging(new ListChangeInfo <T>(NotifyCollectionChangedAction.Replace, (int)index, 0, ListExt.Single(value)));
}
++_version;
if (_root.IsFrozen)
{
AutoCreateOrCloneRoot();
}
_root.SetAt(index, value, _observer);
CheckPoint();
}
public sealed override void Insert(int index, T item)
{
if ((uint)index > (uint)_count)
{
throw new IndexOutOfRangeException();
}
DetectSizeOverflow(1);
AutoThrow();
if (_listChanging != null)
{
CallListChanging(new ListChangeInfo <T>(NotifyCollectionChangedAction.Add, index, 1, ListExt.Single(item)));
}
try {
_freezeMode = FrozenForConcurrency;
if (_root == null || _root.IsFrozen)
{
AutoCreateOrCloneRoot();
}
AListNode <int, T> splitLeft, splitRight;
splitLeft = _root.Insert((uint)index, item, out splitRight, _observer);
if (splitLeft != null) // redundant 'if' optimization
{
AutoSplit(splitLeft, splitRight);
}
++_version;
Debug.Assert(_count != int.MaxValue);
++_count;
CheckPoint();
} finally {
_freezeMode = NotFrozen;
}
}