protected virtual void OnCollectionChangingCancel(NotifyCollectionChangedCancelEventArgs e)
{
if (CollectionChangingCancel != null)
{
CollectionChangingCancel(this, e);
}
}
protected void BeginInsertItem(int index, ItemType item, out bool isCancel)
{
isCancel = false;
NotifyCollectionChangedCancelEventArgs e = new NotifyCollectionChangedCancelEventArgs(NotifyCollectionChangedAction.Add, item, index);
OnCollectionChangingCancel(e);
if (e.IsCancel)
{
isCancel = true;
return;
}
OnCollectionChanging(e);
m_IsBeginOperationExecuted = true;
}
protected void BeginRemoveItem(int index, out bool isCancel)
{
isCancel = false;
NotifyCollectionChangedCancelEventArgs e = new NotifyCollectionChangedCancelEventArgs(NotifyCollectionChangedAction.Remove, this[index], index);
OnCollectionChangingCancel(e);
if (e.IsCancel)
{
isCancel = true;
return;
}
OnCollectionChanging(e);
m_IsBeginOperationExecuted = true;
}