public void LockModifyChangeAction(CollectionChangeAction collectionChangeAction, object key)
{
if (key == null)
{
throw new ArgumentNullException("key");
}
if (!lockModifyChangeActionsKeys.ContainsKey(collectionChangeAction))
{
lockModifyChangeActionsKeys[collectionChangeAction] = key;
}
else
{
throw new ObservableComputationsException(this,
$"Modifying of '{collectionChangeAction.ToString()}' change action is already locked. Unlock first.");
}
}
