/// <summary>
/// Sets the specified TItem at the specified index;
/// Connects the item to the model tree;
/// Notifies the TItem about the event.
/// </summary>
/// <exception cref="ArgumentException">
/// If the new item has already a parent or if the slot at the specified index is not null.
/// </exception>
/// <remarks>
/// Note that the function requires that _item[index] == null and
/// it also requires that the passed in item is not included into another ContentElementCollection.
/// </remarks>
internal override void PrivateConnectChild(int index, TableColumn item)
{
Debug.Assert(item != null && item.Index == -1);
Debug.Assert(Items[index] == null);
// If the TItem is already parented correctly through a proxy, there's no need
// to change parentage. Otherwise, it should be parented to Owner.
if (item.Parent is DummyProxy)
{
if (LogicalTreeHelper.GetParent(item.Parent) != Owner)
{
throw new System.ArgumentException(SR.Get(SRID.TableCollectionWrongProxyParent));
}
}
else
{
if (item.Parent != null)
{
throw new System.ArgumentException(SR.Get(SRID.TableCollectionInOtherCollection));
}
Owner.AddLogicalChild(item);
}
// add the item into collection's array
Items[index] = item;
item.Index = index;
// notify the TItem about the change
item.OnEnterParentTree();
}