public bool HasAncestor(Folder ancestor)
{
if (ancestor == null)
{
throw new ArgumentNullException("ancestor");
}
if (device != ancestor.device)
{
throw new ArgumentException("Folders are on different devices");
}
bool hasAncestor = false;
if (parentId != 0)
{
if (parentId == ancestor.FolderId)
{
hasAncestor = true;
}
else
{
Folder parent = CreateParentFolder();
hasAncestor = parent.HasAncestor(ancestor);
}
}
return(hasAncestor);
}