public SetParentChildForm(decimal mapid)
        {
            InitializeComponent();

            DataTable roottable = MapDBClass.GetTifInformation(mapid);

            //查询影像图结构
            PhotoList        = MapDBClass.GetPhotoList();
            ParentChildTable = MapDBClass.GetChildList();
            treeView1.Nodes.Clear();
            if (roottable != null && roottable.Rows.Count == 1)
            {
                TreeNode rootnode = new TreeNode(roottable.Rows[0]["Name"].ToString())
                {
                    Tag = roottable.Rows[0]["PhotoId"]
                };
                treeView1.Nodes.Add(rootnode);
                AddNode(rootnode);
                treeView1.SelectedNode = rootnode;
            }
        }