winform如何保持TreeView节点展开和折叠的状态

转载：http://blog.sina.com.cn/s/blog_6abcacf5010138q5.html

 private Hashtable NodesStatus = new Hashtable();

        private string SelectNodeFullPath = string.Empty;

        /// <summary>

        /// 

        /// </summary>

        /// <param name="nodes"></param>

        private void GetTreeNodesStatus(TreeNodeCollection nodes)

        {

            foreach (TreeNode node in nodes)

            {

                if (node.IsExpanded)

                {

                    NodesStatus[node.FullPath] = true;

                }

                else

                {

                    NodesStatus.Remove(node.FullPath);

                }

                if (node.IsSelected)

                {

                    SelectNodeFullPath = node.FullPath;

                }

                GetTreeNodesStatus(node.Nodes);

            }

        }



        /// <summary>

        /// 

        /// </summary>

        /// <param name="nodes"></param>

        private void SetTreeNodesStatus(TreeNodeCollection nodes)

        {

            foreach (TreeNode node in nodes)

            {

                if (NodesStatus[node.FullPath] != null)

                {

                    node.Expand();

                }

                if (node.FullPath == SelectNodeFullPath)

                {

                    this.tvAuthFuction.SelectedNode = node;

                }

                SetTreeNodesStatus(node.Nodes);

            }

        }

    }

View Code

调用：

然后在给TreeView添加Nodes的前面和后面分别添加上这两个函数，例如TreeView类的实例tv，就可以使用

GetTreeNodesStatus(tv.Nodes);

//更新TreeView函数

SetTreeNodesStatus(tv.Nodes);

这样就能实现TreeView的状态保持了