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);
}
}
}
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