//用指定的文本构造一个节点，将其添加为参数parant的子节点，并返回刚构造的节点
private TreeNode AddNode(TreeNode parant,string text)
{
	TreeNode node = new TreeNode(text);
	parant.Nodes.Add(node);
	return node;
}

//递归地找到参数entry的所有子节点，并在treeView1中显示；这里的entry与entryNode需相对应
private void EnumChildren(DirectoryEntry entry,TreeNode entryNode)
{
	if(entry.Children!=null)		//如果无子节点则结束
	{
		foreach(DirectoryEntry i in entry.Children)
		{
			//将各子节点加入TreeView,并进行递归
			EnumChildren(i,AddNode(entryNode,i.Name));
		}
	}
}

//用给定的字符串构造根节点，并列出其所有子节点
private void Enumerate(string path)
{
	try 
	{
		using(DirectoryEntry root = new DirectoryEntry(path))
		{
			TreeNode node = new TreeNode(root.Name);
			treeView1.Nodes.Add(node);
			EnumChildren(root,node);
		}
	}
	catch {}
}