处理TreeView的AfterSelect事件，并通过e.Node参数检索相应的节点.
然后，您可以使用该信息显示更多信息.
抱歉，但是在不了解您需要显示的内容，TreeNode的内容等等的情况下，我不能再给您任何东西了！

Handle the AfterSelect event for the TreeView, and retrieve the appropriate node via the e.Node parameter.
You can then use that information to display further information.
Sorry, but without knowing a lot more about what you need to display, what your TreeNodes hold, and so forth, I can''t give you any more!