TreeView控件用来显示信息的分级视图，如同Windows里的资源管理器的目录。TreeView控件中的各项信息都有一个与之相关的Node对象。TreeView显示Node对象的分层目录结构，每个Node对象均由一个Label对象和其相关的位图组成。在建立TreeView控件后，我们可以展开和折叠、显示或隐藏其中的节点。TreeView控件一般用来显示文件和目录结构、文档中的类层次、索引中的层次和其他具有分层目录结构的信息。

-TreeView control is used to display information about the hierarchical view, as in the Windows Explorer directory. Each information in the TreeView control has a Node object associated with it. TreeView displays the hierarchical structure of the Node object, each Node object is composed of a Label object and its associated bitmap. After the establishment of the TreeView control, we can expand and collapse, show or hide the node. TreeView control is generally used to display files and directory structure, documents in the class hierarchy, the index in the hierarchy and other information with hierarchical directory structure.