说明：  又一个TreeView树形视图菜单，基于C#源码环境，也就是树形菜单，可展开显示所属的子项目，使用挺广泛，如果你想学习下如何在C#中使用TreeView，本源码相信是个不错的示例，简单，没有其它额外功能，如上图示，点击“+”图标，将会依次显示出包括有子项目的文件夹视图，当检测子级中又包括有子级目录的话，会自动显示“+”。
(Another TreeView tree view menu, based on C# source environment, that is, the menu tree, expand the sub display belongs to, use very extensive, if you want to learn how to use the TreeView next in C#, the source is believed to be a good example , simple, and no other additional features, as shown, click on the + icon will turn shows including sub folder view, when detecting a child, he also includes the sub-level directory, then automatically displays the + . )