一个C#浏览文件夹的对话框源程序，也就是用C#自定义的方式指定需要打开的文件或文件夹，并返回值，实用性不大，但这是提高编程水平的基矗-A C# source code Browse For Folder dialog box, it is to use C# custom specify need to open the file or folder, and returns the value, practicality is not, but it is to improve the pro