string path = "C:\\dir1\\dir2\\foo.txt"; string str = "GetFullPath：" + Path.GetFullPath(path) + "\r\n"; str += "GetDirectoryName：" + Path.GetDirectoryName(path) + "\r\n"; str += "GetFileName：" + Path.GetFileName(path) + "\r\n"; str += "GetFileNameWithoutExtension：" + Path.GetFileNameWithoutExtension(path) + "\r\n"; str += "GetExtension：" + Path.GetExtension(path) + "\r\n"; str += "GetPathRoot：" + Path.GetPathRoot(path) + "\r\n"; MessageBox.Show(str); 结果： GetFullPath：C:\dir1\dir2\foo.txt GetDirectoryName：C:\dir1\dir2 GetFileName：foo.txt GetFileNameWithoutExtension：foo GetExtension：.txt GetPathRoot：C:\