C#改动文件或文件夹的权限，为指定用户、用户组加入全然控制权限

//给Excel文件加入"Everyone,Users"用户组的全然控制权限            FileInfo fi = new FileInfo(excelPath);            System.Security.AccessControl.FileSecurity fileSecurity = fi.GetAccessControl();            fileSecurity.AddAccessRule(new FileSystemAccessRule("Everyone", FileSystemRights.FullControl, AccessControlType.Allow));            fileSecurity.AddAccessRule(new FileSystemAccessRule("Users", FileSystemRights.FullControl, AccessControlType.Allow));            fi.SetAccessControl(fileSecurity);            //给Excel文件所在文件夹加入"Everyone,Users"用户组的全然控制权限            DirectoryInfo di = new DirectoryInfo(Path.GetDirectoryName(excelPath));            System.Security.AccessControl.DirectorySecurity dirSecurity = di.GetAccessControl();            dirSecurity.AddAccessRule(new FileSystemAccessRule("Everyone", FileSystemRights.FullControl, AccessControlType.Allow));            dirSecurity.AddAccessRule(new FileSystemAccessRule("Users", FileSystemRights.FullControl, AccessControlType.Allow));            di.SetAccessControl(dirSecurity);