var security = new DirectorySecurity();
string path=@"C:\temp"
//设置权限的应用为文件夹本身、子文件夹及文件,所以需要InheritanceFlags.ContainerInherit 或 InheritanceFlags.ObjectInherit
security.AddAccessRule(new FileSystemAccessRule("NETWORK SERVICE", FileSystemRights.FullControl, InheritanceFlags.ContainerInherit | InheritanceFlags.ObjectInherit, PropagationFlags.None, AccessControlType.Allow));
security.AddAccessRule(new FileSystemAccessRule("Everyone", FileSystemRights.FullControl, InheritanceFlags.ContainerInherit | InheritanceFlags.ObjectInherit, PropagationFlags.None, AccessControlType.Allow));
Directory.SetAccessControl(path, security);
