使用smo在SqlServer中创建用户时出现问题

1) 如果已经有一个登录名“user1”,那么我通过调用 CreateDatabaseUser 作用

2) 否则,我将创建一个登录名“user1”,密码为“password1”,默认数据库为“db1”(仅在创建db1之后),使用 CreateServerLogin 然后我使用 CreateDatabaseUser

方法(2)在 newUser.Create(); 在里面 CreateDatabaseUser

说 Microsoft.SqlServer.Management.Smo.FailedOperationException: Create failed for User 'user1'. ---> Microsoft.SqlServer.Management.Common.ExecutionFailureException: An exception occurred while executing a Transact-SQL statement or batch. --- > System.Data.SqlClient.SqlException: '[user1]' is not a valid login or you do not have permission.

有什么问题吗?

private static Login CreateServerLogin(Server server, string database, string login, string password)
{
    var newLogin = new Login(server, login)
                       {
                           LoginType = LoginType.SqlLogin,
                           DefaultDatabase = database,
                           PasswordPolicyEnforced = false
                       };

    newLogin.Create(password);

    return newLogin;
}

private static User CreateDatabaseUser(Database database, string user, string login)
{            
    var newUser = new User(database, user) { UserType = UserType.SqlLogin, Login = login };

    newUser.Create();
    newUser.AddToRole("db_owner");
    return newUser;
}