LINQ to LDAP：如果用户被锁定，则在更新时lockoutTime设置为0

Question

我们正在开发一个门户网站，管理员可以在其中管理Active Directory中的用户和组对象，而无需访问服务器本身。

每当用户被政策锁定时，即使我们没有更新 lockoutTime 属性，更新用户也会始终解锁用户

这是我们用于LINQ to LDAP的ClassMap

 public override IClassMap PerformMapping(string namingContext = null, string objectCategory = null, bool includeObjectCategory = true, IEnumerable<string> objectClasses = null, bool includeObjectClasses = true)
    {
        NamingContext(namingContext);

        ADUserEntity.SetNamingContext(namingContext);

        ObjectCategory("Person");
        ObjectClass("User");

        DistinguishedName(x => x.DistinguishedName);
        Map(x => x.Name).Named(Identity.cn).ReadOnly();
        Map(x => x.Department).Named(Identity.department);
        Map(x => x.Id).Named(Identity.objectGUID).StoreGenerated();
        Map(x => x.Title).Named(Identity.title);
        Map(x => x.GivenName).Named(Identity.givenName);

        Map(x => x.SurName).Named(Identity.sn);
        Map(x => x.MiddleName).Named(Identity.middleName);
        Map(x => x.SAMAccountName).Named(Identity.sAMAccountName);

        Map(x => x.AccountControl).Named(Identity.userAccountControl);
        Map(x => x.DisplayName).Named(Identity.displayName);

        Map(x => x.TelephoneNumber).Named(Identity.telephoneNumber);
        Map(x => x.MemberOf).Named(Identity.memberof);
        Map(x => x.LockoutTime).Named(Identity.lockoutTime).ReadOnly();
        Map(x => x.LastLogon).Named(Identity.lastLogon).ReadOnly();
        Map(x => x.EmailAddress).Named(Identity.mail).ReadOnly();
        Map(x => x.PwdLastSet).Named(Identity.pwdLastSet).ReadOnly();

        Map(x => x.UserPrincipalName).Named(Identity.userPrincipalName);

        return this;
    }

LockoutTime有一个简单的getter / setter

    ...

    public override long? LockoutTime
    {
        get
        {
            return _userEntity.LockoutTime;
        }

        set
        {
            _userEntity.LockoutTime = value;
        }
    }
    ...

我已经尝试删除LockoutTime映射上的.ReadOnly（）属性，这会导致在LINQ to LDAP中抛出异常，而这又是由Active Directory服务器抛出的错误消息引起的（Windows Server 2012 R2）