重构为领域驱动设计

我有一个场景正在尝试重构为 DDD。我有一个批处理，它是一个聚合和批处理条目列表。创建批处理并添加批处理条目后，将向批处理中的个人发送一条短信，并且批处理的状态将从正在运行更改为已发布。

关于如何使设计更好的任何想法？该域有两个聚合 Batch 和 BatchEntry，其中 Batch 是聚合根。

代码如下所示

public class Batch : EntityBase, IValidatableObject
{
    public int BatchNumber { get; set; }
    public string Description { get; set; }
    public decimal TotalValue { get; set; }
    public bool SMSAlert { get; set; }
    public int Status { get; set; }
    private HashSet<BatchEntry> _batchEntries;
    public virtual ICollection<BatchEntry> BatchEntries
    {
        get{
            if (_batchEntries == null){
                _batchEntries = new HashSet<BatchEntry>();
            }
            return _batchEntries;
        }
        private set {
            _batchEntries = new HashSet<BatchEntry>(value);
        }
    }
    public static Batch Create(string description, decimal totalValue, bool smsAlert)
    {
        var batch = new Batch();
        batch.GenerateNewIdentity();
        batch.Description = description;
        batch.TotalValue = totalValue;
        batch.SMSAlert = smsAlert;
        return batch;
    }
    public IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
    {
        // 
    }
}
public interface IBatchRepository : IRepository<Batch>
{
    int NextBatchNumber();
}
public class BatchEntry : EntityBase, IValidatableObject
{
    public Guid BatchId { get; set; }
    public virtual Batch Batch { get; private set; }
    public decimal Amount { get; set; }
    public Guid CustomerAccountId { get; set; }
    public virtual CustomerAccount CustomerAccount { get; private set; }
    public static BatchEntry Create(Guid batchId, Guid customerAccountId, decimal amount)
    {
        var batchEntry = new BatchEntry();
        batchEntry.GenerateNewIdentity();
        batchEntry.BatchId = batchId;
        batchEntry.CustomerAccountId = customerAccountId;
        batchEntry.Amount = amount;
        return batchEntry;
    }
    public IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
    {
        //
    }
}
public interface IBatchEntryRepository : IRepository<BatchEntry>{}

和域服务通过应用程序服务公开。应用程序服务中的代码如下：

//Application Services Code
public class BatchApplicationService : IBatchApplicationService
{
    private readonly IBatchRepository _batchRepository;
    private readonly IBatchEntryRepository _batchEntryRepository;
    public BatchAppService(IBatchRepository batchRepository, IBatchEntryRepository batchEntryRepository)
    {
        if (batchRepository == null) throw new ArgumentNullException("batchRepository");
        if (batchEntryRepository == null) throw new ArgumentNullException("batchEntryRepository");
        _batchRepository = batchRepository;
        _batchEntryRepository = batchEntryRepository;
    }
    public BatchDTO AddNewBatch(BatchDto batchDto)
    {
        if (batchDto != null)
        {
            var batch = Batch.Create(batchDto.Description, batchDto.TotalValue, batchDto.SMSAlert);
            batch.BatchNumber = _batchRepository.NextBatchNumber();
            batch.Status = (int)BatchStatus.Running;
            SaveBatch(batch);
            return batch.Map<BatchDto>();
        }
        else
        {
            //
        }
    }
    public bool UpdateBatch(BatchDto batchDto)
    {
        if (batchDto == null || batchDto.Id == Guid.Empty)
        {
            //
        }
        var persisted = _batchRepository.Get(batchDto.Id);
        if (persisted != null)
        {
            var result = false;
            var current = Batch.Create(batchDto.Description, batchDto.TotalValue, batchDto.SMSAlert);
            current.ChangeCurrentIdentity(persisted.Id);
            current.BatchNumber = persisted.BatchNumber;
            current.Status = persisted.Status;
            _batchRepository.Merge(persisted, current);
            _batchRepository.UnitOfWork.Commit();
            if (persisted.BatchEntries.Count != 0){
                persisted.BatchEntries.ToList().ForEach(x => _batchEntryRepository.Remove(x));
                _batchEntryRepository.UnitOfWork.Commit();
            }
            if (batchDto.BatchEntries != null && batchDto.BatchEntries.Any())
            {
                List<BatchEntry> batchEntries = new List<BatchEntry>();
                int counter = default(int);
                batchDTO.BatchEntries.ToList().ForEach(x =>
                {
                    var batchEntry = BatchEntry.Create(persisted.Id, x.CustomerAccountId, x.Amount);
                    batchEntries.Add(batchEntry);
                });
            }
            else result = true;
            return result;
        }
        else
        {
            //
        }
    }
    public bool MarkBatchAsPosted(BatchDto batchDto, int authStatus)
    {
        var result = false;
        if (batchDto == null || batchDto.Id == Guid.Empty)
        {
            //
        }
        var persisted = _batchRepository.Get(batchDto.Id);
        if (persisted != null)
        {
            var current = Batch.Create(batchDto.Description, batchDto.TotalValue, batchDto.SMSAlert);
            current.ChangeCurrentIdentity(persisted.Id);
            current.BatchNumber = persisted.BatchNumber;
            current.Status = authStatus;
            _batchRepository.Merge(persisted, current);
            _batchRepository.UnitOfWork.Commit();
            result = true;
        }
        else
        {
            //
        }
        return result;
    }
    private void SaveBatch(Batch batch)
    {
        var validator = EntityValidatorFactory.CreateValidator();
        if (validator.IsValid<Batch>(batch))
        {
            _batchRepository.Add(batch);
            _batchRepository.UnitOfWork.Commit();
        }
        else throw new ApplicationValidationErrorsException(validator.GetInvalidMessages(batch));
    }
}

问题：

1. 批处理状态（即正在运行、已发布）应分配到何处？
2. 是否应将 MarkBatchAsPosted 方法定义为批处理实体中的 mehod？
3. 如何最好地为领域驱动设计重新设计？