Question

是否可以在父事务中的PreInsert事件侦听器中保存新实体（在我的情况下为secondEntity）（在我的情况下为primaryEntity）？我希望它们都在一个事务中执行，这意味着当primaryEntitysave失败时，我不想持久化secondEntity，当secondEntity失败时，我不想持久化primaryEntity。两个实体都必须存在于db中。

我的事件监听器代码

 public async Task<bool> OnPreInsertAsync(PreInsertEvent @event, CancellationToken cancellationToken)
    {
        using (var innerSession = @event.Session.SessionWithOptions().Connection().OpenSession())
        {
            var secondEntity = new Entity();

            await innerSession.SaveAsync(secondEntity);
        }

        return false;
    }

在这种情况下，secondEntity不会持久保存到数据库。当我在事件行的末尾添加内容时： await innerSession.FlushAsync() 然后secondEntity被保留，但是firstEntity插入可能失败，然后由于db中仅存在一个实体，因此我的数据不一致。

当我尝试：await @event.Session.SaveAsync(secondEntity)时出现错误：

System.InvalidOperationException : Collection was modified; enumeration operation may not execute.
   at System.Collections.Generic.List`1.Enumerator.MoveNextRare()
   at NHibernate.Engine.ActionQueue.ExecuteActionsAsync(IList list, CancellationToken cancellationToken)
   at NHibernate.Engine.ActionQueue.ExecuteActionsAsync(CancellationToken cancellationToken)
   at NHibernate.Engine.ActionQueue.ExecuteActionsAsync(CancellationToken cancellationToken)
   at NHibernate.Event.Default.AbstractFlushingEventListener.PerformExecutionsAsync(IEventSource session, CancellationToken cancellationToken)
   at NHibernate.Event.Default.DefaultFlushEventListener.OnFlushAsync(FlushEvent event, CancellationToken cancellationToken)
   at NHibernate.Impl.SessionImpl.FlushAsync(CancellationToken cancellationToken)
   at NHibernate.Impl.SessionImpl.BeforeTransactionCompletionAsync(ITransaction tx, CancellationToken cancellationToken)
   at NHibernate.Transaction.AdoTransaction.CommitAsync(CancellationToken cancellationToken)

在父事务的PreInsert事件侦听器中保存新实体

0 个答案: