NHibernate事件监听器 [英] NHibernate event listeners

问题描述

我正在尝试使用FluentNHibernate将IPostLoadEventListener的实现添加到我的NHibernate配置中.我可以按照以下说明进行操作:

I'm trying to add an implementation of IPostLoadEventListener to my NHibernate configuration using FluentNHibernate. I can do so as illustrated here:

如何通过流利的nhibernate添加事件侦听器?

但是，创建一个新数组来替换旧数组将完全丢弃所有现有的事件侦听器.我可以这样解决:

However, creating a new array to replace the old one completely discards any existing event listeners. I can get around that like so:

return Fluently.Configure()
    .Database(config)
    .Mappings(m => m.AutoMappings.Add(mappings))
    .ExposeConfiguration(cfg =>
        {
            cfg.EventListeners.PostLoadEventListeners =
                new IPostLoadEventListener[] { 
                    new UtcDateEventListener(),
                    new DefaultPostLoadEventListener() // <<< this one is the default
                };
            cfg.EventListeners.SaveOrUpdateEventListeners =
                new ISaveOrUpdateEventListener[] { 
                    new UtcDateEventListener(),
                    new DefaultSaveOrUpdateEventListener() // <<< this one is the default
                };
        })
    .BuildConfiguration()
    .BuildSessionFactory();

但是我仅通过逐步检查代码来确定我要覆盖的内容，从而了解默认事件侦听器.我想添加事件侦听器而不覆盖任何现有的事件侦听器，但是对我来说，这样做就像我上面显示的那样.现有的事件侦听器以数组(而不是集合或列表，这更有意义)公开.有没有更清洁的方法来解决这个问题?

But I only know about the default event listeners by stepping through the code to determine what I was overwriting. I'd like to add my event listener without overwriting any existing event listeners, but doing so like I've shown above seems very smelly, to me. The existing event listeners are exposed as an array (rather than a collection or a list, which would make more sense). Is there a cleaner way to handle this?

推荐答案

您的意思是这样的吗:

using System.Linq;

...

var list = cfg.EventListeners.PostLoadEventListeners.ToList();
list.Add(new MyPostLoadEventListener());
cfg.EventListeners.PostLoadEventListeners = list.ToArray();

应该可以:)

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