Nhibernate Session.Evict（）是否必须对代理对象起作用？ （或者是否有其他方法克隆持久对象图？）

Question

I am trying to create a clone of a persisted object graph and it seems like Session.Evict(PersistedObject) is the way to do this. By removing the instance from the Session cache, I can then set persist it as a new "cloned" record.

I have tried three approaches and each has been unsuccessful.

1. Use eager loading to get my object graph from the db and attempt to Evict it. This results in a KeyNotFoundException
2. Use Session.Load(objectId) and attempt to evict it. Evict works, but I only have a proxy to work with and not the hydrated object I need
3. Use Session.Get(objectId) and attempt to Evict it. This results in a KeyNotFoundException

I've struggled to find any real documentation or examples on this subject. I've found some that come close, but nothing that really explains where I'm going wrong

• NHibernate Session.Evict()
• NHibernate evict by id
• http://thecuttingledge.com/?tag=nhibernate#.V1XQHZF96M8
• How do I copy an object with NHibernate
• https://sonyarouje.com/2013/11/13/keynotfoundexception-from-nhibernates-session-evict/

With regards to the last link, I have checked my Equals and GetHashCode methods, but they do not get hit when calling Evict. Also, Session.Contains(objectToBeEvicted) returns true just prior to the Evict()

As for the second question in the title - is there a better way to approach this problem? This can't be such a rare scenario

Thanks in advance

Answer 1

To answer the initial question:

No, Evict() is not limited to acting on proxies, it can remove any object from the session. If you are getting some sort of exception, most likely you are doing something wrong, but the question does not contain enough information to figure out what.

Answer 2

尝试对对象进行深度克隆（ .Net深度克隆-这样做的最佳方法是什么？ ），然后将其添加到会话中。