[英]Reason for MappingException: No persister for: MyClassProxy
In a SaveOrUpdate
call I'm getting the MappingException No persister for: MyClassProxy
. 在SaveOrUpdate
调用中,我得到了MappingException No persister for: MyClassProxy
。
What's strange is that I am able to insert new rows with the code, but if that row exists and the repository tries to update it, I'm getting this exception. 奇怪的是,我能够用代码插入新行,但是如果该行存在并且存储库尝试对其进行更新,则会出现此异常。
After searching and reading a lot of questions about this exception, that didn't help me to find the reason for this, I'll ask myself: What possible reasons can lead to this exception, if the mapping works for reading / inserting data? 在搜索并阅读了很多有关此异常的问题之后,这些问题没有帮助我找到原因,我会问自己:如果映射可用于读取/插入数据,那么可能导致此异常的原因是什么?
Some more information about my case: 有关我的案件的更多信息:
ClassMapping
and a SubclassMapping
with a discriminator 该映射由一个ClassMapping
和一个带有区分ClassMapping
的SubclassMapping
组成 I had this same exact issue. 我有同样的问题。 Basically I implemented a NHibernate.EmptyInterceptor to support INotifyPropertyChanged notifications. 基本上,我实现了NHibernate.EmptyInterceptor以支持INotifyPropertyChanged通知。
but the example I used online missed 1 key step... it didn't override the GetEntityName method so proxies would be 'converted' back to the actual objects. 但是我在线使用的示例错过了1个关键步骤……它没有覆盖GetEntityName方法,因此代理将被“转换”回实际对象。
public override string GetEntityName(object entity)
{
Type type = entity.GetType();
if (type.FullName.StartsWith("Castle.Proxies") &&
type.FullName.EndsWith("Proxy"))
{
return type.BaseType.FullName;
}
return base.GetEntityName(entity);
}
Source answer: Persisting a Castle DynamicProxy that's not associated with a NH Session 源答案: 持久存在与NH Session不相关的Castle DynamicProxy
Note: the example used "Castle.Proxies" I did not use this and deleted this condition from the if block 注意:该示例使用了“ Castle.Proxies”,我没有使用它,而是从if块中删除了此条件
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