无Persister：与INotifyPropertyChanged拦截器保存时出错 [英] No Persister for: error on save with INotifyPropertyChanged Interceptor

问题描述

使用 NHibernate& INotifyPropertyChanged ，仓库将返回一个实现INotifyPropertyChanged的代理集合，但是在保存或删除它的时候会抛出一个错误：

在NHibernate.Impl.SessionFactoryImpl.GetEntityPersister（字符串实体名称）$ $ b $在NHibernate.Impl.SessionImpl.GetEntityPersister（字符串entityName，对象obj）
在NHibernate.Engine.ForeignKeys.IsTransient String entityName，Object entity，Nullable`1 assume，ISessionImplementor session）
 at NHibernate.Event.Default.AbstractSaveEventListener.GetEntityState（Object entity，String entityName，EntityEntry entry，ISessionImplementor source）
 at NHibernate.Event。在NHibernate.Event.Default.DefaultSaveOrUpdateEventListener.OnSaveOrUpdate（SaveOrUpdateEvent事件）
 NHibernate.Impl.SessionImpl.FireSaveOrUpdate（SaveOrUpdateEvent事件）
在NHibernate 
 .Impl.SessionImpl.SaveOrUpdate（Object obj）$ b $ MyCode ... 
  

如果我在没有拦截器的情况下创建会话，SaveOrUpdate工作正常，但是拦截器会出错。

用拦截器：

  public ISession GetSession（ISessionFactory factory）
 {
 IInterceptor dataBinding = new DataBindingInterceptor {SessionFactory = factory}; 
返回factory.OpenSession（dataBinding）; 
 
 $ / code> 

无
<$ p公共ISession GetSession（ISessionFactory工厂）
{
返回factory.OpenSession（）;

$ / code $




我不知如何去解决为什么拦截器会中断保存。

我对代码进行的唯一更改是更改行

类型类型= Type.GetType（clazz）;

to

类型type = FindType（clazz）;

  public Type FindType（string typeName）
 {
 foreach（AppDomain.CurrentDomain.GetAssemblies（） 
 {
类型foundType = assembly.GetType（typeName）; 
 
 if（foundType！= null）
 return foundType; 
} 
返回null; 
 
  

解决方案

解决方法是始终使用与拦截器会话。我用拦截器创建了IList，但是保存了一个通用的会话。这绕过了将代理重定向到正确的持久存储的GetEntityName覆盖。

Using the method described in NHibernate & INotifyPropertyChanged, the repository will return a collection of proxies that implement INotifyPropertyChanged, but on some objects when saving or deleting it will throw an error:

   at NHibernate.Impl.SessionFactoryImpl.GetEntityPersister(String entityName)
   at NHibernate.Impl.SessionImpl.GetEntityPersister(String entityName, Object obj)
   at NHibernate.Engine.ForeignKeys.IsTransient(String entityName, Object entity, Nullable`1 assumed, ISessionImplementor session)
   at NHibernate.Event.Default.AbstractSaveEventListener.GetEntityState(Object entity, String entityName, EntityEntry entry, ISessionImplementor source)
   at NHibernate.Event.Default.DefaultSaveOrUpdateEventListener.PerformSaveOrUpdate(SaveOrUpdateEvent event)
   at NHibernate.Event.Default.DefaultSaveOrUpdateEventListener.OnSaveOrUpdate(SaveOrUpdateEvent event)
   at NHibernate.Impl.SessionImpl.FireSaveOrUpdate(SaveOrUpdateEvent event)
   at NHibernate.Impl.SessionImpl.SaveOrUpdate(Object obj)
   at MyCode ...

I figured out that if I create the session without the interceptor the SaveOrUpdate works fine, but with the interceptor it errors.

with the interceptor:

 public ISession GetSession(ISessionFactory factory)
        {
            IInterceptor dataBinding = new DataBindingInterceptor {SessionFactory = factory};
            return factory.OpenSession(dataBinding);
        }

without

 public ISession GetSession(ISessionFactory factory)
        {
            return factory.OpenSession();
        }

I'm at a loss for how to go about even figuring out why the interceptor would break the save.

The only change I made to the code was changing the line

Type type = Type.GetType(clazz);

to

Type type = FindType(clazz);

public Type FindType(string typeName)
{
    foreach (Assembly assembly in AppDomain.CurrentDomain.GetAssemblies())
    {
        Type foundType = assembly.GetType(typeName);

        if (foundType != null)
            return foundType;
    }
    return null;
}

解决方案

Solution was to always use the session with the interceptor. I was creating the IList with the interceptor, but saving with a generic session. This bypassed the GetEntityName override which redirected the proxy to the correct persister.

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