使用NHibernate 2.1 Linq时获取异常 <T> ，为什么呢？

Question

When using the NHibernate 2.1 with Linq assembly, we get an exception when trying to enumerate the results or invoking ToList().

we have a list of Id that we want to get the records of them, we used the following code

public List<TEntity> GetAllContainsItems<TEntity>(List<int> ids) 
    where TEntity : IEntity
{
    using (IUnitOfWork uof = _container.Resolve<IUnitOfWork>())
    {
        uof.Initialize();

        IRepository<TEntity> rep 
            = _container.Resolve<IRepository<TEntity>>();

        // repository exposes the ISession.Linq<T> of nhibernate.
        var res = rep.Find().Where(y => ids.Contains(y.Id) );

        // get the exception:
        // "Object reference not set to an instance of an object."

        return res.ToList();
    }
}

any thoughts ?

PS We can't change the Dll for now .

Answer 1

Can you change your code to the following and see if it works:

if(ids==null)
{
   Console.WriteLine("Why am I not surprised");
}
var res = rep.Find().Where(y => y!=null && ids.Contains(y.Id));
return res.ToList();