实体框架 6.1.3 当 dbContext 处理的分离对象为空时

Question

The below code uses DBContext, and at times I get Subject[] array being null and can only assume that detached objects on disposal of the context has an effect on these same objects making their references null out of the scope the above mentioned. That's when the subject[] array is returned to the caller. In the caller a reference to subjec[] at times returns null. Is this how it should be?

public Subject[] GetSubjectList()
{
    using (var dbContext = new DataAccess.TeachersAssistantDbContext())
    {
        _unitOfWork.InitializeDbContext(dbContext);
        return _unitOfWork._subjectRepository.GetAll();
    }
}

I was expecting since the dbContext is disposed, the objects get detached, and still should exist within the calling code provided there is a reference to them. I am getting this error with Entity Framework 6.1.3

Answer 1

Sorry Chaps, I run migrations before, and looks like there was one pending migration that didn't run. I checked, and indeed there was an addition to to the Model, and an Exception was being thrown about migrations expected due to inconsistency between database and dbContext. I have ever since run the migrations and the problem has been resolved. Many thanks for you help though. Someone may end up in this awkward situation without realising the Model Entities changed and not all migrations were run.