带有Repository和UnitOfWork的EF CodeFirst CTP5:System.InvalidOperationException(...不是......当前上下文的一部分...)

时间:2010-12-20 08:38:38

标签: .net ef-code-first

我正在测试EF CodeFirst CTP5,并且正在尝试实现工作单元和存储库模式。但是当我进行一个简单的测试时,我得到了:

System.InvalidOperationException:实体类型Log不是当前上下文模型的一部分。

数据库获取由EF创建,当我调用时,它会失败.Add() 似乎没有使用相同的上下文,但我无法弄清楚为什么?

希望一些聪明的人来救我! 提前感谢您抽出宝贵时间。

以下是一些代码:

LogCabinContext

public class LogCabinContext : DbContext, IUnitOfWork
{
    public LogCabinContext() { }

    public LogCabinContext(string nameOrConnectionString)
        : base(nameOrConnectionString)
    {

    }

    #region IUnitOfWork Members

    public void Save()
    {
        base.SaveChanges();
    }

    #endregion
}

BaseRepository

public class BaseRepository<T> : IBaseRepository<T> where T : EntityBase
{
    public LogCabinContext _unitOfWork;
    private DbSet<T> _dbSet;

    public BaseRepository(IUnitOfWork unitOfWork)
    {
        if (unitOfWork == null)
            throw new NullReferenceException("UnitOfWork must not be null");

        _unitOfWork = unitOfWork as LogCabinContext;
        _dbSet = _unitOfWork.Set<T>();
    }

    #region IBaseRepository Members

    public T GetById(int id)
    {
        return _dbSet.SingleOrDefault(x => x.Id == id);
    }

    public void Add(T entity)
    {
        _dbSet.Add(entity);
    }

    public void Delete(T entity)
    {
        _dbSet.Remove(entity);
    }

    public IEnumerable<T> List()
    {
        return _dbSet.OrderBy(x => x.Id).AsEnumerable();
    }

    public IUnitOfWork CurrentUnitOfWork
    {
        get { return _unitOfWork; }
    }
    #endregion

    #region IDisposable Members

    public void Dispose()
    {
        _unitOfWork.Dispose();
    }

    #endregion
}

SimpleTest,使用Ninject构建上下文,这是因为我创建了数据库

[TestFixture]
public class LogRepositoryTests
{
    IKernel _kernel;

    [SetUp]
    public void SetUp()
    {
        _kernel = new StandardKernel(new DatabaseModule());
    }

    [TearDown]
    public void TearDown()
    {
        _kernel.Dispose();
    }

   public ILogRepository GetLogRepository()
   {
        ILogRepository logRepo = _kernel.Get<ILogRepository>();

        return logRepo;
   }

   [Test]
   public void Test()
   {
        using (ILogRepository repo = this.GetLogRepository())
        {
           Log myLog = new Log();
           myLog.Application = "Test";
           myLog.Date = DateTime.Now;
           myLog.Exception = "Exception message";
           myLog.Machinename = "local";
           myLog.Message = "Testing";
           myLog.Stacktrace = "Stacktrace";

           repo.Add(myLog);
        }
   }
}

ILogRepository,现在只是从base派生

public interface ILogRepository : IBaseRepository<Log>
{
}

1 个答案:

答案 0 :(得分:1)