Question

我遇到Unity依赖注入问题。当我尝试使用构造函数注入时，我注入的服务保持为空/ null。

public UserService(IUnitOfWorkIntranet unitOfWork, IUserRepository userRepository)
   {
     mappingToDomainModel = IntranetMappingToDomainModel.GetMappingToDomainModelInstance;
     IntranetAutoMapperConfiguration autoMapper = IntranetAutoMapperConfiguration.GetAutoMapperConfigurationInstance;
     unitOfWorkIntranet = unitOfWork;
     userRepository = userRepository;
    }

但是，当我使用getter时，一切正常。

private IUserRepository _userRepository
   {
      get
   {
      return GlobalConfiguration.Configuration.DependencyResolver.GetService(typeof(IUserRepository)) as UserRepository;
   }
   }

据我所知，它在UnityConfig.cs中正确配置

container.RegisterType<IUnitOfWorkIntranet, UnitOfWorkIntranet>();
container.RegisterType<IUserService, UserService>();
container.RegisterType<IUserRepository, UserRepository>();

我在这里遗漏了什么吗？为什么我的构造函数注入了？

欢迎任何帮助，问候！

Answer 1

使用Unity的构造函数注入有一个简单的工作示例：

public interface IUnitOfWorkIntranet { }

public class UnitOfWorkIntranet : IUnitOfWorkIntranet{}

public interface IUserRepository { }

public class UserRepository : IUserRepository{}

public interface IUserService{}

public class UserService : IUserService
{
    public IUnitOfWorkIntranet UnitOfWork { get; }
    public IUserRepository UserRepository { get; }
    public UserService(IUnitOfWorkIntranet unitOfWork, IUserRepository userRepository)
    {
        UnitOfWork = unitOfWork;
        UserRepository = userRepository;
    }
}

配置和解决：

var container = new UnityContainer();
container.RegisterType<IUnitOfWorkIntranet, UnitOfWorkIntranet>();
container.RegisterType<IUserService, UserService>();
container.RegisterType<IUserRepository, UserRepository>();

var service = (UserService)container.Resolve<IUserService>();

依赖注入 - Unity构造函数注入不起作用，只有getter setter注入

1 个答案: