将具有通用和具体实现的存储库注入控制器

Question

我正在制作一个通用存储库，但对于某些实体，我还需要通用存储库未提供的功能。我有一个接口 IGenericRepository 和作为具有基本 CRUD 操作的 GenericRepository 的具体实现。此外，我有一个 studentRepository，它使用通用存储库，但也具有独立于通用存储库的独立功能，为此我有一个名为 IStudentRepository 的接口。

示例代码如下：

  public interface IGenericEntityRepository<T> 
  {
        Delete(T entity);

        T Get(int id);

        IEnumerable<T> GetAll();

        Add(T entity);

        Update(T entity);
  }


public class GenericEntityRepository<T> : IGenericEntityRepository<T> where T : class
 {

        protected readonly ApplicationDbContext _applicationDbContext;

        public GenericEntityRepository(ApplicationDbContext applicationDbContext)
        {
            this._applicationDbContext = applicationDbContext;
        }

     //Generic Repository Implementations....
 }


 public interface IStudentRepository
 {
      string GetFullName(Student student)
      double GetGpa(Student student)
 }

 public class StudentRepository: GenericRepository<Student>, IStudentRepository
 {
    public StudentRepository(ApplicationDbContext applicationDbContext) : base(applicationDbContext)
    {}

    //IStudentRepository functions' implementations...
 }

Now I need to inject this StudentRepository to my StudentsController 

 public class StudentsController : Controller
 {
        private readonly IGenericEntityRepository<Student> _genericStudentRepository;

        public StudentsController(IGenericEntityRepository<Student> _genericStudentRepository)
        {
            this._genericStudentRepository = genericRepository;           
        }

        public void testAccessibility() 
        {
             this._genericStudentRepository.GetAll() //valid call
             this._genericStudentRepository.GetAllGpa() //invalid Call 
             ***As expected cause IGenericEntityRepository doesn't have that ***function 
        }  

 }

正如您在这里看到的问题，如果我注入 IGenericEntityRepository，我只会获得 genericrepository 功能。如果我想要不包含在 genericRepository 中的 Student 存储库的功能，我必须像下面一样注入 IGenericEntityRepository 和 IStudentRepository，反之亦然。

 public class StudentsController : Controller
 {
        private readonly IGenericEntityRepository<Student> _genericStudentRepository;
        private readonly IStudentRepository _studentsRepository;

        public StudentsController(IGenericEntityRepository<Student> _genericStudentRepository, IStudentRepository studentsRepository)
        {
            this._genericStudentRepository = genericRepository;
            this.__studentsRepository = studentsRepository;
        }

  public void testAccessibility() 
        {
             this._genericStudentRepository.GetAll() //valid call
             this._studentsRepository.GetAllGpa() //valid call 
        }  



 }

有更好的方法吗？像这样注入两个上下文相同但编码方式不同的对象感觉不对。

Answer 1

您可以 IStudentRepository 扩展 IGenericEntityRepository<T>:

public interface IStudentRepository : IGenericEntityRepository<Student> 
{
      string GetFullName(Student student)
      double GetGpa(Student student)
}

现在注入IStudentRepository应该就可以使用所有的功能了

将具有通用和具体实现的存储库注入控制器

Inject a repository which has Generic as well as Concrete Implementation to a controller

c#

generics

dependency-injection

repository

.net-core