最近在練.net core 的DI

我在想辦法把Controller 的DBContex挪到service裡

就是這一段

    public TransactionController(TransactionDbContext context)
        {
            _context = context;
        }

目前是完成了，但是執行時卻跑出下面這段錯誤

An error occurred while starting the application.
AggregateException: Some services are not able to be constructed (Error while validating the service descriptor 'ServiceType: CRUD.DATA.ITransaction Lifetime: Transient ImplementationType: CRUD.Service.TransactionService': Unable to resolve service for type 'CRUD.DATA.ApplicationDbContext' while attempting to activate 'CRUD.Service.TransactionService'.)

這個部份我沒遇過，暫時不知道問題所在
不知道有沒有人能去我的GIT幫我看一下呢?
https://github.com/Jarkwoof/jQuery-Ajax-CRUD

整體架構大概如圖

ApplicationDbContext是放DBContext

public class ApplicationDbContext : DbContext
{
public ApplicationDbContext(DbContextOptions options) : base(options)
{ }
public List Transactions { get; set; }
}
ITransaction則是定義CRUD相關方法

public interface ITransaction
{
List GetAll();
//TransacrionDto GetById(int id);
//void NewCategory(TransacrionDto category);
//void EditCategory(TransacrionDto category);
//void DeleteCategory(int id);
}
TransactionService則是實作介面裡的方法

  public class TransactionService : ITransaction
    {
        private readonly ApplicationDbContext _context;

        public TransactionService(ApplicationDbContext context)
        {
            _context = context;
        }

        public List<TransacrionDto> GetAll()
        {
            var query = (from x in _context.Transactions select new TransacrionDto { }).ToList<TransacrionDto>();
            return query;
        }

    }