c# - 使用 DI 时无法解析服务

Question

我正在尝试实现存储库模式并利用依赖注入(inject)。在下面的代码中，我有一个 Genmeric Repository 接口(interface)和类，其他存储库接口(interface)和类都从中派生，如下面的 InvestmentTransactionRepository 示例。

在我的 GenericRepository 类中，我尝试 DI 应用程序 dbContext。

代码:

接口(interface)/IGenericRepository.cs

namespace WebApi.Shared.Interfaces
{
    public interface IGenericRepository<T> where T : class
    {
    }
}

接口(interface)/IInvestmentTransactionRepository.cs

namespace WebApi.Shared.Interfaces
{
    public interface IInvestmentTransactionRepository : IGenericRepository<InvestmentTransactionEntity>
    {
    }
}

/Repositories/GenericRepository.cs

using WebApi.Shared.Interfaces;

namespace WebApi.Shared.Repositories
{
    public class GenericRepository<T> : IGenericRepository<T> where T : class
    {
        protected readonly AccountingContext _context;

        public GenericRepository(AccountingContext context)
        {
            _context = context;
        }
    }
}

/Repositories/InvestmentTransactionRepository.cs

namespace WebApi.Shared.Repositories
{
    public class InvestmentTransactionRepository : GenericRepository<InvestmentTransactionEntity>, IInvestmentTransactionRepository
    {
        public InvestmentTransactionRepository(AccountingContext dbContext) : base(dbContext)
        {
        }
    }
}

/Controllers/InvestmentController.cs

namespace WebApi.Controllers
{
    [Route("[controller]")]
    [ApiController]
    public class InvestmentsController : ControllerBase
    {
        private Services.IUserService _userService;
        private Shared.Repositories.InvestmentTransactionRepository _investmentTransactionRepository;

        public InvestmentsController(Services.IUserService userService, 
                                     WebApi.Shared.Repositories.InvestmentTransactionRepository investmentTransactionRepository)
        {
            _userService = userService;
            _investmentTransactionRepository = investmentTransactionRepository;
        }

        [Authorize]
        [HttpPost("list")]
        public IActionResult List(RequestContext.Investment.ListDto request)
        {
        }
    }
}

/AccountingContext.cs

namespace WebApi.Shared
{
    public class AccountingContext : DbContext
    {
        public AccountingContext()
        {
        }

        public AccountingContext(DbContextOptions<AccountingContext> options) : base(options)
        {
        }
        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
        {
            // hidden
        }
    }
}

/Program.cs

services.AddScoped<AccountingContext>();
services.AddScoped(typeof(IGenericRepository<>), typeof(GenericRepository<>));
services.AddScoped<IInvestmentEntityRepository, InvestmentEntityRepository>();
services.AddScoped<IInvestmentTransactionRepository, InvestmentTransactionRepository>();

当我运行上面的代码时，构建成功，但在运行时产生以下错误:

尝试激活“WebApi.Controllers.InvestmentsController”时无法解析类型“WebApi.Shared.Repositories.InvestmentTransactionRepository”的服务

有人能看出我做错了什么吗？

Answer 1

您正在向容器添加IInvestmentTransactionRepository(接口(interface))，但尝试注入(inject)和解析WebApi.Shared.Repositories.InvestmentTransactionRepository(该类)。您应该将类​​添加到容器或(更好)注入(inject)接口(interface)。