Question

我是Asp .Net Core的新手，我使用它创建了App。我在我的项目中使用通用存储库。但我有一个错误：

无法解析类型＆＃39; Microsoft.EntityFrameworkCore.DbContext＆＃39;在尝试激活＆＃39; ECommerce.Repository.ProductRepository＆＃39;。
时

BaseRepository

protected DbContext _dbContext;
    protected readonly DbSet<T> _dbSet;

    public BaseRepository(DbContext dbContext)
    {
        _dbContext = dbContext;
        _dbSet = dbContext.Set<T>();
    }

存储库

public partial class ProductRepository : BaseRepository<Product>, IProductRepository
{
    public ProductRepository(DbContext dbContext) : base(dbContext) { }
}

服务

public partial class ProductService : BaseService<Product>, IProductService
{
    private readonly IProductRepository _repository;
    private readonly IProductValidation _validation;
    private readonly IUnitOfWork _unitOfWork;
    public ProductService(IProductValidation validation, IProductRepository respository, IUnitOfWork unitOfWork)
        : base(validation, respository, unitOfWork)
    {
        _repository = respository;
        _validation = validation;
        _unitOfWork = unitOfWork;
    }
}

验证

public partial class ProductValidation : BaseValidation<Product>, IProductValidation
{
    private readonly IProductRepository _productRepository;

    public ProductValidation(IProductRepository productRepository) : base(productRepository)
    {
    }
}

启动

 public void ConfigureServices(IServiceCollection services)
    {
        services.AddDbContext<ECommerceDbContext>(options =>
           options.UseSqlServer(Configuration.GetConnectionString("DefaultConnection")));
        // Add framework services.
        services.AddMvc();


        services.AddTransient<IUnitOfWork, UnitOfWork>();
        services.AddTransient<IProductRepository, ProductRepository>();
        services.AddTransient<IProductService, ProductService>();
        services.AddTransient<IProductValidation, ProductValidation>();
    }

控制器

private readonly IProductService _productService;

    public ValuesController(IProductService productService)
    {
        _productService = productService;
    }
    // GET api/values
    [HttpGet]
    public IEnumerable<Product> Get()
    {
        return _productService.GetAll();
    }

请告诉我我的代码有什么问题。非常感谢

P / s：此代码在我之前使用Autofac

使用Asp .Net 4.6的项目中非常完美

Answer 1

根据您对其他答案的评论：

如果您确定应用中只有 ONE DbContext，则可以

services.AddScoped<DbContext, ECommerceDbContext>();

或

services.AddScoped<DbContext>(provider => provider.GetRequiredService<ECommerceDbContext>());

如果您不希望DbContext和ECommerceDbContext解析为两个不同的实例

Answer 2

您需要注入实际的DbContext类，在本例中为ECommerceDbContext。

所以将构造函数更改为：

public BaseRepository(ECommerceDbContext dbContext)
{
    _dbContext = dbContext;
    _dbSet = dbContext.Set<T>();
}

ASP .NET CORE 1.1.1依赖注入错误

2 个答案: