在n层架构中使用带有依赖注入的ApplicationDbContext

Question

我有一个使用Asp.Net MVC Core 2.1构建的3层(Presentation - Business - Data)应用程序

在我的Presentation层中,我有一个ApplicationDbContext类,它实例化并填充测试数据库:

public class ApplicationDbContext : IdentityDbContext
{
    public ApplicationDbContext(DbContextOptions<ApplicationDbContext> options)
        : base(options)
    {
    }

    protected override void OnModelCreating(ModelBuilder builder)
    {
        base.OnModelCreating(builder);
        SeedData(builder);
    }

    // Database Tables
    public DbSet<Customer> Customers { get; set; }
    public DbSet<Ingredient> Ingredients { get; set; }
    public DbSet<Order> Orders { get; set; }
    public DbSet<OrderDetail> OrderDetails { get; set; }
    public DbSet<Pizza> Pizzas { get; set; }
    public DbSet<PizzaIngredient> PizzaIngredients { get; set; }

    // Fill Database with sample data
    private void SeedData(ModelBuilder builder)
    {
         // Seed data
    }

所述类在Startup.cs类中注入(也在表示层中):

        services.AddDbContext<ApplicationDbContext>(options => options.UseSqlServer(Configuration.GetConnectionString("DefaultConnection")));
        services.AddDefaultIdentity<IdentityUser>().AddEntityFrameworkStores<ApplicationDbContext>();
        services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Latest);

我现在想在数据层中使用这个ApplicationDbContext类来保持代码分离.我最好怎么做呢？通过构造函数注入类似乎不起作用(严重性代码描述项目文件行抑制状态错误CS0246找不到类型或命名空间名称'ApplicationDbContext'(您是否缺少using指令或程序集引用？))

namespace PizzaShop.Data.Repositories
{
   public class PizzaRepo : IPizzaRepo
   {
       private readonly ApplicationDbContext _context;

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

       public async Task<int> AddEntityAsync(Pizza entity)
       {
           _context.Pizzas.Add(entity);
           return await _context.SaveChangesAsync();
       }
    //...
   }
}

建筑:

Answer 1

如果您想在PizzaShop.Data项目中保留所有与数据库相关的内容,那么您ApplicationDbContext不属于您的Web项目.它属于您的PizzaShop.Data项目.

然后,您从Web项目中引用您的PizzaShop.Data项目.