System.AggregateException：“某些服务无法构造”ASP.NET核心

Question

我正在尝试将一个服务注入到另一个服务中，但我无法使它工作，在网上搜索了一下后，我还看不到解决方案。

这是确切的错误：

System.AggregateException：“无法构造某些服务（验证服务描述符”ServiceType：MyBank.services.ITRansactionService Lifetime：作用域实现类型：MyBank.services.TransactionService“时出错：尝试激活”MyBank.services.TransactionService“时无法解析类型”MyBank.services.AccountsService“的服务。）”

我有这样的服务：

public class AccountsService : IAccountsService

我想把它注入到另一个服务中：

public class TransactionService : ITransactionService
{
        private readonly ApplicationDbContext db;
        private readonly AccountsService accountsService;

        public TransactionService(ApplicationDbContext db, AccountsService accountsService)
        {
            this.db = db;
            this.accountsService = accountsService;
        }
}

这是我的Startup.cs服务区域：

        public void ConfigureServices(IServiceCollection services)
        {
            services.AddDbContext<ApplicationDbContext>(options =>
                options.UseSqlServer(
                    Configuration.GetConnectionString("DefaultConnection")));
            _ = services.AddDefaultIdentity<IdentityUser>(options => options.SignIn.RequireConfirmedAccount = false)
                .AddEntityFrameworkStores<ApplicationDbContext>();
            services.AddControllersWithViews().AddNewtonsoftJson(options =>
                options.SerializerSettings.ReferenceLoopHandling = Newtonsoft.Json.ReferenceLoopHandling.Ignore);
            services.AddRazorPages().
                AddRazorRuntimeCompilation();         
            services.AddScoped<IAccountsService, AccountsService>();
            services.AddScoped<ITransactionService, TransactionService>();
        }

Answer 1

您正在尝试将AccountsService（实现），而不是IAccountsService（接口）注入TransactionService。