无法解析类型“Microsoft.EntityFrameworkCore.DbContextOptionsBuilder”的服务

Question

当我将 DbContextOptionsBuilder 注入 ASP.NET 核心 3.1 中的 CustomTicketStore 时。我收到异常消息

Some services are not able to be constructed (Error while validating the service descriptor 'ServiceType: Microsoft.AspNetCore.Authentication.Cookies.ITicketStore Lifetime: Scoped ImplementationType: OneIAM.Services.CustomTicketStore': Unable to resolve service for type 'Microsoft.EntityFrameworkCore.DbContextOptionsBuilder`1[OneIAM.Data.ApplicationDbContext]' while attempting to activate 'OneIAM.Services.CustomTicketStore'.)

以下是启动文件中的代码。

        public virtual void ConfigureServices(IServiceCollection services)
        {
          ...

          // Persistent ticket/cookie store to provide durable user sessions
          services.AddScoped<ITicketStore, CustomTicketStore>();
          var optionsBuilder = GetDbContextOptionsBuilder(services);

          services.ConfigureApplicationCookie(options =>
          {
            options.SlidingExpiration = true;
            options.SessionStore = new CustomTicketStore(optionsBuilder);  <=
          });
        }

        private static DbContextOptionsBuilder<ApplicationDbContext> GetDbContextOptionsBuilder(IServiceCollection services)
        {
            using (var scope = services.BuildServiceProvider().CreateScope())
            {
                return scope.ServiceProvider.GetService<DbContextOptionsBuilder<ApplicationDbContext>>();
            }
        }

Answer 1

首先，我测试了你的代码，发现它会用 services.AddScoped<ITicketStore, CustomTicketStore>(); 重现你的错误 这是我的 CustomTicketStore：

public class CustomTicketStore: ITicketStore
    {
        private readonly DbContextOptionsBuilder<ApplicationDbContext> _optionsBuilder;
        

        public CustomTicketStore(DbContextOptionsBuilder<ApplicationDbContext> optionsBuilder)
        {
            _optionsBuilder = optionsBuilder;
        }

        .......
    }

而且我发现如果我向 CustomTicketStore 添加一个不带参数的构造函数，它将起作用：

public class CustomTicketStore: ITicketStore
    {
        private readonly DbContextOptionsBuilder<ApplicationDbContext> _optionsBuilder;
        public CustomTicketStore()
        {
        }

        public CustomTicketStore(DbContextOptionsBuilder<ApplicationDbContext> optionsBuilder)
        {
            _optionsBuilder = optionsBuilder;
        }

        ........
    }