Question

在ASP.NET core 3.1中将DbContextOptionsBuilder注入CustomTicketStore时。我收到异常消息

某些服务无法构建（验证时出错服务描述符'ServiceType： Microsoft.AspNetCore.Authentication.Cookies.ITicketStore生命周期：作用域实施类型：OneIAM.Services.CustomTicketStore'：无法解决类型的服务 'Microsoft.EntityFrameworkCore.DbContextOptionsBuilder`1 [OneIAM.Data.ApplicationDbContext]' 尝试激活“ OneIAM.Services.CustomTicketStore”时。）

下面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，我测试了您的代码，发现它会用services.AddScoped<ITicketStore, CustomTicketStore>();重现您的错误这是我的CustomTicketStore：

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

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

        .......
    }

我发现如果我向CustomTicketStore添加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;
        }

        ........
    }

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

1 个答案: