无法从根提供者解析作用域服务'Microsoft.AspNetCore.Identity.UserManager`1 [IdentityServerSample.Models.ApplicationUser]'

Question

我正在扩展身份服务器以使用自定义身份服务器实现

 public static void UseMongoDbForIdentityServer(this IApplicationBuilder app)
    {

        //Resolve Repository with ASP .NET Core DI help 
        var repository = (IRepository)app.ApplicationServices.GetService(typeof(IRepository));

        //Resolve ASP .NET Core Identity with DI help
        var userManager = (UserManager<ApplicationUser>)app.ApplicationServices.GetService(typeof(UserManager<ApplicationUser>));

        // --- Configure Classes to ignore Extra Elements (e.g. _Id) when deserializing ---
        ConfigureMongoDriver2IgnoreExtraElements();

        var createdNewRepository = false;

        ...
}

这是我的启动文件的样子

      public void ConfigureServices(IServiceCollection services)
    {
        services.Configure<ConfigurationOptions>(Configuration);
     ...

        services.AddIdentityServer(
                  options =>
                  {
                      options.Events.RaiseSuccessEvents = true;
                      options.Events.RaiseFailureEvents = true;
                      options.Events.RaiseErrorEvents = true;
                  }
              )
              .AddMongoRepository()
              .AddMongoDbForAspIdentity<ApplicationUser, IdentityRole>(Configuration)
              .AddClients()
              .AddIdentityApiResources()
              .AddPersistedGrants()
            .AddDeveloperSigningCredential();
      ...

    }

这是我得到的错误

可选

   var userManager = (UserManager<ApplicationUser>)app.ApplicationServices.GetService(typeof(UserManager<ApplicationUser>));

Startup.cs中的IdentityServerSample.Startup.Configure（IApplicationBuilder应用程序，IHostingEnvironment env）

            app.UseMongoDbForIdentityServer();

System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw（）Microsoft.AspNetCore.Hosting.ConventionBasedStartup.Configure（IApplicationBuilder应用）Microsoft.AspNetCore.ApplicationInsights.HostingStartup.ApplicationInsightsLoggerStartupFilter + <> c__DisplayClass0_0.b__0（IApplicationBuilder构建器） > c__DisplayClass0_0.b__0（IApplicationBuilder应用程序）Microsoft.AspNetCore.Server.IISIntegration.IISSetupFilter + <> c__DisplayClass3_0.b__0（IApplicationBuilder应用程序）Microsoft.AspNetCore.Hosting.Internal.AutoRequestServicesStartupFilter + <> c__DisplayClass0_0.b__0（IApplicationBuilder构建器） Internal.WebHost.BuildApplication（）

我知道有人问过类似的问题，但似乎没有一个能解决我的问题

Answer 1

您需要一个作用域来解决注册为作用域的依赖项。要创建它，可以使用以下命令：

using(var scope = app.ApplicationServices.CreateScope())
{
    //Resolve ASP .NET Core Identity with DI help
    var userManager = (UserManager<ApplicationUser>)scope.ServiceProvider.GetService(typeof(UserManager<ApplicationUser>));
    // do you things here
}