无法从根提供程序解析作用域服务"Microsoft.AspNetCore.Identity.UserManager'1[IdentityServerSample.Models.Application

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();
...
}

这就是我遇到的错误

Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteValidator.ValidateResolution(Type 服务类型，服务提供者服务提供者( Microsoft.Extensions.DependencyInjection.ServiceProvider.GetService(Type 服务类型( IdentityServerSample.MongoDbStartup.UseMongoDbForIdentityServer(IApplicationBuilder app(在MongoDbStartup中.cs

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

IdentityServerSample.Startup.Configure(IApplicationBuilder app， IHostingEnvironment env(在启动.cs

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 建造者( Microsoft.ApplicationInsights.AspNetCore.ApplicationInsightsStartupFilter+<>c__DisplayClass0_0.b__0(IApplicationBuilder 应用( Microsoft.AspNetCore.Server.IISIntegration.IISSetupFilter+<>c__DisplayClass3_0.b__0(IApplicationBuilder 应用( Microsoft.AspNetCore.Hosting.Internal.AutoRequestServicesStartupFilter+<>c__DisplayClass0_0.b__0(IApplicationBuilder 建造者( Microsoft.AspNetCore.Hosting.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

需要一个作用域来解析注册为作用域的依赖项。要创建它，您可以使用以下内容：

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
}

Answer 2

如果您使用的是提供的 Asp netcore Identity (AppIdentityDbContext(，则可以尝试将 validateScope 更改为生产环境(如果您在开发中，在程序.cs中：

webBuilder.UseContentRoot(Directory.GetCurrentDirectory());
webBuilder.UseIISIntegration();
webBuilder.UseDefaultServiceProvider((context, options) =>
{
options.ValidateScopes = context.HostingEnvironment.IsProduction();
});