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[英]Cannot resolve scoped service 'Microsoft.AspNetCore.Identity.UserManager`1[IdentityServerSample.Models.ApplicationUser]' from root provider
[英]ASP.NET Core 3: Cannot resolve scoped service 'Microsoft.AspNetCore.Identity.UserManager`1[Alpha.Models.Identity.User]' from root provider
運行項目時,遇到這個問題:(我用過asp.net core 3
。)
無法從根提供程序解析范圍服務“Microsoft.AspNetCore.Identity.UserManager`1[Alpha.Models.Identity.User]”。
我怎么解決這個問題?
ApplicationDbContext class:
public class ApplicationDbContext : IdentityDbContext<User, Role, int,
UserClaim, UserRole, UserLogin, RoleClaim, UserToken>
{
public ApplicationDbContext(DbContextOptions<ApplicationDbContext> options) : base(options)
{
}
public static async Task CreateAdminAccount(IServiceProvider
serviceProvider, IConfiguration configuration)
{
UserManager<User> userManager =
serviceProvider.GetRequiredService<UserManager<User>>();
RoleManager<Role> roleManager =
serviceProvider.GetRequiredService<RoleManager<Role>>();
string userName = configuration["Data:AdminUser:Name"];
string email = configuration["Data:AdminUser:Email"];
string password = configuration["Data:AdminUser:Password"];
string role = configuration["Data:AdminUser:Role"];
if (await userManager.FindByNameAsync(userName) == null)
{
if (await roleManager.FindByNameAsync(role) == null)
{
await roleManager.CreateAsync(new Role(role));
}
User user = new User
{
Email = email,
UserName = userName
};
var result = userManager.CreateAsync(user, password);
if (result.IsCompletedSuccessfully)
{
await userManager.AddToRoleAsync(user, role);
}
}
}
}
錯誤詳情:
啟動應用程序時發生錯誤。 AggregateException:發生一個或多個錯誤。 (無法從根提供程序解析范圍服務“Microsoft.AspNetCore.Identity.UserManager`1[Alpha.Models.Identity.User]”。) System.Threading.Tasks.Task.ThrowIfExceptional(bool includeTaskCanceledExceptions)
InvalidOperationException:無法從根提供程序解析范圍服務“Microsoft.AspNetCore.Identity.UserManager`1[Alpha.Models.Identity.User]”。 Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteValidator.ValidateResolution(類型 serviceType,IServiceScope scope,IServiceScope rootScope)
AggregateException:發生一個或多個錯誤。 (無法從根提供程序解析范圍服務“Microsoft.AspNetCore.Identity.UserManager`1[Alpha.Models.Identity.User]”。) System.Threading.Tasks.Task.ThrowIfExceptional(bool includeTaskCanceledExceptions) System.Threading.Tasks.Task Startup.cs + ApplicationDbContext.CreateAdminAccount(app.ApplicationServices, Configuration) 中的 .Wait(int millisecondsTimeout, CancellationToken cancelToken) System.Threading.Tasks.Task.Wait() )。等待(); System.RuntimeMethodHandle.InvokeMethod(object target, object[] arguments, Signature sig, bool constructor, bool wrapExceptions) System.Reflection.RuntimeMethodInfo.Invoke(object obj, BindingFlags invokeAttr, Binder binder, object[] parameters, CultureInfoculture) Microsoft。 AspNetCore.Hosting.ConfigureBuilder.Invoke(對象實例,IApplicationBuilder 構建器)Microsoft.AspNetCore.Hosting.ConfigureBuilder+<>c__DisplayClass4_0.b__0(IApplicationBuilder 構建器)Microsoft.AspNetCore.Hosting.GenericWebHostBuilder+<>c__DisplayClass13_0.b__2(IApplicationBuilder 應用程序)Microsoft.AspNetCore。 Mvc.Filters.MiddlewareFilterBuilderStartupFilter+<>c__DisplayClass0_0.g__MiddlewareFilterBuilder|0(IApplicationBuilder builder) Microsoft.AspNetCore.Server.IIS.Core.IISServerSetupFilter+<>c__DisplayClass2_0.b__0(IApplicationBuilder app) Microsoft.AspNetCore.HostFilteringStartupFilter+(IcApplicationBuilder app)0_0.StartupFilter+(IcApplicationBuilder app)0_0.StartupFilter+微軟.AspNetCo re.Hosting.GenericWebHostService.StartAsync(CancellationToken cancelToken) Microsoft.Extensions.Hosting.Internal.Host.StartAsync(CancellationToken cancelToken) Microsoft.Extensions.Hosting.HostingAbstractionsHostExtensions.RunAsync(IHost host, CancellationToken token) Microsoft.Extensions.Hosting.HostingAbstractionsHostExtensions。 RunAsync(IHost 主機,CancellationToken 令牌)Microsoft.Extensions.Hosting.HostingAbstractionsHostExtensions.Run(IHost 主機)Alpha.Web.App.Program.Main(string[] args) 在 Program.cs + CreateHostBuilder(args).Build()。跑();
顯示原始異常詳細信息 InvalidOperationException:無法從根提供程序解析范圍服務“Microsoft.AspNetCore.Identity.UserManager`1[Alpha.Models.Identity.User]”。 Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteValidator.ValidateResolution(類型 serviceType,IServiceScope scope,IServiceScope rootScope)Microsoft.Extensions.DependencyInjection.ServiceProvider.Microsoft.Extensions.DependencyInjection.ServiceLookup.IServiceProviderEngineCallback.OnResolve(類型 serviceType,IServiceScope 范圍)Microsoft。 .DependencyInjection.ServiceLookup.ServiceProviderEngine.GetService(Type serviceType, ServiceProviderEngineScope serviceProviderEngineScope) Microsoft.Extensions.DependencyInjection.ServiceLookup.ServiceProviderEngineScope.GetService(Type serviceType) Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetRequiredService(IServiceProvider provider, Type serviceType) Microsoft.Extensions。 DependencyInjection.ServiceProviderServiceExtensions.GetRequiredService(IServiceProvider provider) Alpha.DataAccess.ApplicationDbContext.CreateAdminAccount(IServiceProvider serviceProvider, IC onfiguration 配置)在 ApplicationDbContext.cs + UserManager userManager = serviceProvider.GetRequiredService>();
顯示原始異常詳細信息 System.InvalidOperationException:無法從根提供商解析范圍服務“Microsoft.AspNetCore.Identity.UserManager`1[Alpha.Models.Identity.User]”。 在 Microsoft.Extensions.DependencyInjection.ServiceProvider.Microsoft.Extensions.DependencyInjection.ServiceLookup.IServiceProviderEngineCallback.OnResolve(鍵入 serviceType,IServiceScope scope,IServiceScope rootScope)處的 Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteValidator.ValidateResolution(鍵入 serviceType,IServiceScope 范圍) Microsoft.Extensions.DependencyInjection.ServiceLookup.ServiceProviderEngine.GetService(類型 serviceType,ServiceProviderEngineScope serviceProviderEngineScope)
在 Microsoft.Extensions.DependencyInjection.ServiceLookup.ServiceProviderEngineScope.GetService(Type serviceType) 在 Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetRequiredService(IServiceProvider provider, Type serviceType) 在 Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetRequiredService[T](IServiceProvider provider)在 E:\Archives\Projects\Alpha\Alpha.DataAccess\ApplicationDbContext.cs:line 92 .NET Core 3.0.0 X64 v4.0.0.0 中的 Alpha.DataAccess.ApplicationDbContext.CreateAdminAccount(IServiceProvider serviceProvider, IConfiguration 配置) | Microsoft.AspNetCore.Hosting 版本 3.0.0-rc2.19465.2 | 微軟 Windows 10.0.17763 |
需要幫忙?
從您包含的屏幕截圖中,它表明您在Startup.Configure
中有以下行:
ApplicationDbContext.CreateAdminAccount(app.ApplicationServices, Configuration)
.Wait();
存儲在IApplicationBuilder.ApplicationServices
中的IServiceProvider
實例是應用程序的根服務提供者。 錯誤消息指出它無法從根服務提供商解析范圍服務。
這個問題經常出現,但最簡單的解決方案是將IServiceProvider
注入您的Configure
方法並將其傳遞給CreateAdminAccount
:
public void Configure(IApplicationBuilder app, IServiceProvider serviceProvider)
{
ApplicationDbContext.CreateAdminAccount(serviceProvider, Configuration)
.Wait();
}
傳遞給Configure
的IServiceProvider
實例是scoped ,這意味着您可以使用它來創建范圍服務。
這就是完成這項工作所需的全部內容,但在Program
中進行這種類型的播種更為典型。 這使播種問題與配置管道分開,並且還允許使用async
/ await
。 這是一個例子:
public class Program
{
public static async Task Main(string[] args)
{
var host = CreateHostBuilder(args).Build();
using (var scope = host.Services.CreateScope())
{
var serviceProvider = scope.ServiceProvider;
var config = serviceProvider.GetRequiredService<IConfiguration>();
await ApplicationDbContext.CreateAdminAccount(serviceProvider, config);
}
await host.RunAsync();
}
public static IHostBuilder CreateHostBuilder(string[] args) =>
// ...
}
您也可以在Main
中解析UserManager<User>
和RoleManager<Role>
,並將它們傳遞給CreateAdminAccount
而不是讓它使用服務定位器方法。
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