AddIdentity()失败"InvalidOperationException:方案已经存在:Identity.Application". [英] AddIdentity() fails "InvalidOperationException: Scheme already exists: Identity.Application"

问题描述

我正在尝试将Facebook登录名添加到我的.NET Core 2.1站点

I'm trying to add facebook login to my .NET Core 2.1 site

我正在关注 this ，指南以及更具体的

I'm following this , guide and more specific, this (for facebook login)

将以下几行添加到startup.cs之后，在ConfigureServices-method之内

After have adding the lines below to startup.cs, inside ConfigureServices-method

public void ConfigureServices(IServiceCollection services)
{
    ...
    services.AddIdentity<ApplicationUser, IdentityRole>()
            .AddEntityFrameworkStores<ApplicationDbContext>()
            .AddDefaultTokenProviders();
    ...
}

运行应用程序时收到错误消息.没有这些行，它正常"工作.用户可以登录到Facebook并批准我的申请，然后我收到电子邮件，但没有收到.但是我猜用户信息不会被添加到我的数据库中

I get the error message, when I'm running the application. Without these lines it works "ok". The user can login to facebook and approve my application and I get email and what not. BUT I'm guessing the user information will not be added to my database

InvalidOperationException:方案已经存在:Identity.Application Microsoft.AspNetCore.Authentication.AuthenticationOptions.AddScheme(字符串 名称，操作configureBuilder)...

InvalidOperationException: Scheme already exists: Identity.Application Microsoft.AspNetCore.Authentication.AuthenticationOptions.AddScheme(string name, Action configureBuilder)...

代码超出了添加的行，并且不久(启动期间)后出现错误.我已经搜索了我的项目(从模板开始只是一个裸露的.NET Core 2.1 Web应用程序)，但是看不到"AddIdentity"的任何其他用法.

The code goes past the added lines and the error appears after a short while (during startup). I have searched in my project (which is just a bare .NET Core 2.1 Web application, from template) and I cant see any other usages of "AddIdentity".

我确实找到了"AddDEfaultIdentity()"，将该行注释掉了.但后来我得到了

I did find a "AddDEfaultIdentity()", commented that line out. but then I got

InvalidOperationException:没有针对该类型的服务 'Microsoft.AspNetCore.Identity.UserManager`1 [Microsoft.AspNetCore.Identity.IdentityUser]' 已注册. Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetRequiredService(IServiceProvider提供者，类型serviceType)

InvalidOperationException: No service for type 'Microsoft.AspNetCore.Identity.UserManager`1[Microsoft.AspNetCore.Identity.IdentityUser]' has been registered. Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetRequiredService(IServiceProvider provider, Type serviceType)

推荐答案

我遇到了类似的问题.这对于使用.Net Core 3.0的人们可能更有用.深入研究后，我发现一旦您使用脚手架创建身份"区域.在Identity文件夹中创建了一个名为"IdentityHostingStartup.cs"的文件.

I had a similar issue. This might be more helpful for people using .Net Core 3.0. After digging around I found out that once you create an "Identity" area using scaffolding. A file called "IdentityHostingStartup.cs" is created inside the Identity folder.

在类中，将创建"AddDefaultIdentity"的另一个实例以及其他一些服务.

Inside the class, another instance of "AddDefaultIdentity" is created along with a few other services.

如果从"Startup.cs"中删除"addDefaultIdentity"，则您的应用应启动.另外，如果收到空连接字符串错误.更新IdentityHostintgStartup.cs内部的连接字符串

If you remove the "addDefaultIdentity" from your "Startup.cs" your app should start. Also, If you are getting a null connection string error. Update the connection string inside of the IdentityHostintgStartup.cs

注意:删除两个addDefaultIdentities都可以.您只是不能在两个地方都拥有它.

Note: Deleting either of the addDefaultIdentities will work. You just can't have it in both locations.

希望这会有所帮助.

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