ASP.NET Core 2-身份-具有自定义角色的DI错误 [英] ASP.NET Core 2 - Identity - DI errors with custom Roles

问题描述

我在Startup.cs中获得了以下代码：

I got this code in my Startup.cs:

 services.AddDbContext<ApplicationDbContext>(options =>
            options.UseSqlServer(Configuration.GetConnectionString("DefaultConnection")));

        services.AddIdentity<ApplicationUser, ApplicationRole>()
            .AddEntityFrameworkStores<ApplicationDbContext>()
            .AddDefaultTokenProviders();

在同一文件中，我还替换了 service.UseIdentity（）和 app.UseAuthentication（）; ，这是MS在新版ASP Core 2中的建议。

In that same file, I also replaced the service.UseIdentity() with app.UseAuthentication(); as recommended by MS in the new version of ASP Core 2.

我的Db上下文：

 public class ApplicationDbContext : IdentityDbContext<ApplicationUser, ApplicationRole, string>
{
    public ApplicationDbContext(DbContextOptions<ApplicationDbContext> options)
        : base(options)
    {
    }

    protected override void OnModelCreating(ModelBuilder builder)
    {
        base.OnModelCreating(builder);
        // Customize the ASP.NET Identity model and override the defaults if needed.
        // For example, you can rename the ASP.NET Identity table names and more.
        // Add your customizations after calling base.OnModelCreating(builder);
    }


    //public DbSet<ApplicationUser> ApplicationUser { get; set; }

    //public DbSet<ApplicationRole> ApplicationRole { get; set; }
}

我的自定义角色类别：

 public class ApplicationRole : IdentityRole
{
    public ApplicationRole() : base() { }

    public ApplicationRole(string roleName) : base(roleName) { }

    public bool IsDefault { get; set; }
}

在运行应用程序时，我得到了一个运行的SeedDatabase帮助器方法： / p>

When running the application, I got a SeedDatabase helper method that runs:

var roleManager = serviceProvider.GetService<RoleManager<ApplicationRole>>();

这一切都很好，但是由于将VS 2017更新到最新版本并安装了.NET Core 2.0 ，这最后一行代码现在引发以下异常：

This was all working fine, but since updating VS 2017 to the lastest version and installing .NET Core 2.0, this last line of code now throws the following exception:

System.AggregateException occurred
HResult=0x80131500
Message=One or more errors occurred. (Cannot resolve scoped service 'Microsoft.AspNetCore.Identity.RoleManager`1[CspLicensingPortal.Models.ApplicationRole]' from root provider.)
Source=<Cannot evaluate the exception source>
StackTrace:
at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
at System.Threading.Tasks.Task.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken)
at System.Threading.Tasks.Task.Wait()
at CspLicensingPortal.Startup.Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory) in D:\gsandorx\Documents\Visual Studio 2017\Projects\CspLicensingPortal\CspLicensingPortal\Startup.cs:line 275

Inner Exception 1:
InvalidOperationException: Cannot resolve scoped service 'Microsoft.AspNetCore.Identity.RoleManager`1[MyApplication.Models.ApplicationRole]' from root provider.

我不确定为什么DI服务经理不再能够找到我的ApplicationRole类。我已经检查过，并且我所有的引用都在使用此类，而不是默认的IdentityRole。

I'm not sure why the DI service manager is no longer able to find my ApplicationRole class. I have checked and all my references are using this class and not the default IdentityRole.

有什么想法吗？

推荐答案

您必须自己创建IServiceScope。

You have to create the IServiceScope on your own.

为此，您必须替换

var roleManager = serviceProvider.GetService<RoleManager<ApplicationRole>>();

有

using (IServiceScope scope = app.ApplicationServices.CreateScope()) {
    RoleManager<IdentityRole> roleManager = scope.ServiceProvider.GetRequiredService<RoleManager<IdentityRole>>();

    // Seed database code goes here
}

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