Question

因此，我正在遵循本教程：https://www.yogihosting.com/aspnet-core-identity-create-read-update-delete-users/教如何为身份用户制作CRUD。

我到了2个错误的地步。首先，我将介绍代码：

AdminController.cs

public ViewResult Create() => View();

[HttpPost]
public async Task<IActionResult> Create(User user)
{
    if (ModelState.IsValid)
    {
        AppUser appUser = new AppUser
        {
            UserName = user.Name,
            Email = user.Email
        };

        IdentityResult result = await userManager.CreateAsync(appUser, user.Password);
        if (result.Succeeded)
            return RedirectToAction("Index");
        else
        {
            foreach (IdentityError error in result.Errors)
                ModelState.AddModelError("", error.Description);
        }
    }
    return View(user);
}

AppUser.cs

public class AppUser : IdentityUser
{
}

在运行应用程序后访问“ localhost / Admin / Create”链接时，出现此错误：

InvalidOperationException：尝试激活“ Filters.Controllers.AdminController”时，无法解析类型为“ Microsoft.AspNetCore.Identity.UserManager`1 [Intersection.Models.AppUser]”的服务。

Microsoft.Extensions.DependencyInjection.ActivatorUtilities.GetService（IServiceProvider sp，Type type，type requiredBy，bool isDefaultParameterRequired）

然后，我发现 Startup.cs 中可能出了一些问题，因此，经过一些研究，我添加了以下行：services.AddIdentity<AppUser, IdentityRole>().AddEntityFrameworkStores<AppIdentityDbContext>().AddDefaultTokenProviders();

为解决第一个错误，我遇到了第二个问题：

HTTP错误500.30-ANCM进程内启动失败

我的 Startup.cs 类如下：

 public class Startup
{
    public Startup(IConfiguration configuration)
    {
        Configuration = configuration;
    }

    public IConfiguration Configuration { get; }

    // This method gets called by the runtime. Use this method to add services to the container.
    public void ConfigureServices(IServiceCollection services)
    {
        services.Configure<CookiePolicyOptions>(options =>
        {
            // This lambda determines whether user consent for non-essential cookies is needed for a given request.
            options.CheckConsentNeeded = context => true;
            options.MinimumSameSitePolicy = SameSiteMode.None;
        });

        services.AddDbContext<ApplicationDbContext>(options =>
            options.UseSqlServer(
                Configuration.GetConnectionString("DefaultConnection")));
        services.AddDefaultIdentity<IdentityUser>()
            .AddDefaultUI(UIFramework.Bootstrap4)
            .AddEntityFrameworkStores<ApplicationDbContext>();

        services.AddDbContext<AppIdentityDbContext>(options => options.UseSqlServer(Configuration["ConnectionStrings:DefaultConnection"]));
        services.AddIdentity<AppUser, IdentityRole>().AddEntityFrameworkStores<AppIdentityDbContext>().AddDefaultTokenProviders();
        services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_2);
    }

    // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
    public void Configure(IApplicationBuilder app, IHostingEnvironment env)
    {
        if (env.IsDevelopment())
        {
            app.UseDeveloperExceptionPage();
            app.UseDatabaseErrorPage();
        }
        else
        {
            app.UseExceptionHandler("/Home/Error");
            // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
            app.UseHsts();
        }

        app.UseHttpsRedirection();
        app.UseStaticFiles();
        app.UseCookiePolicy();

        app.UseAuthentication();

        app.UseMvc(routes =>
        {
            routes.MapRoute(
                name: "default",
                template: "{controller=Home}/{action=Index}/{id?}");
        });
    }
}

那么可能是什么问题？我尝试了紧跟本教程，但显然我漏掉了一些东西。非常感谢您的帮助！

Answer 1

HTTP错误500.30-ANCM进程内启动失败

这是由于方法AddDbContext和AddIdentity在 Startup.cs 中重复。在注释掉重复项之后，我将其删除。

其次，在 _LoginPartial.cshtml 中，我有以下内容：

@inject SignInManager<IdentityUser> SignInManager
@inject UserManager<IdentityUser> UserManager

我不得不用IdentityUser替换AppUser。这解决了第一个错误。

切换到“创建”视图时出现身份问题

1 个答案: