Question

当尝试使用实体框架核心添加新用户时，出现上述错误代码。我知道之前已经有人问过这个问题，但是我无法用到目前为止找到的解决方案解决问题。

我正在尝试使用asp.net身份创建具有用户名（电子邮件）和密码的用户，但我不断收到以下错误消息：

“ InvalidOperationException：无法为其创建DbSet “ ApplicationUser”，因为此类型未包含在上下文。”

我尝试弄乱了startup.cs文件和Model.BlogContext文件如此处在多个线程上所建议的，但似乎无法绕开此消息。

我对此很陌生，很抱歉，如果我的问题不清楚。

这是我的代码-

ApplicationContext：

命名空间Blog3Prog.Models { 类消息 { [键] 公共诠释MessageId {组; } 公用字符串UserName {get;组; } 公共字符串FullMessage {get;组; }

}
class Timeline
{
    [Key]
    public int UserId { get; set; }
    public int Posts { get; set; }
    public string Username { get; set; }
}
public class BlogContext : IdentityDbContext<ApplicationUser>
{
    public BlogContext(DbContextOptions<DbContext> options) : base()
    {

    }
        protected override void OnConfiguring(DbContextOptionsBuilder 
optionsBuilder)
        {

            optionsBuilder.UseSqlServer(@"Data Source= 
(localdb)\MSSQLLocalDB;Initial Catalog=master;Integrated 
Security=True;Connect 
Timeout=30;Encrypt=False;TrustServerCertificate=False; 
ApplicationIntent=ReadWrite;MultiSubnetFailover=False; Database=BlogProject 
;Trusted_Connection=True");
        }
        private DbSet<Message> Messages { get; set; }
        private DbSet<Timeline> Timelines { get; set; }
        private DbSet<ApplicationUser> applicationUsers { get; set; }
        public DbSet<Microsoft.AspNetCore.Identity.IdentityUserClaim<Guid>> 
IdentityUserClaims { get; set; }
        public DbSet<IdentityUserClaim<string>> IdentityUserClaim { get; 
set; }
        public new DbSet<ApplicationUser> Users { get; set; }
        protected override void OnModelCreating(ModelBuilder modelBuilder)
        {

        }
    }
}

Startup.cs：

namespace Blog3Prog
{

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.AddDbContext<BlogContext>(options =>
 options.UseSqlServer(@"Data Source=(localdb)\MSSQLLocalDB;Initial 
Catalog=master;Integrated Security=True;Connect 

Timeout=30;Encrypt=False;TrustServerCertificate=False; 
ApplicationIntent=ReadWrit 
e;MultiSubnetFailover=False; Database=BlogProject 
;Trusted_Connection=True"));

        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.AddSingleton<IHttpContextAccessor, HttpContextAccessor>();

        services.AddIdentity<Blog3Prog.Models.ApplicationUser, 
IdentityRole> ()
            .AddEntityFrameworkStores<DbContext>()
            .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();
        }
        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.UseMvc(routes =>
        {
            routes.MapRoute(
                name: "default",
                template: "{controller=Account}/{action=Login}/{id?}");
        });
        app.UseAuthentication();
    }
  }
}

控制器：

namespace Blog3Prog.Controllers
{
public class AccountController : Controller
{

    public readonly UserManager<ApplicationUser> _userManager;
    public readonly SignInManager<ApplicationUser> _signInManager;
    public readonly Models.BlogContext _context;

    public AccountController(UserManager<ApplicationUser> userManager
                            ,SignInManager<ApplicationUser> signInManager
                            , Models.BlogContext context)
    {
        _userManager = userManager;
        _signInManager = signInManager;
        _context = context;

    }
    [HttpGet]
    public IActionResult Register()
    {

        return View();
    }

    [HttpPost]
    public async Task<IActionResult> Register(RegisterViewModel vModel)
    {
        if (ModelState.IsValid)
        {
            var user = new ApplicationUser { UserName = vModel.UserEmail, Email = vModel.UserEmail };
            var result = await _userManager.CreateAsync(user, vModel.Password);
            if (result.Succeeded)
            {
                //await _signInManager.SignInAsync(user, false);
                //return RedirectToAction("Index", "Home");
            }
            else
            {
                foreach (var error in result.Errors)
                {
                    ModelState.AddModelError("", error.Description);
                }
            }
        }
        return View(vModel);
    }



    public IActionResult Login()
    {
        return View("Login");
    }
  }
}

查看

<h2>Registration Page</h2>

<form method="post" asp-controller="Account" asp-action="Register">
<div asp-validation-summary="All"></div>
<div>
    <label asp-for="UserEmail"></label>
    <input asp-for="UserEmail" />
    <span asp-validation-for="UserEmail"></span>
</div>
<div>
    <label asp-for="Password"></label>
    <input asp-for="Password" />
    <span asp-validation-for="Password"></span>
</div>
<div>
    <label asp-for="ConfirmPassword"></label>
    <input asp-for="ConfirmPassword" />
    <span asp-validation-for="ConfirmPassword"></span>
</div>
<div>
    <input type="submit" value="Register" />
</div>


</form>

ApplicationUser.cs

using Microsoft.AspNetCore.Identity;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace Blog3Prog.Models
{
  public class ApplicationUser:IdentityUser
  {
    public int UserId { get; set; }
    public string UserEmail { get; set; }
    public DateTime CreatedOn { get; set; }
    public int Points { get; set; }
  }
}

Answer 1

这给了我错误消息：“没有隐式引用从'Blog3Prog.Models.BlogContext'转换为 “ Microsoft.EntityFrameworkCore.DbContext”。

出现此行为是因为BlogContext没有继承IdentityDbContext

以下是我的示例。该示例在我的本地工作。用ApplicationUser更改User并添加其他模型。

public class BlogContext : IdentityDbContext<User>
    {
        public BlogContext(DbContextOptions options) : base()
        {

        }
        public DbSet<User> Users { get; set; }
    }

public class User:IdentityUser
    {
    }

这应该添加到“配置服务”方法中。

services.AddDbContext<BlogContext>(options =>
                options.UseSqlServer("Your connection string");

我认为像您一样创建数据库上下文是一个坏主意。

也请从启动中删除下一个：

services.AddScoped<BlogContext>();
services.AddScoped<DbContext>();

可以通过以下方式重构BlogContext.cs：

public class BlogContext : IdentityDbContext<ApplicationUser>
    {
        public BlogContext(DbContextOptions options) : base()
        {

        }

        public DbSet<Message> Messages { get; set; }
        public DbSet<Timeline> Timelines { get; set; }
        public DbSet<ApplicationUser> applicationUsers { get; set; }
        public DbSet<IdentityUserClaim<Guid>> IdentityUserClaims { get; set; }
        public DbSet<IdentityUserClaim<string>> IdentityUserClaim
        {
            get;
            set;
        }

    }

无法为“ ApplicationUser”创建DbSet，因为此类型不包含在上下文模型中

1 个答案: