c# - 实体类型 ApplicationRole 不是当前上下文模型的一部分。这不是重复的

Question

首先，有很多这样的问题，但这不是重复的，因为我的代码与其他代码确实不同。

我想使用 Asp.net MVC Identity 实现成员资格。但是我无法摆脱这个错误。让我们看一下代码:

IdentityStratup.cs

using System;
using System.Threading.Tasks;
using Microsoft.Owin;
using Owin;
using Microsoft.Owin.Security.Cookies;
using Microsoft.AspNet.Identity;
using Login.Models;

[assembly: OwinStartup(typeof(Login.App_Start.Startup))]

namespace Login.App_Start
{
    public class Startup
    {
        public void Configuration(IAppBuilder app)
        {
            // For more information on how to configure your application, visit http://go.microsoft.com/fwlink/?LinkID=316888
            app.UseCookieAuthentication(new CookieAuthenticationOptions
            {
                AuthenticationType = DefaultAuthenticationTypes.ApplicationCookie,
                LoginPath = new PathString("/Account/Login")
            });

            app.CreatePerOwinContext(MyDbContext.Create);

        }
    }
}

在身份文件夹下 -> ApplicationRole.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using Microsoft.AspNet.Identity.EntityFramework;

namespace Login.Identity
{
    public class ApplicationRole : IdentityRole
    {
        public string Description { get; set; }

        public ApplicationRole ()
        {

        }

        public ApplicationRole (string roleName, string description) : base(roleName)
        {
            this.Description = description;
        }
    }
}

在身份文件夹下 -> ApplicationUser.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using Microsoft.AspNet.Identity.EntityFramework;

namespace Login.Identity
{
    public class ApplicationUser : IdentityUser
    {
        public string Name { get; set; }
        public string Surname { get; set; }
    }
}

模型文件夹中的Login.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Web;

namespace Login.Models
{
    public class Login
    {
        [Required]
        [StringLength(50)]
        [RegularExpression(@"^(?=[a-zA-Z])[-\w.]{0,23}([a-zA-Z\d]|(?<![-.])_)$")]
        public string UserName { get; set; }

        [Required]
        [RegularExpression(@"^(?=.*[A-Za-z])(?=.*\d)[A-Za-z\d]{8,}$")]
        [DataType(DataType.Password)]
        public string Password { get; set; }

        [Required]
        [DisplayName("Remember Me")]
        public bool RememberMe { get; set; }
    }
}

模型文件夹中的Register.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Web;

namespace Login.Models
{
    public class Register
    {
        [Key]
        [Required]
        public int ID { get; set; }

        [Required]
        [StringLength(50)]
        [RegularExpression(@"^(([A-za-z]+[\s]{1}[A-za-z]+)|([A-Za-z]+))$")]
        public string Name { get; set; }

        [Required]
        [StringLength(50)]
        [RegularExpression(@"^(([A-za-z]+[\s]{1}[A-za-z]+)|([A-Za-z]+))$")]
        public string Surname { get; set; }

        [Required]
        [StringLength(50)]
        [RegularExpression(@"^(?=[a-zA-Z])[-\w.]{0,23}([a-zA-Z\d]|(?<![-.])_)$")]
        public string Username { get; set; }

        [Required]
        [EmailAddress]
        public string Email { get; set; }

        [Required]
        [RegularExpression(@"^(?=.*[A-Za-z])(?=.*\d)[A-Za-z\d]{8,}$")]
        [DataType(DataType.Password)]
        public string Password { get; set; }

        [Required]
        [RegularExpression(@"^(?=.*[A-Za-z])(?=.*\d)[A-Za-z\d]{8,}$")]
        [Compare("Password")]
        public string PasswordConfirmation { get; set; }
    }
}

Global.asasx

using Login.Identity;
using Login.Models;
using Microsoft.AspNet.Identity;
using Microsoft.AspNet.Identity.EntityFramework;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using System.Web.Routing;

namespace Login
{
    public class MvcApplication : System.Web.HttpApplication
    {
        protected void Application_Start()
        {
            AreaRegistration.RegisterAllAreas();
            RouteConfig.RegisterRoutes(RouteTable.Routes);

            MyDbContext db = new MyDbContext();
            RoleStore<ApplicationRole> roleStore = new RoleStore<ApplicationRole>(db);
            RoleManager<ApplicationRole> roleManager = new RoleManager<ApplicationRole>(roleStore);



                if (!roleManager.RoleExists("Admin"))
                {
                    ApplicationRole adminRole = new ApplicationRole("Admin", "System Admnistrator");
                    roleManager.Create(adminRole);
                }

                if (!roleManager.RoleExists("User"))
                {
                    ApplicationRole userRole = new ApplicationRole("User", "System Contraint User");
                    roleManager.Create(userRole);
                }


        }
    }
}

MyDbContext.cs

using Login.Identity;
using Microsoft.AspNet.Identity.EntityFramework;
using System;
using System.Collections.Generic;
using System.Data.Entity;
using System.Linq;
using System.Web;

namespace Login.Models
{
    public class MyDbContext : IdentityDbContext<ApplicationUser>
    {
        public MyDbContext() : base("name=LoginDBContext")
        {

        }

        public DbSet<Categories> Categories { get; set; }

        public static MyDbContext Create()
        {
            return new MyDbContext();
        }
    }
}

我给了你完整的申请。我无法解决这个问题标题中提到的这个问题。当我运行应用程序时，就在这行代码的 global.asasx 文件中抛出该异常 if (!roleManager.RoleExists("Admin"))。你怎么看待这个问题？

Answer 1

您正在使用名为 LoginDBContext 的上下文，但是您的身份数据库上下文名为 MyDbContext

将Application_Start的第三行改为

      MyDbContext db = new MyDbContext();