實體類型ApplicationRole不是當前上下文的模型的一部分。這不是重複的

Question

首先，有很多類似的問題，但這不是重複的，因爲我的代碼比其他代碼真的不同。

我想要實現使用Asp.net MVC身份會員。但我不能接受這個錯誤。讓我們來看看代碼：

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); 

     } 
    } 
} 

在標識文件夾 - >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; 
     } 
    } 
} 

在標識文件夾 - >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; } 
    } 
} 

Login.cs在Models文件夾

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; } 
    } 
} 

Register.cs在Models文件夾

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); 
       } 


     } 
    } 
} 

個

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(); 
     } 
    } 
} 

我給你充分應用。我無法解決此問題標題中提到的這個問題。當我運行該應用程序時，會在代碼爲 if (!roleManager.RoleExists("Admin"))的這一行中的global.asasx文件中引發該exeption。你對這個問題有什麼看法？

Answer 1

您正在使用一個名爲LoginDBContext背景，但是你的身份DB上下文被命名爲MyDbContext

變化的Application_Start到

 MyDbContext db = new MyDbContext();