MVC4：支持'SisContext'上下文的模型自创建数据库以来已发生变化。考虑使用Code First Migration来更新数据库

Question

之前我也问了这个问题，但是我又发了一遍，希望我可以得到帮助 在这里

当我尝试使用数据库（SIS）中提供的详细信息登录时，出现此错误。

The model backing the 'SisContext' context has changed since the database was created. Consider using Code First Migrations to update the database. Thing is Database(SIS) was manually added using add existing item and not generated automatically and when I click on show all files button on solution explorer after running application, i get new database called`ASPNETDB.mdf`

我的SisContext看起来像这样

public class SisContext : DbContext
    {
        //protected override void OnModelCreating(DbModelBuilder modelBuilder)
        //{
        //    modelBuilder.Conventions.Remove<System.Data.Entity.Infrastructure.IncludeMetadataConvention>();
        //}
        public DbSet<User> Users { get; set; }
        public DbSet<AspNetUser> AspNetUsers { get; set; }
        public DbSet<Role> Roles { get; set; }
        public DbSet<BusinessUnit> BusinessUnits { get; set; }
        public DbSet<LicenseHolder> LicenseHolders { get; set; }
        public DbSet<License> Licenses { get; set; }

        public SisContext():base("SIS")
        {
            if (HttpContext.Current == null)
            {
                Database.SetInitializer<SisContext>(null);
            }
        }
    }

我有另一个名为DataContextInitializer的类，看起来像这样

public class DataContextInitializer:DropCreateDatabaseAlways<SisContext>
    {
        protected override void Seed(SisContext context)
        {
        WebSecurity.Register("Demo", "123456", "demo@demo.com", true, "Demo", "Demo");
        Roles.CreateRole("Admin");
        Roles.AddUserToRole("Demo", "Admin");
        }
    }

在我的AccountController中，Login方法如下;

 public class AccountController : Controller
    {

        //
        // GET: /Account/
        [HttpGet]
        public ActionResult Login()
        {
            return View();
        }

        [HttpPost]
        [AllowAnonymous]
        public ActionResult Login(LoginModel model)
        {
            if(Membership.ValidateUser(model.UserName, model.Password))
            {
                FormsAuthentication.SetAuthCookie(model.UserName, model.RememberMe);
                return RedirectToAction("Index", "Home");
            }
            ModelState.AddModelError("", "The user name or password provided is incorrect.");
            return View(model);
        }

        public ActionResult Index()
        {
            return View();
        }

    }

上述ValidateUser操作中使用的

Login方法位于继承自CodeFirstMembershipProvider

的类MembershipProvider类中

 public override bool ValidateUser(string username, string password)
        {
            if (string.IsNullOrEmpty(username))
            {
                return false;
            }
            if (string.IsNullOrEmpty(password))
            {
                return false;
            }
            using (SisContext Context = new SisContext())
            {
                AspNetUser User = null;
                User = Context.AspNetUsers.FirstOrDefault(Usr => Usr.Username == username);//error mentioned above is shown here
                if (User == null)
                {
                    return false;
                }
                if (!User.IsApproved)
                {
                    return false;
                }
                if (User.IsLockedOut)
                {
                    return false;
                }
                String HashedPassword = User.Password;
                Boolean VerificationSucceeded = (HashedPassword != null && Crypto.VerifyHashedPassword(HashedPassword, password));
                if (VerificationSucceeded)
                {
                    User.PasswordFailuresSinceLastSuccess = 0;
                    User.LastLoginDate = DateTime.UtcNow;
                    User.LastActivityDate = DateTime.UtcNow;
                }
                else
                {
                    int Failures = User.PasswordFailuresSinceLastSuccess;
                    if (Failures < MaxInvalidPasswordAttempts)
                    {
                        User.PasswordFailuresSinceLastSuccess += 1;
                        User.LastPasswordFailureDate = DateTime.UtcNow;
                    }
                    else if (Failures >= MaxInvalidPasswordAttempts)
                    {
                        User.LastPasswordFailureDate = DateTime.UtcNow;
                        User.LastLockoutDate = DateTime.UtcNow;
                        User.IsLockedOut = true;
                    }
                }
                Context.SaveChanges();
                if (VerificationSucceeded)
                {
                    return true;
                }
                else
                {
                    return false;
                }
            }
        }

在我的网页配置中，我添加了我的custommembershipProvider

 <membership defaultProvider="CodeFirstMembershipProvider">
      <providers>
        <clear />
        <add name="CodeFirstMembershipProvider" type="Sorama.CustomAuthentication.CodeFirstMembershipProvider" connectionStringName="SisContext" />
      </providers>
    </membership>
    <roleManager enabled="true" defaultProvider="CodeFirstRoleProvider">
      <providers>
        <clear />
        <add name="CodeFirstRoleProvider" type="Sorama.CustomAuthentication.CodeFirstRoleProvider" connectionStringName="SisContext" />
      </providers>
    </roleManager>

    <!--<httpModules>
      <add name="PerRequestLifestyle" type="Castle.MicroKernel.Lifestyle.PerWebRequestLifestyleModule, Castle.Windsor" />
      <add name="DomainServiceModule" type="System.ServiceModel.DomainServices.Hosting.DomainServiceHttpModule, System.ServiceModel.DomainServices.Hosting, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
    </httpModules>-->
    <httpRuntime maxRequestLength="2147483647" executionTimeout="180" />
    <httpModules>
      <add name="DomainServiceModule" type="System.ServiceModel.DomainServices.Hosting.DomainServiceHttpModule, System.ServiceModel.DomainServices.Hosting, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
    </httpModules>
  </system.web>
  <connectionStrings>
    <add name="SISContext" connectionString="Data Source=(LocalDB)\v11.0;attachdbfilename=|DataDirectory|\SIS.mdf;integrated security=True;connect timeout=30;MultipleActiveResultSets=True;App=EntityFramework" providerName="System.Data.SqlClient" />
  </connectionStrings>