public class ApplicationDbInitializer : DropCreateDatabaseIfModelChanges<ApplicationDbContext>
    {
        protected override void Seed(ApplicationDbContext context)
        {
            InitializeIdentityForEf();
            base.Seed(context);
        }
        private void InitializeIdentityForEf()
        {
            var userManager = HttpContext.Current.GetOwinContext().GetUserManager<ApplicationUserManager>();
            var roleManager = HttpContext.Current.GetOwinContext().Get<ApplicationRoleManager>();

            const string name = "admin@123.com";
            const string password = "Admin@123456";
            const string roleName = "Admin";
            //如果没有Admin用户组则创建该组
            var role = roleManager.FindByName(roleName);
            if (role == null)
            {
                role = new IdentityRole(roleName);
                var roleResult = roleManager.Create(role);
            }
            //如果没有admin@123.com用户则创建该用户
            var user = userManager.FindByName(name);
            if (user == null)
            {
                user = new ApplicationUser { UserName = name, Email = name };
                var result = userManager.Create(user, password);
                result = userManager.SetLockoutEnabled(user.Id, false);
            }

            //把admin@123.com用户添加到Admin用户组
            var roleForUser = userManager.GetRoles(user.Id);
            if (!roleForUser.Contains(role.Name))
            {
                var result = userManager.AddToRole(user.Id, role.Name);
            }
        }
    }

protected void Application_Start()
        {
            AreaRegistration.RegisterAllAreas();
            FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
            RouteConfig.RegisterRoutes(RouteTable.Routes);
            BundleConfig.RegisterBundles(BundleTable.Bundles);

            Database.SetInitializer(new ApplicationDbInitializer()); 
        }