ASP.. NET MVC 5页面挂在数据库调用上

我正在尝试使用ASP启动和运行MVC 5项目。NET Identity 2.0。我的出发点是本教程中的示例应用程序。我的初始页面是Home/Index。当我尝试做一个搜索(期望一个null返回值)的应用程序只是挂起，我不知道为什么。db上下文的实例化导致调用Seed()方法，这似乎很正常，但随后它挂在roleManager.FindByName(roleName)调用上(我在下面的代码中注释了它)。暂停调试器显示它被卡住的地方，但我不知道从那里去哪里。相关类如下:

控制器:

public class HomeController : ApplicationController
{         
    public ActionResult Index()
    {
        var user = db.Users.Find("dummyVal");
        return View();
    }
    [Authorize]
    public ActionResult About()
    {
        ViewBag.Message = "Your app description page.";
        return View();
    }
    public ActionResult Contact()
    {
        ViewBag.Message = "Your contact page.";
        return View();
    }
}

基本控制器:

public abstract class ApplicationController : Controller
{
    protected ApplicationDbContext db;
    public ApplicationController()
    {
        db = new ApplicationDbContext();
    }
}

DB初始化:

public class ApplicationDbInitializer : DropCreateDatabaseAlways<ApplicationDbContext> 
{
    protected override void Seed(ApplicationDbContext context) {
        InitializeIdentityForEF(context);
        base.Seed(context);
    }
    //Create User=Admin@Admin.com with password=Admin@123456 in the Admin role        
    public static void InitializeIdentityForEF(ApplicationDbContext db) {
        var userManager = HttpContext.Current.GetOwinContext().GetUserManager<ApplicationUserManager>();
        var roleManager = HttpContext.Current.GetOwinContext().Get<ApplicationRoleManager>();
        const string name = "admin@example.com";
        const string password = "Admin@123456";
        const string roleName = "Admin";
        //Create Role Admin if it does not exist
        // EXECUTION HANGS ON THIS CALL...
        var role = roleManager.FindByName(roleName);
        if (role == null) {
            role = new IdentityRole(roleName);
            var roleresult = roleManager.Create(role);
        }
        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);
        }
        // Add user admin to Role Admin if not already added
        var rolesForUser = userManager.GetRoles(user.Id);
        if (!rolesForUser.Contains(role.Name)) {
            var result = userManager.AddToRole(user.Id, role.Name);
        }
        // Create dummy user
        const string dummyUserName = "PeterVenkman";
        const string dummyUserPwd = "gf%^^ftf83X";
        var dummyUser = userManager.FindByName(dummyUserName);
        if (dummyUser == null) { 
            dummyUser = new ApplicationUser { UserName = dummyUserName, Email = dummyUserName };
            var result = userManager.Create(dummyUser, dummyUserPwd);
            result = userManager.SetLockoutEnabled(dummyUser.Id, false);
        }
    }
}