Asp.net MVC 5 访问声明身份用户数据

我正在使用Entity Framework 5 Database First方法开发一个MVC 5 web应用程序.我使用OWIN对用户进行身份验证.下面显示了我在帐户控制器中的登录方法.

public ActionResult Login(LoginViewModel model, string returnUrl)
{
    if (ModelState.IsValid)
    {
        var user = _AccountService.VerifyPassword(model.UserName, model.Password, false);
        if (user != null)
        {
            var identity = new ClaimsIdentity(new[] { new Claim(ClaimTypes.Name, model.UserName), }, DefaultAuthenticationTypes.ApplicationCookie, ClaimTypes.Name, ClaimTypes.Role);

            identity.AddClaim(new Claim(ClaimTypes.Role, "guest"));
            identity.AddClaim(new Claim(ClaimTypes.GivenName, "A Person"));
            identity.AddClaim(new Claim(ClaimTypes.Sid, user.userID)); //OK to store userID here?

            AuthenticationManager.SignIn(new AuthenticationProperties
            {
                IsPersistent = model.RememberMe
            }, identity);

            return RedirectToAction("Index", "MyDashboard");
        }
        else
        {
            ModelState.AddModelError("", "Invalid username or password.");
        }
    }
    // If we got this far, something failed, redisplay form
    return View(model);
}

如您所见，我创建了一个ClaimsIdentity并向其添加了几个声明，然后使用AuthenticationManager将其传递给OWIN以执行登录.

The problem I am having is that I'm not sure how to access the claims in the rest of my application, either in Controllers or in Razor Views.个

我try 了本教程中列出的方法

http://brockallen.com/2013/10/24/a-primer-on-owin-cookie-authentication-middleware-for-the-asp-net-developer/个

例如，我在控制器代码中try 了这一点，试图访问传递到声明中的值，但是，用户.索赔等于零

var ctx = HttpContext.GetOwinContext();
ClaimsPrincipal user = ctx.Authentication.User;
IEnumerable<Claim> claims = user.Claims;

也许我错过了什么.

UPDATE个

根据Darin的回答，我添加了他的代码，但我仍然看不到访问声明的权限.请看下面的屏幕截图，其中显示了当我将鼠标悬停在身份上方时看到的内容.声明.