MVC2和会话

Question

我正在使用验证码生成器。 http://xcaptcha.codeplex.com/。在示例中，它显示使用Session.Add来比较验证码生成与答案。我想让它成为我的模型的规则违规检查器的一部分，但我似乎无法找到/使​​用那里的会话的正确部分。我是否错过了从模型的GetRuleViolations中导航到会话的方法？任何其他提示赞赏

// Controller
public ActionResult Image()
{
    var builder = new XCaptcha.ImageBuilder();
    var result = builder.Create();
    Session.Add("CaptchaKey", result.Solution);
    return new FileContentResult(result.Image, result.ContentType);
}

// My model
public IEnumerable<RuleViolation> GetRuleViolations()
{
    // This isn't correct... it isn't stored in server variables
    string captchaAnswer = HttpContext.Current.Request.ServerVariables.Get("CaptchaKey");
    // No such thing..
    string res = Session["Something"].ToString();
}

// My eh solution
// Controller
[HttpPost]
public ActionResult ContactUs(EmailModel e, FormCollection collection)
{
    string captchaAnswer = Session["CaptchaKey"].ToString();
    string captchaText = collection["CaptchaText"].ToUpper().ToString();
    bool correctCaptcha = (captchaAnswer.CompareTo(captchaText) == 0) ? true : false;

    if (e.IsValid && correctCaptcha)
    {
        EmailHelper.SendMessage(e);
        return RedirectToAction("ContactSuccess");
    }
    else
    {
        if (!correctCaptcha)
            ModelState.AddModelError("Captcha", "Incorrect Captcha answer");

        ModelState.AddRuleViolations(e.GetRuleViolations());
    }

    return View(e);
}

Answer 1

HttpContext.Current.Session

Answer 2

我刚刚更新了它。现在有一个版本2，它不再使用会话来维护状态并使用基于模型的验证。