Question

我在传递变量得分方面遇到了一些麻烦，这是我的Evaluation类中的一个变量，它在我的测验控制器中的[httpPost] ifstatements（评估模型）方法中初始化为属于a的视图不同类别的不同控制器。当分数大于零时，即我至少回答一个问题时，我会进入结果视图，并向我显示分数。但我在另一个名为Index的视图中打印该分数时遇到问题，该视图是LEADERBOARD类LEADERBOARD控制器中索引方法的一部分

测验控制器

public ActionResult ifStatement()
{
    var evalVM = new Evaluation();

    //the below is hardcoded for DEMO. you may get the data from some  
    //other place and set the questions and answers

    var q1 = new Question { ID = 1, QuestionText = "1. Which of the following shows the correct syntax for an if statement?" };
    q1.Answers.Add(new Answer { ID = 12, AnswerText = "a. if expression" });
    q1.Answers.Add(new Answer { ID = 13, AnswerText = "b. if { expression }" });
    q1.Answers.Add(new Answer { ID = 14, AnswerText = "c. if ( expression ){}" });
    q1.Answers.Add(new Answer { ID = 15, AnswerText = "d. expression if" });
    evalVM.Questions.Add(q1);

    return View(evalVM);
}

[HttpPost]
public ActionResult ifStatement(Evaluation model)
{
    int score = 0;

    if (ModelState.IsValid)
    {
        using (UsersContext db = new UsersContext())
        {
            foreach (var q in model.Questions)
            {
                var qId = q.ID;

                List<string> listSelectedAnswer = new List<string>();

                listSelectedAnswer.Add("14");
                listSelectedAnswer.Add("19");
                listSelectedAnswer.Add("22");
                listSelectedAnswer.Add("25");
                listSelectedAnswer.Add("28");
                listSelectedAnswer.Add("33");

                foreach (string answer in listSelectedAnswer)
                {
                    foreach (var answer2 in model.Questions)
                    {
                        if (answer == answer2.SelectedAnswer)
                        {
                            score = score + 3;
                        }
                    }
                }

                model.Score = score;

                ViewBag.score = model.Score;

                if (score > 0)
                {
                    return View("results");
                }
                else
                {
                    //score = 0;
                    //return Content("Please check all answers have been submitted!");
                    return Content("Error, please ensure all questions have been answered. You may use the back button to continue the Quiz."); //PRG Pattern
                }
            }
        }
    }

    model.setScore(score);
    return View("ThankYou");
}

排行榜控制器

public class LeaderboardController : Controller
{
    UsersContext db = new UsersContext();
    //
    // GET: /Leaderboard/

    TutorialEntities t = new TutorialEntities();
    Evaluation e = new Evaluation();

    public ActionResult Index()
    {
        // Evaluation ev = new Evaluation();
        // var tutorial = t.Evaluations.ToList();
        //ViewBag.Scores = t.Evaluations.Select(a => a.Score).ToList();
        //ViewBag.Scores = e.getScore();
        //ViewBag.Score = e.getScore();

        ViewBag.Users = db.UserProfiles.ToList();
        ViewBag.Scores = t.Evaluations.ToList();
        return View();

    }
}

索引视图

<h2>Leaderboard</h2>

@foreach (var item2 in ViewBag.Users)
{
    <p>
        Score: @ViewBag.Score
    </p>
}

@foreach (var item in ViewBag.Users)
{
    <p>
        UserID: @item.UserId
        <br />
        UserName: @item.UserName
        <br />
    </p>
}

当我查看此视图时，页面上显示的所有内容都是在我的网站上注册的人的姓名和他们的ID，但得分是空白的！我似乎无法理解我已经尝试了很多方法，但它似乎无法看到在if语句方法中初始化的分数

Answer 1

您的控制器设置了viewbag.scores，但您的视图是否正在尝试访问viewbag.score？

将变量从一个类传递到另一个类的视图

1 个答案: