从 .NET Core MVC 中的另一个模型向 table 中插入数据

Question

我正在尝试构建一个测验应用程序，我想在提交测验后插入用户的答案。这是我的问题模型：

public class Question
{
    [Key]
    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    [Display(Name = "Id Question")]
    public int id_question { get; set; }

    [Column(TypeName = "varchar(100)")]
    [Display(Name = "Question")]
    public string question { get; set; }

    public string option1 { get; set; }
    public string option2 { get; set; }
    public string option3 { get; set; }
    public string option4 { get; set; }

    public string answer { get; set; }

    public virtual List<Result> Results { get; set; }
}

这是我要存储用户答案的结果模型：

public class Result
{
    [Key]
    [Display(Name ="Id Result")]
    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]

    public int id_result { get; set; }

    [ForeignKey("User")]
    [Required]
    public string Id_User { get; set; }

    [Display(Name = "user")]
    [NotMapped]
    public string User_Name { get; set; }

    [ForeignKey("Question")]
    [Required]
    public int id_question { get; set; }

    [Display(Name = "Question")]
    [NotMapped]
    public string q { get; set; }
    public string UserAnswer { get; set; }
    public virtual ApplicationUser User { get; set; }
    public virtual Question Question { get; set; }
}

将试题存储在数据库中后，我想像这样显示它们并在提交后存储答案：

@model IEnumerable<Exam.Areas.Identity.Data.Question>
@{
    ViewData["Title"] = "Exam";
}

<div>
    <h4>Question</h4>
    <hr />

    @foreach (var item in Model)
    {
        <div class="row pl-5">
            <div class="col-md-4">
                <div>@Html.DisplayFor(modelItem => item.question)</div>
                <div class="form-check">
                    <input class="form-check-input" type="radio" value="@item.option1" name="@item.id_question" id="">
                    <label class="form-check-label" for="">
                        @Html.DisplayFor(modelItem => item.option1)
                    </label>
                </div>
                <div class="form-check">
                    <input class="form-check-input" type="radio" value="@item.option2" name="@item.id_question" id="">
                    <label class="form-check-label" for="">
                        @Html.DisplayFor(modelItem => item.option2)
                    </label>
                </div>
                <div class="form-check">
                    <input class="form-check-input" type="radio" value="@item.option3" name="@item.id_question" id="">
                    <label class="form-check-label" for="">
                        @Html.DisplayFor(modelItem => item.option3)
                    </label>
                </div>
                <div class="form-check">
                    <input class="form-check-input" type="radio" value="@item.option4" name="@item.id_question" id="">
                    <label class="form-check-label" for="">
                        @Html.DisplayFor(modelItem => item.option4)
                    </label>
                </div>
            </div>
        </div>

    }

我试过很多东西都是徒劳的。谁能帮我想办法解决这个问题？

Answer 1

根据您回复的 Rahul Sharma 的评论判断，您的问题可能是如何将答案存储在结果 table 中。如果我们要回答多个问题并在一个页面中提交，我们可以将问题和相应的答案作为一个List集合传回给controller，存储到数据库中以供调用。如果允许调用多个模型加载数据，可以参考下面的示例代码。

型号：

Questions.cs:

public class Question
{
        [Key]
        public int id_question { get; set; }

        [Column(TypeName = "varchar(100)")]
        [Display(Name = "Question")]
        public string question { get; set; }

        public string option1 { get; set; }
        public string option2 { get; set; }
        public string option3 { get; set; }
        public string option4 { get; set; }

        public string answer { get; set; }

}

Result.cs:

public class Result
{
        [Key]
        [Display(Name = "Id Result")]
        public int id_result { get; set; }
        [Required]
        public int Id_User { get; set; }
        [Required]
        public string User_Name { get; set; }

        [ForeignKey("Question")]
        [Required]
        public int id_question { get; set; }

        public string q { get; set; }
        public string UserAnswer { get; set; }
}

ApplicationUser.cs:

public class ApplicationUser
{
        [Key]
        [Required]
        public int Id { get; set; }
        [Required]
        public int Id_User { get; set; }
        [Required]
        public string User_Name { get; set; }   
}

控制器： QuestionAndResultController.cs:

public class QuestionAndResultController : Controller
{

        private readonly MyDbContext _myDbContext;

        public QuestionAndResultController(MyDbContext myDbContext)
        {
            _myDbContext = myDbContext;

        }

       
        public async Task<IActionResult> Index()
        {
            var question = from m in _myDbContext.Question
                           select m;
            ViewBag.UserRecord = await (from m in _myDbContext.ApplicationUser select m).ToListAsync();
            ViewBag.ResultRecord = await (from m in _myDbContext.Result select m).ToListAsync();
            
            return View(await question.ToListAsync());
        }

        [HttpGet]
        public async Task<IActionResult> ResultAnswer()
        {
            var  question = await (from m in _myDbContext.Question select m).ToListAsync();
            ViewBag.Question = question;
            return View();
        }

        [HttpPost]
        [ValidateAntiForgeryToken]
        public async Task<IActionResult> ResultAnswer(int Id_User,List<int> id_question, List<string> UserAnswer, List<string> q,string User_Name)
        {
            if (ModelState.IsValid)
            {
                var UserRecord = await (from m in _myDbContext.ApplicationUser select m).ToListAsync();
                bool Exist = false;
                foreach (var item in UserRecord)
                {
                    if (item.Id_User == Id_User && item.User_Name == User_Name)
                        Exist = true;
                }
                if (!Exist)
                {
                    ApplicationUser user = new ApplicationUser();
                    user.Id_User = Id_User;
                    user.User_Name = User_Name;
                    _myDbContext.ApplicationUser.Add(user);
                    await _myDbContext.SaveChangesAsync();
                    for (int i = 0; i < UserAnswer.Count; i++)
                    {
                        Result result = new Result();
                        result.Id_User = Id_User;
                        result.id_question = id_question[i];
                        result.UserAnswer = UserAnswer[i];
                        result.User_Name = User_Name;
                        result.q = q[i];
                        _myDbContext.Result.Add(result);
                        await _myDbContext.SaveChangesAsync();
                    }
                }
                else
                { 
                    var ResultRecord = await (from m in _myDbContext.Result select m).ToListAsync();
                    foreach (var item in ResultRecord)
                    {
                        if (item.Id_User == Id_User && item.User_Name == User_Name)
                        {
                            for (int i = 0; i < UserAnswer.Count; i++) {
                                if (item.id_question == id_question[i])
                                {
                                    item.UserAnswer = UserAnswer[i];
                                    _myDbContext.Result.Update(item);
                                    await _myDbContext.SaveChangesAsync();
                                }
                            }
                        }
                    }
                }
                
                return RedirectToAction(nameof(Index));
            }
            return View();
        }
}

查看： Index.cshtml:

@model IEnumerable<TableTest.Models.Question>

@{
    ViewData["Title"] = "Index";
}

<h1>Question</h1>

<table class="table">
    <thead>
        <tr>
            <th>
                @Html.DisplayNameFor(model => model.question)
            </th>
            <th>
                @Html.DisplayNameFor(model => model.option1)
            </th>
            <th>
                @Html.DisplayNameFor(model => model.option2)
            </th>
            <th>
                @Html.DisplayNameFor(model => model.option3)
            </th>
            <th>
                @Html.DisplayNameFor(model => model.option4)
            </th>
            <th>
               @Html.DisplayNameFor(model => model.answer)
            </th>
        </tr>
    </thead>
    <tbody>
        @foreach (var item in Model) {
            <tr>
                <td>
                    @Html.DisplayFor(modelItem => item.question)
                </td>
                <td>
                    @Html.DisplayFor(modelItem => item.option1)
                </td>
                <td>
                    @Html.DisplayFor(modelItem => item.option2)
                </td>
                <td>
                    @Html.DisplayFor(modelItem => item.option3)
                </td>
                <td>
                    @Html.DisplayFor(modelItem => item.option4)
                </td>
                <td>
                    @Html.DisplayFor(modelItem => item.answer)
                </td>
            </tr>
        }
    </tbody>
</table>
<a class="btn btn-primary" asp-action="ResultAnswer">answer</a>

<h1>Result</h1>
<table class="table">
    <thead>
        <tr>
            <th>id_user</th>
            <th>user_name</th>
            @for (var i = 0; i < @Model.Count(); i++)
            {
                <th>qurstion@(i+1)</th>
                <th>UserAnswer</th>
            }
        </tr>
    </thead>
    <tbody>
            @foreach (var itemUser in @ViewBag.UserRecord)
            {
                <tr>
                    <td>@itemUser.Id_User</td>
                    <td>@itemUser.User_Name</td>
                    @foreach (var itemResult in @ViewBag.ResultRecord)
                    {
                        @if (@itemResult.Id_User == @itemUser.Id_User && @itemResult.User_Name == @itemUser.User_Name)
                        {
                            <td>@itemResult.q</td>
                            <td>@itemResult.UserAnswer</td>
                        }
                    }
                </tr>
            }
   </tbody>
    
</table>

ResultAnswer.cshtml:
@model TableTest.Models.Result

@{
    ViewData["Title"] = "Login";
}

<div class="row">
    <div class="col-md-4">
        <form asp-action="ResultAnswer">
            <div asp-validation-summary="ModelOnly" class="text-danger"></div>
            <div class="form-group">
                <label asp-for="Id_User" class="control-label"></label>
                <input asp-for="Id_User" class="form-control" />
                <span asp-validation-for="Id_User" class="text-danger"></span>
            </div>

            <div class="form-group">
                <label asp-for="User_Name" class="control-label"></label>
                <input asp-for="User_Name" class="form-control" />
                <span asp-validation-for="User_Name" class="text-danger"></span>
            </div>
            
            <div>Below is the question</div>
            @foreach (var item in @ViewBag.Question)
            {
                <div>@item.question</div>
                <div>
                    <label class="PillList-item">
                        <input id="Check" type="CheckBox" name="@item.option1" value="@item.id_question"/>
                        <span class="PillList-label" >
                            @item.option1
                            <span class="Icon Icon--checkLight Icon--smallest"><i class="fa fa-check"></i></span>
                        </span>
                    </label>
                </div>
                <div>
                    <label class="PillList-item">
                        <input id="Check" type="CheckBox" name="@item.option2" value="@item.id_question"/>
                        <span class="PillList-label" >
                            @item.option2
                            <span class="Icon Icon--checkLight Icon--smallest"><i class="fa fa-check"></i></span>
                        </span>
                    </label>
                </div>
                <div>
                    <label class="PillList-item">
                        <input id="Check" type="CheckBox" name="@item.option3" value="@item.id_question"/>
                        <span class="PillList-label" >
                            @item.option3
                            <span class="Icon Icon--checkLight Icon--smallest"><i class="fa fa-check"></i></span>
                        </span>
                    </label>
                </div>
                <div>
                    <label class="PillList-item">
                        <input id="Check" type="CheckBox" name="@item.option4" value="@item.id_question"/>
                        <span class="PillList-label" >
                            @item.option4
                            <span class="Icon Icon--checkLight Icon--smallest"><i class="fa fa-check"></i></span>
                        </span>
                    </label>
                </div>
                <input type="hidden" asp-for="UserAnswer" id="@item.id_question" />
                <input type="hidden" asp-for="id_question" value = "@item.id_question"/>
                <input type="hidden" asp-for="q" value = "@item.question"/>
            }
            <div class="form-group">
                <input type="submit" value="Submit" class="btn btn-primary" />
            </div>
        </form>
    </div>
</div>

<div>
    <a asp-action="Index">Back to List</a>
</div>

<script src="https://code.jquery.com/jquery-1.12.4.js" type="text/javascript"></script>
<script>
    $('input[type=checkbox]').change(function(){
          if($(this).is(":checked")){
              var value = this.attributes.name.value;
              var id = this.attributes.value.value;
              $("#"+id).attr("value",value);  
          }
          
    })
</script>

测试结果：

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从 .NET Core MVC 中的另一个模型向 table 中插入数据

Insert data in a table from another model In .NET Core MVC

c#

asp.net-core-mvc

.net-core