C# 如何将MVC复选框绑定到模型

我有一个输出问题列表的视图。用户将选择他们希望包含在报告中的问题，然后提交表单

我的观点是：

@using (Html.BeginForm("Step6", "Home", FormMethod.Post))
{
  @Html.HiddenFor(m => m.EventID)
  @Html.HiddenFor(m => m.CompanyID)
  foreach (var item in Model.Questions)
  {
      <div class="checkbox">
      <input type="checkbox" id="@item.QuestionID" name="QuestionIds" value="@item.Title" />
      <label for="@item.QuestionID">@item.Title</label>
      </div>
  }
  <p><input type="submit" class="btn btn-primary" value="Submit" /></p>
}

<div class="checkbox">
    <input type="checkbox" id="12" name="QuestionIds" value="Would you like an account manager to contact you?" />
    <label for="12">Would you like an account manager to contact you?</label>
</div>
<div class="checkbox">
    <input type="checkbox" id="13" name="QuestionIds" value="Comments - please be as detailed as possible." />
    <label for="13">Comments - please be as detailed as possible.</label>
</div>

控制器动作

    [HttpPost]
    public ActionResult Step6(Models.EventCompanyQuestionnaireQuestions model)
    {
        return View();
    }

模型：

public class EventCompanyQuestionnaireQuestions
{
    public int EventID { get; set; }
    public int CompanyID { get; set; }
    public List<Guid> QuestionIds { get; set; }
}

---

提交表单时，列表为空的初始化列表。呈现的表单元素名为QuestionID，它与模型匹配。我需要问号来选中复选框。

您需要使用索引表达式：

@using (Html.BeginForm("Step6", "Home", FormMethod.Post))
{
    @Html.HiddenFor(m => m.EventID)
    @Html.HiddenFor(m => m.CompanyID)
    for( Int32 i = 0; i < this.Model.Questions.Count; i++ )
    {
    <div class="checkbox">
        @Html.CheckBoxFor( m => m.Questions[i].Selected )
        @Html.LabelFor( m => m.Questions[i].Selected, this.Model.Questions[i].Title )
    </div>
    }
    <p><input type="submit" class="btn btn-primary" value="Submit" /></p>
}

请注意，理想情况下，应该同时包装和文本。我也改为：

这是我的模型：

 public class Question
{
    public int QuestionID { get; set; }
    public string Title { get; set; }
    public bool Selected { get; set; }
}

public class EventCompanyQuestionnaireQuestions
{
    public int EventID { get; set; }
    public int CompanyID { get; set; }
    public List<Question> Questions { get; set; }
}

以下是视图：

@using (Html.BeginForm("Edit", "Question", FormMethod.Post))
{
    @Html.HiddenFor(m => m.EventID)
    @Html.HiddenFor(m => m.CompanyID)
    for (int i = 0; i < this.Model.Questions.Count; i++)
    {
    <div class="checkbox">
        @Html.HiddenFor(m => m.Questions[i].QuestionID)
        @Html.CheckBoxFor(m => m.Questions[i].Selected)
        @Html.DisplayFor(m => m.Questions[i].Title)
    </div>
    }
    <p><input type="submit" class="btn btn-primary" value="Submit" /></p>
}

用于测试的控制器：

 // GET: Question
    public ActionResult Index()
    {
        EventCompanyQuestionnaireQuestions model = new EventCompanyQuestionnaireQuestions
        {
            CompanyID = 1,
            EventID = 2,
            Questions = new List<Question>
            {
                new Question {    QuestionID = 1,   Selected = false,  Title= "What is your name"  },
                new Question {    QuestionID = 2,   Selected = false,  Title= "How old are you"  },
                new Question {    QuestionID = 3,   Selected = false,  Title= "Where are you from"  },
                new Question {    QuestionID = 4,   Selected = false,  Title= "What is your profession"  },
            }
        };
        return View(model);
    }


    [HttpPost]
    public ActionResult Edit(EventCompanyQuestionnaireQuestions model)
    {
        var ids = model.Questions.Where(q => q.Selected).Select(q => q.QuestionID).ToList();

        if(ids!=null && ids.Any())
        {
            foreach (var id in ids)
                Debug.WriteLine(id);
        }

        return View();
    }

以下是我从Visual studio获得的结果：

---

谢谢。这在CheckBoxFor行上给出了一个错误-无法将类型question隐式转换为boolI向问题项添加了一个选定的属性，在CheckBoxFor行中使用了该属性。QuestionID现在在中设置为空action@andrewb我已经修改了我的答案。问题仍然存在null@andrewb改变你的viewmodel设计，你不需要一个单独的问题ID列表。关于这个问题有很多答案

@using (Html.BeginForm("Edit", "Question", FormMethod.Post))
{
    @Html.HiddenFor(m => m.EventID)
    @Html.HiddenFor(m => m.CompanyID)
    for (int i = 0; i < this.Model.Questions.Count; i++)
    {
    <div class="checkbox">
        @Html.HiddenFor(m => m.Questions[i].QuestionID)
        @Html.CheckBoxFor(m => m.Questions[i].Selected)
        @Html.DisplayFor(m => m.Questions[i].Title)
    </div>
    }
    <p><input type="submit" class="btn btn-primary" value="Submit" /></p>
}

 // GET: Question
    public ActionResult Index()
    {
        EventCompanyQuestionnaireQuestions model = new EventCompanyQuestionnaireQuestions
        {
            CompanyID = 1,
            EventID = 2,
            Questions = new List<Question>
            {
                new Question {    QuestionID = 1,   Selected = false,  Title= "What is your name"  },
                new Question {    QuestionID = 2,   Selected = false,  Title= "How old are you"  },
                new Question {    QuestionID = 3,   Selected = false,  Title= "Where are you from"  },
                new Question {    QuestionID = 4,   Selected = false,  Title= "What is your profession"  },
            }
        };
        return View(model);
    }


    [HttpPost]
    public ActionResult Edit(EventCompanyQuestionnaireQuestions model)
    {
        var ids = model.Questions.Where(q => q.Selected).Select(q => q.QuestionID).ToList();

        if(ids!=null && ids.Any())
        {
            foreach (var id in ids)
                Debug.WriteLine(id);
        }

        return View();
    }