获取多组单选按钮asp.net mvc 5的选定值

如果你把你的 foreach for 循环时,可以使用相同的索引关联值 i 对于您的输入名称:

@for (int i = 0; i < Model.Questions.Count(); i++)
{
    @Html.HiddenFor(model => model.Questions[i].QuestionId)
    <div class="row m-0  bg-silver-light border">
        <div class="col-12 bg-light pt-2 pb-2">
            <h6>
                @Model.Questions[i].QuestionTitle
            </h6>
            <p class="text-secondary small m-0">
                @Model.Questions[i].QuestionBody
            </p>
        </div>


        <div class="col-12 pt-2 pb-2">
            <div class="form-check-inline">
                <label class="form-check-label" for="radio2">
                    @Html.RadioButtonFor(model => model.Questions[i].Answer, 20, htmlAttributes: new { @class = "form-check-input", @id = "radio2"})
                    20
                </label>
            </div>
            <div class="form-check-inline">
                <label class="form-check-label" for="radio3">
                    @Html.RadioButtonFor(model => model.Questions[i].Answer, 40, htmlAttributes: new { @class = "form-check-input", @id = "radio3" })
                    40
                </label>
            </div>
            <div class="form-check-inline">
                <label class="form-check-label" for="radio4">
                    @Html.RadioButtonFor(model => model.Questions[i].Answer, 60, htmlAttributes: new { @class = "form-check-input", @id = "radio4" })
                    60
                </label>
            </div>
            <div class="form-check-inline">
                <label class="form-check-label" for="radio5">
                    @Html.RadioButtonFor(model => model.Questions[i].Answer, 80, htmlAttributes: new { @class = "form-check-input", @id = "radio5" })
                    80
                </label>
            </div>
            <div class="form-check-inline">
                <label class="form-check-label" for="radio6">
                    @Html.RadioButtonFor(model => model.Questions[i].Answer, 100, htmlAttributes: new { @class = "form-check-input", @id = "radio6" })
                    100
                </label>
            </div>
        </div>
    </div>
} 

Questions ,例如:

public class QuestionReviewViewModel
{
    public List<QuestionModel> Questions { get; set; } = new List<QuestionModel>();
}

您可以将QuestionId和答案值绑定到QuestionModel:

public class QuestionModel
{
    public int QuestionId { get; set; }
    public int Answer { get; set; }
}

通过简单地绑定到 HttpPost 行动:

[HttpPost]
    public ActionResult PostAction(QuestionReviewViewModel vm)
    {
        if (ModelState.IsValid)
        {
            for (int i = 0; i < vm.Questions.Count; i++)
            {
                int id = vm.Questions[i].QuestionId;
                int answer = vm.Questions[i].Answer;
            }

            return Content("Something good");
        }
        else
        {
            return Content("Something rotten");
        }
    }

Post back example

在这种情况下,我会使用SelectList-> https://docs.microsoft.com/en-us/dotnet/api/system.web.mvc.selectlist?view=aspnet-mvc-5.2

您可以将SelectList属性添加到QuestionModel中(有关参数,请参阅上面的文档),这允许您设置所选值( Answer 在这种情况下):

// List of possible answers to this question
    // populated from data source
    public List<int> AnswerList = new List<int> { 20, 40, 60, 80, 100 };

    // An MVC SelectList Class
    public SelectList PossibleAnswers => new SelectList(AnswerList, Answer);

然后,在视图中,您可以循环浏览可能的答案,如果选择了项目,则有条件地应用checked属性:

<div class="col-12 pt-2 pb-2">
            @foreach (var item in Model.Questions[i].PossibleAnswers)
                {
                    var htmlAttr = new Dictionary<string, object>{{ "@class", "form-check-input" }};

                if (item.Selected)
                {
                    htmlAttr.Add("@checked", true);
                }

                <div class="form-check-inline">
                    <label class="form-check-label" for="radio2">
                        @Html.RadioButtonFor(model => model.Questions[i].Answer, item.Text, htmlAttributes: htmlAttr)
                        @item.Text
                    </label>
                </div>
            }
        </div>