表单POST正在向控制器发送空值。 [英] The form POST is sending null value to controller.

问题描述

我正在尝试通过表单更新数据库中的多行。 Th值在foreach循环中。我正在尝试更新表单中回答字段的几行。请找到以下代码：

I am trying to update several rows in my database through a form. Th values are in foreach loop. I am trying to update several rows for the field 'Answer' in the form. Please find the code below:

View:
@model IEnumerable<VOC.Models.QuestionnaireFeedback>

@{
    ViewBag.Title = "Index";
}

@using (Html.BeginForm("updateFeedback", "Questionnaire", FormMethod.Post))
{
      @foreach(var item in Model){
          @Html.DisplayFor(modelItem => item.ProjectID)
          @Html.DisplayFor(modelItem => item.FeedbackNo)
          @Html.EditorFor(modelItem => item.Answer)
      }
<input type="submit" value="Save" />
}

Controller:
<pre>[HttpPost]
        public ActionResult updateFeedback(List<QuestionnaireFeedback> fromQuestionnaire)
        {
            if (ModelState.IsValid) {
                FeedbackBusinessLayer feedbcakBusLayr = new FeedbackBusinessLayer();
                feedbcakBusLayr.updateFeedback(fromQuestionnaire);
                return RedirectToAction("Index");
            }
            
            return View(db.QuestionnaireFeedbacks.ToList());
        }

我对MVC的概念比较陌生。但是，我调试了代码，在Controller fromQuestionnaire 中为null。

我已经被困了一段时间了。任何帮助将不胜感激。

I am relatively new to the concept of MVC. But,I debugged the code, in the Controller fromQuestionnaire is null.
I have been stuck for a while now. Any help will be appreciated.

推荐答案

您需要使用基于数组的方法而不是foreach。



http://haacked.com/archive/ 2008/10/23 / model-binding-to-a-list.aspx / [ ^ ]

Rather than foreach in your view you need to use an array-based approach.

http://haacked.com/archive/2008/10/23/model-binding-to-a-list.aspx/[^]

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