Question

我想从查询中生成一个列表并在视图中显示，但它向我显示了如下错误，我所犯的错误是什么？

传递到字典中的模型项是类型的＆＃39; {System.Collections.Generic.List {1}} 1 [SurveyTool.Models.AnswerQuestionViewModel]＆＃39;

Edit.cshtml：

1[SurveyTool.Models.SURV_Question_Ext_Model]',
  but this dictionary requires a model item of type
  'System.Collections.Generic.List

SURV_AnsControllers：

    @model List<SurveyTool.Models.AnswerQuestionViewModel>

@{
    ViewBag.Title = "Edit";
}

<h2>Edit</h2>

@using (Html.BeginForm())
{
    for (int i = 0; i < Model.Count;i++ )
    {
        <table>

        <tr>
            <td>
                @Html.DisplayFor(m => m[i].Question_Ext)
            </td>
        </tr>
        </table>

    }
    <input type="submit" />
}

AnswerQuestionViewModel：

[HttpGet]
        public ActionResult Edit(int Survey_ID)
        {

               var model =from r in db.SURV_Question_Ext_Model
                         join s in db.SURV_Question_Model
                         on r.Qext_Question_ID equals
                         s.Question_ID
                         where s.Question_Survey_ID == Survey_ID
                         orderby s.Question_Position ascending
                         select r;

            return View(model.ToList());
        }

Answer 1

您的视图期望模型是一个列表，而您的控制器方法只返回模型的单个实例。

您是否尝试返回列表？

[HttpGet]
public ActionResult Edit(int Survey_ID)
{
    AnswerQuestionViewModel mymodel = new AnswerQuestionViewModel();
    var myList = new List<AnswerQuestionViewModel>();
    mymodel.Survey_ID = Survey_ID;
    myList.Add(mymodel);
    return View(myList);
}

Answer 2

您正在将单个视图模型传递给Razor。变化：

@model List<urveyTool.Models.AnswerQuestionViewModel>
@Html.DisplayFor(m => m[i].Question_Ext[i].Qext_Text)

要：

@model urveyTool.Models.AnswerQuestionViewModel
@Html.DisplayFor(m => m.Question_Ext[i].Qext_Text)
@Html.HiddenFor(m => m.Question_Ext[i].Qext_Text)

隐藏的输入标记将用于将数据发布回控制器。

生成一个列表并返回Linq查看

2 个答案: