我想生成列表并绑定到viewmodel但是我在下面得到错误,我是否定义了错误的属性?
传递到字典中的模型项是类型的 'SurveyTool.Models.AnswerQuestionViewModel',但是这本字典 需要类型的模型项 'System.Collections.Generic.IEnumerable`1 [SurveyTool.Models.AnswerQuestionViewModel]'。
Edit.cshtml:
@model IEnumerable<SurveyTool.Models.AnswerQuestionViewModel>
@{
ViewBag.Title = "Edit";
}
<h2>Edit</h2>
<table>
@foreach (var item in Model) {
<tr>
<td>
@Html.DisplayFor(modelItem => item.Question)
</td>
<td>
@Html.EditorFor(modelItem => item.Answer)
</td>
</tr>
}
</table>
SURV_AnswerController:
using System;
using System.Collections.Generic;
using System.Data;
using System.Data.Entity;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using SurveyTool.Models;
namespace SurveyTool.Controllers
{
public class SURV_AnswerController : Controller
{
private SurveyToolDB db = new SurveyToolDB();
//
// GET: /SURV_Answer/
public ActionResult Edit(int Survey_ID)
{
AnswerQuestionViewModel viewmodel = new AnswerQuestionViewModel();
var query = 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;
foreach(var item in query)
{
viewmodel.Question = item.Qext_Text;
}
return View(viewmodel);
}
}
}
AnswerQuestionViewModel:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Web;
using System.Web.Mvc;
namespace SurveyTool.Models
{
public class AnswerQuestionViewModel
{
public string Answer { get; set; }
public string Question { get; set; }
}
}
答案 0 :(得分:1)
您只返回一个@Entity
@Table(name = "AW_MEDIA_DETAILS")
public class MediaDetails implements WFPayload , Serializable{
/**
*
*/
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
@Column(name = "REQUEST_ID", unique = true, nullable = false)
Long requestId;
....
项,而不是一个集合。在AnswerQuestionViewModel
方法中,更改
public ActionResult Edit(int Survey_ID)
到
AnswerQuestionViewModel viewmodel = new AnswerQuestionViewModel();
然后在List<AnswerQuestionViewModel> viewmodel = new List<AnswerQuestionViewModel>();
循环
foreach
修改强>
请注意,您的观点也存在问题。您使用foreach(var item in query)
{
viewmodel.Add(new AnswerQuestionViewModel() { Question = item.Qext_Text });
}
return View(viewmodel);
循环生成重复的foreach
属性,因此集合不会在回发时绑定。由于重复的name
属性,它还会生成无效的html。您需要为id
类型使用自定义for
的{{1}}循环。使用EditorTemplate
循环,它必须是
AnswerQuestionViewModel
但是,这只会回发模型的for
属性。您没有任何标识问题ID的属性,因此您可能需要ID的附加属性,并在视图中包含隐藏的输入