重新发送未使用的模型字段以将表单提交到过帐方法？

Question

我要在“提交”表单上从“获取方法”中发送未使用的“模型”字段，如何将IEnumerable类型的字段发送回“帖子”？

我尝试使用

@Html.HiddenFor(model => model.MultiUserList)
@Html.HiddenFor(model => model.VerticalList)

但是我遇到了错误：

System.MissingMethodException: No parameterless constructor defined for this object.

这是MVC应用程序的所有部分

模型

 public  MultiSelectList MultiUserList { get; set; }
 public IEnumerable<SelectListItem> VerticalList { get; set; }

我正在使用单独的类向我发送ViewModel

 public ProjectViewModel GetProject(int id)
 {
   using (PMEntities2 db = new PMEntities2())
   {           
     ProjectViewModel model = new ProjectViewModel();   
     //more code to populate other fields
       model.VerticalList = GetVerticalList();
       model.MultiUserList = GetMultiUserList();
       return model; 
     }
   }

GetMultiUserList（）

public MultiSelectList GetMultiUserList()
{
 PMEntities2 db = new PMEntities2();
 List<tbUser> tbUserList = db.tbUsers.ToList();
 IEnumerable<SelectListItem> UserList = tbUserList.Select(x => new SelectListItem()
 {
   Value = x.UserId.ToString(),
   Text = x.UserName.ToString()
  }).ToList();

MultiSelectList teamList = new MultiSelectList(UserList, "Value", "Text");
return teamList;
}

GetVerticalList（）

public IEnumerable<SelectListItem> GetVerticalList()
{
 PMEntities2 db = new PMEntities2();
 List<tbVertical> tbVerticalList = db.tbVerticals.ToList();
 IEnumerable<SelectListItem> VerticalList = tbVerticalList.Select(z => new SelectListItem()
  {
   Value = z.VerticalId.ToString(),
   Text = z.VerticalName.ToString()
  }).ToList();

 return VerticalList;
}

控制器

[AuthorizeRoles("A")]
public ActionResult AddProject(int id = 0)
{
 ProjectManager PM = new ProjectManager();
 ProjectViewModel PVM = new ProjectViewModel();

 PVM = PM.GetProject(id);
 return View(PVM);
        }

[AuthorizeRoles("A")]
[HttpPost]
public ActionResult AddProject(ProjectViewModel PVM)
 {
   if (ModelState.IsValid)
     {


         ProjectManager PM = new ProjectManager();
         PVM.ProjectLeaderId = Convert.ToInt16(PVM.ProjectLeader);
         int projectId = PM.AddProject(PVM);
      }
}

AddProject（）

 public int AddProject(ProjectViewModel PVM)
        {
                PMEntities2 db = new PMEntities2();
                tbProject project = new tbProject();

                project.ProjectName = PVM.ProjectName.ToUpper();
                project.ProjectVerticalId = PVM.VerticalId;
                project.ProjectDescription = PVM.ProjectDescription;

                if(PVM.StartDate == null)
                {
                    project.ProjectStartDate = DateTime.Now;
                }

                project.ProjectStartDate = PVM.StartDate;
                project.ProjectEndDate = PVM.EndDate;
                project.ProjectLeader = PVM.ProjectLeaderId;
                project.ProjectStatus = "ASSIGNED";

                if (isProjectNameAlreadyExists(PVM) == true)
                {
                    return 0;
                }
                db.tbProjects.Add(project);
                db.SaveChanges();

                return (project.ProjectId);



        }

查看

@model PManager.Models.VIewModel.ProjectViewModel

@{
    ViewBag.Title = "AddProject";
    Layout = "~/Views/Shared/_Layout.cshtml";
}

<h2>Add Project</h2>


@using (Html.BeginForm()) 
{
    @Html.AntiForgeryToken()

    <div class="form-horizontal">

        <hr />

        @Html.ValidationSummary(true, "", new { @class = "text-danger" })
        <div class="form-group">
            @Html.LabelFor(model => model.ProjectName, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.ProjectName, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.ProjectName,"", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.ProjectDescription, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.ProjectDescription, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.ProjectDescription,"", new { @class = "text-danger" })
            </div>
        </div>


        <div class="form-group">
            @Html.LabelFor(model => model.ProjectLeader, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.DropDownListFor(x => x.ProjectLeader, Model.TeamMembers , "--Leader--", new { id = "LeaderDropDown" })
                @Html.ValidationMessageFor(model => model.ProjectLeader, "", new { @class = "text-danger" })
            </div>
        </div>


        <div class="form-group">
            @Html.LabelFor(model => model.VerticalId, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.DropDownListFor(x => x.VerticalId, Model.VerticalList, "--Vertical--", new { id = "VerticalDropDown" })
                @Html.ValidationMessageFor(model => model.VerticalId, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.ProjectStatus, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.DropDownListFor(x => x.ProjectStatus , Model.StatusList, "--Status--", new { id = "StatusDropDown" })
                @Html.ValidationMessageFor(model => model.ProjectStatus, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.StartDate, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.StartDate, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.StartDate, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.EndDate, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.EndDate, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.EndDate, "", new { @class = "text-danger" })
            </div>
        </div>
        <div class="form-group">
            @Html.LabelFor(model => model.SelectedMembers, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.ListBoxFor(x => x.SelectedMembers ,Model.MultiUserList, new { id = "MemberDropDown" })

                 @Html.ValidationMessageFor(model => model.SelectedMembers, "", new { @class = "text-danger" })
            </div>
        </div>


        @Html.HiddenFor(model => model.MultiUserList)
        @Html.HiddenFor(model => model.StatusList)
        @Html.HiddenFor(model => model.VerticalList)
        @Html.HiddenFor(model => model.TeamMembers)






        <div class="form-group">
            <div class="col-md-offset-2 col-md-10">
                <input type="submit" value="Create" class="btn btn-default" />
            </div>
        </div>
    </div>
}

<div>
    @Html.ActionLink("Back to List", "Index")
</div>

<script src="~/Scripts/jquery-1.10.2.min.js"></script>
<script src="~/Scripts/jquery.validate.min.js"></script>
<script src="~/Scripts/jquery.validate.unobtrusive.min.js"></script>


<script>
    $(function () {



        $("#MemberDropDown").chosen({
            width: "50%",
            placeholder_text_single: "Select Members",
            no_results_text: "Oops, nothing found!"
        });

        $("#LeaderDropDown").chosen({
            width: "50%",
            placeholder_text_single: "Select Project Leader",
            no_results_text: "Oops, nothing found!"
        });

    });
    $.validator.setDefaults({
        ignore: []
    });

</script>