C# Post操作中的ViewModel属性为Null

这个问题现在已经解决了。下面是Ish的建议，再加上在视图中添加对@HiddenFor的调用，解决了这个问题

 @for (int i = 0; i < relatedDefects.Count(); i++ )
{
    <tr>
        <td>
            @Html.EditorFor(x => relatedDefects[i].IsSameDefect)
        </td>
    </tr>
}                       

我有一个ASP.NETMVC5Web应用程序，用户可以在其中将缺陷标记为已解决。我想显示一个潜在相关缺陷的列表，用户可以勾选复选框，表示是的，这是相同的缺陷，并且还应该标记为已解决

 @for (int i = 0; i < relatedDefects.Count(); i++ )
{
    <tr>
        <td>
            @Html.EditorFor(x => relatedDefects[i].IsSameDefect)
        </td>
    </tr>
}                       

因此，我有一个视图模型，它的一个属性是一个集合，其中的每个成员都包含一个缺陷对象属性和布尔值

IsSameDefect

属性。这一切在GET操作方法和视图中都可以正常工作。我可以显示相关缺陷并勾选框

 @for (int i = 0; i < relatedDefects.Count(); i++ )
{
    <tr>
        <td>
            @Html.EditorFor(x => relatedDefects[i].IsSameDefect)
        </td>
    </tr>
}                       

当我想要更新数据时，问题出现在POST操作中。此时，属性（潜在相关缺陷的集合）为空。我很难弄清楚如何将这些数据传回控制器

 @for (int i = 0; i < relatedDefects.Count(); i++ )
{
    <tr>
        <td>
            @Html.EditorFor(x => relatedDefects[i].IsSameDefect)
        </td>
    </tr>
}                       

按要求编码

// GET: /DefectResolution/Create
public ActionResult Create(int ciid)
{
    int companyId = User.CompanyID();
    DefectResolutionCreateViewModel drcvm = new DefectResolutionCreateViewModel(ciid, companyId);
    return View(drcvm);
}

// POST: /DefectResolution/Create
[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Create(DefectResolutionCreateViewModel drcvm)
{
    DefectResolutions currentResolution = drcvm.DefectResolution;
    currentResolution.CreatedOn = System.DateTime.Now;
    currentResolution.UserID = User.UserID();

    if (ModelState.IsValid)
    {
        unitOfWork.DefectResolutionRepository.Insert(currentResolution);

        if (currentResolution.ResolutionStatusID == 2)
        {
            //code breaks here as drcvm.RelatedUnresolvedDefects is null
            foreach (var relatedDefect in drcvm.RelatedUnresolvedDefects)
            {
                if (relatedDefect.IsSameDefect)
                {
                    DefectResolutions relatedResolution = new DefectResolutions();
                    relatedResolution.ChecklistID = relatedDefect.RelatedChecklist.ChecklistID;
                    relatedResolution.CreatedOn = System.DateTime.Now;
                    relatedResolution.ResolutionNote = currentResolution.ResolutionNote;
                    relatedResolution.ResolutionStatusID = currentResolution.ResolutionStatusID;
                    relatedResolution.UserID = User.UserID();
                }
            }
        }

        unitOfWork.Save();
        return RedirectToAction("Index", new { ciid = currentResolution.ChecklistID });
    }
    return View(drcvm);
}

 @for (int i = 0; i < relatedDefects.Count(); i++ )
{
    <tr>
        <td>
            @Html.EditorFor(x => relatedDefects[i].IsSameDefect)
        </td>
    </tr>
}                       

在视图中

@model Blah.ViewModels.DefectResolution.DefectResolutionCreateViewModel
@{
    ViewBag.Title = "Create Defect Resolution";
    var relatedDefects = Model.RelatedUnresolvedDefects;
}

 @for (int i = 0; i < relatedDefects.Count(); i++ )
{
    <tr>
        <td>
            @Html.EditorFor(x => relatedDefects[i].IsSameDefect)
        </td>
    </tr>
}                       

。。。后来在视图中

 @for (int i = 0; i < relatedDefects.Count(); i++ )
{
    <tr>
        <td>
            @Html.EditorFor(x => relatedDefects[i].IsSameDefect)
        </td>
    </tr>
}                       

---

我建议您在视图（.cshtml）中呈现缺陷时，使用

for

循环，而不是

foreach

 @for (int i = 0; i < relatedDefects.Count(); i++ )
{
    <tr>
        <td>
            @Html.EditorFor(x => relatedDefects[i].IsSameDefect)
        </td>
    </tr>
}                       

根据您的代码编辑答案。
视图中的以下语句创建问题

 @for (int i = 0; i < relatedDefects.Count(); i++ )
{
    <tr>
        <td>
            @Html.EditorFor(x => relatedDefects[i].IsSameDefect)
        </td>
    </tr>
}                       

 var relatedDefects = Model.RelatedUnresolvedDefects;

您应该直接迭代循环中的

Model.relatedUnsolvedDefects

属性

 @for (int i = 0; i < relatedDefects.Count(); i++ )
{
    <tr>
        <td>
            @Html.EditorFor(x => relatedDefects[i].IsSameDefect)
        </td>
    </tr>
}                       

             @for (int i = 0; i < Model.RelatedUnresolvedDefects.Count(); i++ )
                        {
                            <tr>
                                <td>
                                    @Html.EditorFor(x => Model.RelatedUnresolvedDefects[i].IsSameDefect)
                                </td>
                            </tr>
                        }

@for（int i=0；iModel.relatedUnsolvedDefects[i].IsSameDefect）
}

请发布一些代码。只有这样，我们才能帮助您解决问题。我不得不在视图中添加一系列@Html.HiddenFor调用，但与上面的Ish建议相结合解决了问题，谢谢！