c# - MVC5 ViewModel 不回发到 Controller

Question

所以，我有一个 Controller / View / View 模型的问题。它类似于 this issue我认为。基本上，我有一个从我的 Controller 发送到 View 的 View 模型。在将整个困惑发送回 Controller 后操作之前，有些项目会显示，然后是一些额外的字段供用户操作。当我在帖子中取回数据时，所有 View 模型都是空的。

所以，事不宜迟，这里有一些代码要看:

View 模型:

public class ASideReceivingViewModel
{
    public PurchaseOrderLine poLine;
    public ReceivingItem receivingItem;

    public Dictionary<string, string> TankerOrRailcarOptions { get; set; }

    public ASideReceivingViewModel()
    {
        TankerOrRailcarOptions = new Dictionary<string, string>();
        TankerOrRailcarOptions.Add("R", "Railcar");
        TankerOrRailcarOptions.Add("T", "Tanker");

    }

}

Controller 操作:

public ActionResult Receive(string strOrdNo, short? shtLineNo)
{

    //if there isn't a selected po line, then shoot them back to the first page
    if (strOrdNo == null || !shtLineNo.HasValue) return RedirectToAction("Index");

    PurchaseOrderService poService = new PurchaseOrderService();
    ReceivingItemService s = new ReceivingItemService(p);

    ASideReceivingViewModel vm = new ASideReceivingViewModel();


    vm.poLine = poService.GetOpenPurchaseOrderLines().Where(po => po.Ord_no == strOrdNo &&
        po.Line_no == shtLineNo).FirstOrDefault();

    if (vm.poLine == null) return RedirectToAction("Index");

    vm.receivingItem = s.CreateNewReceivingItem(vm.poLine);

    return View(vm);

}

[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Receive(ASideReceivingViewModel mytestvm)
{
    if (ModelState.IsValid && mytestvm.receivingItem != null)
    {
        ReceivingItemService s = new ReceivingItemService(p);
        s.Update(mytestvm.receivingItem);
        return RedirectToAction("Index");

    }

    return View(mytestvm);
}

查看:

@model FSIApps.Presentation.Models.ASideReceivingViewModel
<div class="row">
    @{Html.RenderPartial("POLineDetails", Model.poLine);}
</div>

@using (Html.BeginForm("Receive", "Receiving", FormMethod.Post))
{
@Html.HiddenFor(model => model.receivingItem.Id)
<div class="row">
    <div class="col-md-8 col-md-offset-2">
        <div class="row">
            @Html.AntiForgeryToken()
            <div class="col-md-6">
                <div class="form-group">
                    <label for="receivingItem_Batch_number">Batch Number</label>
                    @Html.TextBoxFor(model => model.receivingItem.Batch_number, new { @class = "form-control" })
                    <span class="help-block">*Also the Vendor Lot Number on the BOL</span>
                </div>
            </div>

            <div class="col-md-6">
                <div class="form-group">
                    <label for="receivingItem_Qty_received">Qty Received</label>
                    @Html.TextBoxFor(model => model.receivingItem.Qty_received, new { @class = "form-control" })
                    <span class="help-block">*Qty shown on BOL</span>
                </div>
            </div>
        </div>
        <div class="row">
            <div class="col-md-6">
                <div class="form-group">
                    <label for="receivingItem_Carrier">Carrier</label>
                    @Html.TextBoxFor(model => model.receivingItem.Carrier, new { @class = "form-control" })
                </div>
            </div>
            <div class="col-md-6">
                <div class="form-group">
                    <label for="receivingItem_">Tanker or Railcar</label>
                    @Html.DropDownListFor(m => m.receivingItem.Tanker_or_railcar, new SelectList(Model.TankerOrRailcarOptions, "Key", "Value", Model.receivingItem.Tanker_or_railcar), new { @class = "form-control" })
                </div>
            </div>
        </div>
        <div class="row">
            <div class="col-md-6">
                <div class="form-group">
                    <label for="receivingItem_Railcar_number">Railcar Number</label>
                    @Html.TextBoxFor(model => model.receivingItem.Railcar_number, new { @class = "form-control" })
                </div>
            </div>
            <div class="col-md-6">
                <div class="form-group">
                    <label for="receivingItem_Manifest_number">Manifest Number</label>
                    @Html.TextBoxFor(model => model.receivingItem.Manifest_number, new { @class = "form-control" })
                </div>
            </div>
        </div>

        <div class="row">
            <div class="col-md-6">
                <div class="form-group">
                    <input type="submit" value="Save" class="btn btn-success" />
                </div>
            </div>
        </div>
    </div>
</div>
}

我不一定关心我发送到局部 View 的数据，但是当我回发常规表单时，我没有在 ViewModel 中设置任何内容。在另一篇文章中，他们讨论了命名发送回 Controller 的参数的问题，但是在我的 @Html.BeginForm() 中设置值的组合似乎没有用。

这里有人对我有什么建议吗？

编辑:

Answer 1

要使用自动模型绑定(bind)，您应该使用属性而不是 View 模型中的字段。希望这可以解决问题:

public class ASideReceivingViewModel
{
    public PurchaseOrderLine poLine { get; set; };
    public ReceivingItem receivingItem { get; set; };
    ...
}