如何在 c# mvc 中将值从 UI 绑定到具有复杂模型的控制器

Question

我是 .net 的新手。我有这个模型，这几天给我带来了真正的麻烦。

类DetailedRecordModel

public class DetailedRecordModel
    {
        public string RecordID { get; set; }
        public string EmployeeID { get; set; }
        public string CustomerID { get; set; }

        [DataType(DataType.Date)]
        public string InitDate { get; set; }

        [DataType(DataType.Date)]
        public string DeliveryDate { get; set; }
        public virtual ICollection<PurchaseDetail> detail{ get; set; }
}

类 PurchaseDetail

public class PurchaseDetail
    {
        public string ProductID { get; set; }
        public int Qty { get; set; }
        public double price { get; set; }
        public string RecordID { get; set; }

    }

控制器

        [HttpPost]
        [ValidateAntiForgeryToken]
        public ActionResult Create(DetailedRecordModel record)
        {
            if (ModelState.IsValid)
            {
            return View(record);
             
            }
                return RedirectToAction("ViewRecords");
        }

html

<div class="form-group">
            @Html.LabelFor(model => model.EmployeeID, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.DropDownListFor(model => model.EmployeeID, (IEnumerable<SelectListItem>)ViewData["sellistemp"])
                @Html.ValidationMessageFor(model => model.EmployeeID, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.CustomerID, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.DropDownListFor(model => model.CustomerID, (IEnumerable<SelectListItem>)ViewData["sellistcust"])
                @Html.ValidationMessageFor(model => model.CustomerID, "", new { @class = "text-danger" })
            </div>
        </div>
 <tr>
       <td style="display:none" id="Index0" name="detail.Index" value="0"></td>
       <td>1</td>
       <td id="ProductID" name="detail[0].ProductID" value="sp00002">sp00002</td>
       <td id="Qty" name="detail[0].Qty" value="12123">12123</td>
       <td id="price" name="detail[0].price" value="2312">2312</td>
</tr>
<tr>
       <td style="display:none" id="Index1" name="detail.Index" value="1"></td>
       <td>2</td>
       <td id="ProductID" name="detail[1].ProductID" value="sp00003">sp00003</td>
       <td id="Qty" name="detail[1].Qty" value="2323">2323</td>
       <td id="price" name="detail[1].price" value="3223">3223</td>
</tr>

对于 RecordID、EmployeeID、CustomerID、InitDate 和 DeliveryDate 将它们传递给控制器​​都很好，但是对于 <PurchaseDetail> detail，我总是得到 null。我该如何解决这个问题？

Answer 1

您必须使用View(myModel) 或RedirectToAction("ViewRecords", record) 将模型传递给视图

    [HttpPost]
    [ValidateAntiForgeryToken]
    public ActionResult Create(DetailedRecordModel record)
    {
        if (ModelState.IsValid)
        {
            return RedirectToAction("ViewRecords", record);
         
        }
        return View(record);
    }

    public IActionResult ViewRecords(DetailedRecordModel model)
    {
        return View(model);
    }

然后在视图中你可以像这里How to pass model in MVC view一样访问模型

1. 在@model DetailedRecordModel; 的顶部添加模型的定义
2. 添加模型后，您可以使用@Model（html 格式）或Model 在文件中的任何位置访问它

    @model DetailedRecordModel;
    @{
        ViewData["Title"] = "ViewRecords";
    }

    <h1>ViewRecords</h1>

    <div class="form-group">
        @Html.LabelFor(model => model.EmployeeID, htmlAttributes: new { @class = "control-label col-md-2" })
        <div class="col-md-10">
            @Html.DropDownListFor(model => model.EmployeeID, (IEnumerable<SelectListItem>)ViewData["sellistemp"])
            @Html.ValidationMessageFor(model => model.EmployeeID, "", new { @class = "text-danger" })
        </div>
    </div>

    <div class="form-group">
        @Html.LabelFor(model => model.CustomerID, htmlAttributes: new { @class = "control-label col-md-2" })
        <div class="col-md-10">
            @Html.DropDownListFor(model => model.CustomerID, (IEnumerable<SelectListItem>)ViewData["sellistcust"])
            @Html.ValidationMessageFor(model => model.CustomerID, "", new { @class = "text-danger" })
        </div>
    </div>

    @foreach (var entry in Model.detail)
    {
        <tr>
            <td style="display:none" id="Index0" name="detail.Index" value="0"></td>
            <td>1</td>
            <td id="ProductID" name="@entry.ProductID" value="sp00002">sp00002</td>
            <td id="Qty" name="@entry.Qty" value="12123">12123</td>
            <td id="price" name="@entry.price" value="2312">2312</td>
        </tr>
    }

Answer 2

在绝望的两天后，我知道为了绑定值，我通过在模型PurchaseDetail 中声明一个对象DetailedRecordModel 找到了答案，我必须将每个<input> 标记的名称更改为@ 987654324@