Question

我正在编写我的第一个MVC3应用程序，它是一个简单的订单跟踪应用程序。我想同时编辑订单和细节。当我编辑订单时，Edit的ActionResult返回订单和关联的行（我也使用EF）。

public ActionResult Edit(int id)
    {            
        // Get the order with the order lines
        var orderWithLines = from o in db.Orders.Include("OrderLines")
                                where o.ID == id
                                select o;

        // Not sure if this is the best way to do this.
        // Need to find a way to cast to "Order" type
        List<Order> orderList = orderWithLines.ToList();
        Order order = orderList[0];

        // Use ViewData rather than passing in the object in the View() method.
        ViewData.Model = order;
        return View();            
    }

订单和行显示没有问题，但是当我保存页面时，我没有将任何行传递回控制器。只有订单。这是查看代码。

    @model OrderTracker.Models.Order

@{
    ViewBag.Title = "Edit";
}

<h2>Edit</h2>

@using (Html.BeginForm())
{
    <fieldset>
        <legend>Order</legend>   

        @Html.HiddenFor(model => model.ID)
        @Html.HiddenFor(model => model.UserId)

        <div>
            @Html.LabelFor(model => model.OrderDate)
        </div>
        <div>
            @Html.EditorFor(model => model.OrderDate)
        </div>
        <div>
            @Html.LabelFor(model => model.Description)
        </div>
        <div>
            @Html.EditorFor(model => model.Description)
        </div>                   

        <table>
            <tr>
                <th>
                    Description
                </th>
                <th>
                    Quantity
                </th>
                <th>
                    Weight
                </th>
                <th>
                    Price
                </th>
                <th></th>
            </tr>
        @foreach (var line in Model.OrderLines)
        { 
            <tr>
                <td>
                    @Html.EditorFor(modelItem => line.Description)
                </td> 
                <td>
                    @Html.EditorFor(modelItem => line.Quantity)
                </td> 
                <td>
                    @Html.EditorFor(modelItem => line.Weight)
                </td> 
                <td>
                    @Html.EditorFor(modelItem => line.Price)
                </td>
            </tr>
        }
        </table>


        <p>
            <input type="submit" value="Save" />
        </p> 

    </fieldset>    
}

我能否就保存生产线数据和订单数据的最佳方法获得一些指导。

感谢。

Answer 1

您遇到的问题与ICollection<T>控件生成的名称有关。这是一个detailed discussion by Phil Haack和他的解决方案（根据 @Html扩展方法;从他博客文章末尾给出的链接下载示例项目）。这篇文章的目标是MVC / MVC2;但它仍然适用于MVC3。

或者，如果您不想遵循黑客攻击，则可以为EditorTemplate实体模型选择OrderLine。

以下是步骤。

1）在（Views ->Shared -> EditorTemplates -> OrderLine.cshtml）下创建编辑器模板在EditorTemplates下创建名为Shared的文件夹非常重要，模板名称应与要为其创建模板的EntityModel相同;因此名称为OrderLine.cshtml）

enter image description here

2） OrderLine.cshtml的代码

@model OrderTracker.Models.OrderLine
@{
    Layout = null;
}

<!DOCTYPE html>
@Html.HiddenFor(modelItem => Model.id)
<tr>
<td>
    @Html.EditorFor(modelItem => Model.Description)
</td> 
<td>
    @Html.EditorFor(modelItem => Model.Quantity)
</td> 
<td>
    @Html.EditorFor(modelItem => Model.Weight)
</td> 
<td>
    @Html.EditorFor(modelItem => Model.Price)
</td>
</tr>

3）使用此代码编辑您的视图（请注意，我已将EditorFor用于OrderLines集合）

@model OrderTracker.Models.Order

@{
    ViewBag.Title = "Edit";
}

<h2>Edit</h2>

@using (Html.BeginForm())
{
    <fieldset>
        <legend>Order</legend>   

        @Html.HiddenFor(model => model.ID)
        @Html.HiddenFor(model => model.UserId)

        <div>
            @Html.LabelFor(model => model.OrderDate)
        </div>
        <div>
            @Html.EditorFor(model => model.OrderDate)
        </div>
        <div>
            @Html.LabelFor(model => model.Description)
        </div>
        <div>
            @Html.EditorFor(model => model.Description)
        </div>                     
        <div>
        <table>
            <tr>
                <th>
                    Description
                </th>
                <th>
                    Quantity
                </th>
                <th>
                    Weight
                </th>
                <th>
                    Price
                </th>
            </tr>
            @Html.EditorFor(model => model.OrderLines)
            </table>
        </div>
        <p>
            <input type="submit" value="Save" />
        </p> 

    </fieldset>    
}

4）现在回帖后你会看到值

enter image description here

Answer 2

使用MVC它应该是相当直接的，因为框架旨在将表单转换为模型。

[HttpGet]
public ActionResult Edit(int id)
{
    // (you can probably rewrite this using a lambda
    var orderWithLines = from o in db.Orders.Include("OrderLines")
                         select o;

    // Use ViewData rather than passing in the object in the View() method.
    ViewData.Model = orderWithLines.FirstOrDefault(x => x.ID = id);
    return View();
}

[HttpPost]
public ActionResult Edit(OrderTracker.Models.Order model)
{
    if (ModelState.IsValid)
    {
        // call the service layer / repository / db to persist the object graph
        _service.Save(model); // this assumes your view models are the same as your domain
    }
}

Answer 3

问题在于您的foreach，如果您查看它生成的原始html，它将不会为每个订单行生成唯一的ID，因此在回发表单时将无法绑定模型。< / p>

将foreach更改为for循环，然后使用索引引用每个订单行。这将允许在表单中生成唯一ID，并允许您在回发模型时将其绑定到模型。

e.g。

@for (var counter = 0; counter < Model.OrderLines.Count(); counter++)

    { 
        <tr>
            <td>
                @Html.EditorFor(modelItem => Model.OrderLines[counter].Description)
            </td> 
            <td>
                @Html.EditorFor(modelItem => Model.OrderLines[counter].Quantity)
            </td> 
            <td>
                @Html.EditorFor(modelItem => Model.OrderLines[counter].Weight)
            </td> 
            <td>
                @Html.EditorFor(modelItem => Model.OrderLines[counter].Price)
            </td>
        </tr>
    }
    </table>

从MVC视图保存多个对象

3 个答案: