1

//产品

public class Product
{
    [Key]
    public int ID {get; set;}
    public string PK {get; set;}

    [Required(ErrorMessage="Category is required field.")]
    public int CategoryID { get; set; }

    [Required]
    public string Title {get; set;}

    public virtual ICollection<Pricing> Pricing { get; set; }
}

// 价钱

public class Pricing
{
    [Key]
    public int ID {get; set;}
    public int ProductID {get; set;}
    public decimal Price {get; set;}
    public int OrderQty {get; set;}
    public string PK { get; set; }
}

我喜欢上面的实体表，我想在更新产品页面中为 ICollection 绘制 5 个文本框。但我不知道，我该怎么做。

@model BrownieDAL.Entities.Product


<th> Price / Order Qty</th>
<td>
    @{int priceCnt = 0;}
    @foreach(var price in Model.Pricing){
        priceCnt++;
        @Html.TextBoxFor(model => price.Price)
        @Html.TextBoxFor(model => price.OrderQty)
        <br />
    }
    @if (priceCnt < 5)
    {
        // ??? 
        @Html.TextBoxFor(Model.Pricing => Model.Pricing.Price)
        priceCnt++;
    }
</td>

当我尝试使用“@Html.TextBoxFor(Model.Pricing => Model.Pricing.Price)”时，我收到一条错误消息：

Error   1   'System.Collections.Generic.ICollection<PJ.Entities.Pricing>' does not contain a definition for 'Price' and no extension method 'Price' accepting a first argument of type 'System.Collections.Generic.ICollection<PJ.Entities.Pricing>' could be found (are you missing a using directive or an assembly reference?)

有人知道，我应该如何为 ICollection<> 属性绘制文本框？

4

1 回答 1

4

我建议您使用编辑器模板。

因此，只需在控制器中初始化Pricing集合，然后将其完成为 5 个元素：

model.Pricing = ... go get the pricing collection from wherever you were getting it previously
int count = model.Pricing.Count();
if (count < 5)
{
    // we have less than 5 elements in the collection => let's complete it
    // with empty Pricing elements:
    var emptyItems = Enumerable.Range(1, 5 - count).Select(x => new Pricing());
    model.Pricing = model.Pricing.Concat(emptyItems).ToList();
}
return View(model);

然后在您的视图中简单地：

@model BrownieDAL.Entities.Product
<table>
    <thead>
        <tr>
            <th>Price / Order Qty</th>
        </tr>
    </thead>
    <tbody>
        @Html.EditorFor(model => model.Pricing)
    </tbody>
</table>

然后简单地为Pricing模型定义一个自定义编辑器模板（~/Views/Shared/EditorTemplates/Pricing.cshtml）：

@model BrownieDAL.Entities.Pricing
<tr>
    <td>
        @Html.TextBoxFor(model => model.Price)
        @Html.TextBoxFor(model => model.OrderQty)
    </td>
</tr>

很简单。无需担心循环，无需担心索引，ASP.NET MVC 框架会处理所有事情。您需要做的就是简单地遵循内置的约定。

于 2013-02-19T15:33:10.057 回答