Question

//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; }
}

//定价

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 =＆gt; 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?)

任何人都知道，我该如何为ICollection＆lt;＆gt;绘制文本框？属性？

Answer 1

我建议您使用编辑器模板。

只需初始化控制器中的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);

然后在你的视图中简单地说：

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

然后只需为Pricing模型定义自定义编辑器模板（~/Views/Shared/EditorTemplates/Pricing.cshtml）：

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

简单。无需担心循环，无需担心索引，ASP.NET MVC框架将照顾一切。您需要做的就是遵循内置的约定。

Razor，TextBoxFor for ICollection属性

1 个答案: