MVC3 Razor @Html.DropDownListFor [英] MVC3 Razor @Html.DropDownListFor

问题描述

我可以使用一些帮助来实现@Html.DropDownListFor.我的目标是按类别过滤产品列表.

I could use some help implementing @Html.DropDownListFor. My objective is to filter the list of Products by Category.

此代码将显示一个列表框:

This code will display a list box:

@model IEnumerable<Sample.Models.Product>
@{
    List<Sample.Models.Category> list = ViewBag.Categories;
    var items = new SelectList(list, "CategoryID", "CategoryName");

}
@Html.DropDownList("CategoryID", items)

但是我无法让 @Html.DropDownListFor 工作:

But I'm having trouble getting @Html.DropDownListFor to work:

@model IEnumerable<Sample.Models.Product>
@{
    List<Sample.Models.Category> list = ViewBag.Categories;
    var items = new SelectList(list, "CategoryID", "CategoryName");

}
@Html.DropDownListFor(???, @items)

我可以使用一些帮助来构建 @Html.DropDownListFor 的 Linq 部分.这是模型:

I could use some help constructing the Linq portion of @Html.DropDownListFor. Here is the model:

public class Product
{
    public int ProductID { get; set; }
    public string ProductName { get; set; }
    public int CategoryID { get; set; }
    public string QuantityPerUnit { get; set; }
    public Decimal? UnitPrice { get; set; }
    public short UnitsInStock { get; set; }

    public virtual Category Category { get; set; }
}

public class Category
{
    public int CategoryID { get; set; }
    public string CategoryName { get; set; }

    public virtual ICollection<Product> Products { get; set; }

}

推荐答案

您的视图是强类型的产品集合，因此我想您需要为每个产品设置一个下拉列表.如果是这种情况，编辑器模板将起作用:

Your view is strongly typed to a collection of products so I suppose that you need a drop down for each product. If this is the case an editor template would work:

@model IEnumerable<Sample.Models.Product>
@Html.EditorForModel()

然后在 ~/Views/Shared/EditorTemplates/Product.cshtml

@model Sample.Models.Product
@{
    List<Sample.Models.Category> list = ViewBag.Categories;
    var items = new SelectList(list, "CategoryID", "CategoryName");
}
@Html.DropDownListFor(x => x.CategoryID, @items)

这篇关于MVC3 Razor @Html.DropDownListFor的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！