为什么我的@Html.DropDownListFor()中没有显示正确的值

本文关键字:显示 @Html 我的 DropDownListFor 为什么 | 更新日期: 2023-09-27 18:24:37

我是.NET MVC的初学者,正在尝试执行一项简单的任务,例如在下拉列表中显示项目列表。然而,我当前的代码会生成一个下拉列表,显示项目类型的名称,而不是实际值。谢谢你帮忙。:)

DropDown未显示正确的值

我的代码如下;

选择ArticleModel.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
namespace TheMakingOfAWebApplication.Models
{
    public class SelectArticleModel
    {
        public string Name { get; set; }
        public IEnumerable<Article> Articles { get; set; }
    }
}

条款.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
namespace TheMakingOfAWebApplication.Models
{
    public class Article
    {
        public string Name { get; set; }
    }
}

HomeController.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using TheMakingOfAWebApplication.Models;
namespace TheMakingOfAWebApplication.Controllers
{
    public class HomeController : Controller
    {
        // GET: Home
        public ActionResult Index()
        {
            //List<Article> articles;
            SelectArticleModel model = new SelectArticleModel();
            model.Name = "";
            model.Articles = new List<Article>{
                new Article { Name = "Bananas"},
                new Article { Name = "Apples"},
                new Article { Name = "Oranges"},
                new Article { Name = "Melons"},
                new Article { Name = "Grapes"},
                new Article { Name = "Sallad"},
                new Article { Name = "Potatoes"},
                new Article { Name = "Cucumber"},
                new Article { Name = "Beans"},
                new Article { Name = "Tomatoes"}
            };
            return View(model);
        }
    }
}

索引.cshtml

@model TheMakingOfAWebApplication.Models.SelectArticleModel
@{
    ViewBag.Title = "Index";
}
<h2>Index</h2>
@using (Html.BeginForm())
{
    @Html.AntiForgeryToken()
    <div class="form-horizontal">
        <h4>Article</h4>
        <hr />
        @Html.ValidationSummary(true, "", new { @class = "text-danger" })
        <div class="form-group">
            @Html.LabelFor(model => model.Name, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.DropDownListFor(m => m.Name, new SelectList(Model.Articles))) 
                @Html.ValidationMessageFor(model => model.Name, "", new { @class = "text-danger" })
            </div>
        </div>
        <div class="form-group">
            <div class="col-md-offset-2 col-md-10">
                <input type="submit" value="Save" class="btn btn-default" />
            </div>
        </div>
    </div>
}
<div>
    @Html.ActionLink("Back to List", "Index")
</div>

为什么我的@Html.DropDownListFor()中没有显示正确的值

SelectList知道Value和Text属性的名称。

@Html.DropDownListFor(m => m.Name, 
                 new SelectList(Model.Articles, "Name", "Name", Model.Name)))

由于使用复杂对象进行绑定,因此可以将dataTextField和dataValueField指定为SelectList的参数。尝试以下操作:

@Html.DropDownListFor(m => m.Name, new SelectList(Model.Articles,"Name","Name"))

如果您有一个基元类型(如字符串)的列表,那么您正在使用的SelectList的重载将在不提及额外参数的情况下工作。