namespace MvcApplication1.Models
{
    public class CarFan
    {
        public int Id { get; set; }
        public string Name { get; set; }
        public string[] SelectedCars { get; set; }
    }
}

以上，在"ASP.NET MVC實(shí)現(xiàn)多選下拉框"中也提到了，當(dāng)我們通過(guò)<select multiple="multiple"...></select>顯示多選下拉框的時(shí)候，其對(duì)應(yīng)的Model屬性類(lèi)型一定是string[]。

關(guān)于汽車(chē)品牌的Model：

namespace MvcApplication1.Models
{
    public class Car
    {
        public int Id { get; set; }
        public string Name { get; set; }
    }
}

創(chuàng)建FanController：

using System.Collections.Generic;
using System.Linq;
using System.Web.Mvc;
using MvcApplication1.Models;

namespace MvcApplication1.Controllers
{
    public class FanController : Controller
    {

        public ActionResult SaveCars()
        {
            var carFan = new CarFan() {Id = 1, Name = "Darren", SelectedCars = {}};
            ViewBag.allcars = GetAllCars();
            return View(carFan);
        }

        [HttpPost]
        public ActionResult SaveCars(CarFan carFan)
        {
            //if (ModelState.IsValid)
            //{
            //    foreach (var item in carFan.SelectedCars)
            //    {
            //        //TODO:把選中的Car的編號(hào)和CarFan保存到中間表
            //    }
            //}
            ViewBag.allcars = GetAllCars();
            return View(carFan);
        }

        private IEnumerable<SelectListItem> GetAllCars()
        {
            List<SelectListItem> allCars = new List<SelectListItem>();
            allCars.Add(new SelectListItem() { Value = "1", Text = "奔馳" });
            allCars.Add(new SelectListItem() { Value = "2", Text = "寶馬" });
            allCars.Add(new SelectListItem() { Value = "3", Text = "奇瑞" });
            allCars.Add(new SelectListItem() { Value = "4", Text = "比亞迪" });
            allCars.Add(new SelectListItem() { Value = "5", Text = "起亞" });
            allCars.Add(new SelectListItem() { Value = "6", Text = "大眾" });
            allCars.Add(new SelectListItem() { Value = "7", Text = "斯柯達(dá)" });
            allCars.Add(new SelectListItem() { Value = "8", Text = "豐田" });
            allCars.Add(new SelectListItem() { Value = "9", Text = "本田" });

            return allCars.AsEnumerable();
        }

顯示<select multiple="multiple"...></select>的時(shí)候，需要一個(gè)IEnumerable<SelectListItem>類(lèi)型的集合，我們通過(guò)ViewBag把該類(lèi)型集合傳遞到前臺(tái)視圖。

打上[HttpPost]的SaveCars(CarFan carFan)方法內(nèi)部，在實(shí)際項(xiàng)目中，本該是需要遍歷所有選中汽車(chē)品牌的Id,把CarFan的Id和汽車(chē)品牌的Id保存到兩者的中間表的，但這里為了方便，保存成功后還是回到原先的/Fan/SaveCars.cshtml視圖，把選中的項(xiàng)顯示出來(lái)。

/Fan/SaveCars.cshtml 視圖

@model MvcApplication1.Models.CarFan

@{
    ViewBag.Title = "SaveCars";
    Layout = "~/Views/Shared/_Layout.cshtml";
}
<link href="~/Content/chosen.css" rel="external nofollow"  rel="stylesheet" />

<h2>@Model.Name 感興趣的汽車(chē)品牌包括：(最多選擇2個(gè))</h2>

@using (Html.BeginForm("SaveCars", "Fan", FormMethod.Post, new {id="editForm"}))
{
    @Html.ListBoxFor(m => m.SelectedCars, (IEnumerable<SelectListItem>)ViewBag.allcars, new {@class="chosen", multiple="multiple", style="width:350px;"}) <br/>
    <input type="submit" value="提交"/>
}


@section scripts
{
    <script src="~/Scripts/chosen.jquery.min.js"></script>
    <script type="text/javascript">
        $(function() {
            $('.chosen').chosen({
                max_selected_options: 2
            });

            $(".chosen-deselect").chosen(
            {
                allow_single_deselect: true 
            });

            $(".chosen").chosen().change();
            $(".chosen").trigger('liszt:updated');
        });
    </script>
}

運(yùn)行，在沒(méi)有選擇任何項(xiàng)時(shí)的界面如下：