ASP.NET MVC实现下拉框多选_实用技巧_

 public class City { public int Id { get; set; } public string Name { get; set; } public bool IsSelected { get; set; } }

 public class CityVm { public IEnumerable Cities { get; set; } public IEnumerable SelectedCities { get; set; } }

 public class HomeController : Controller { public ActionResult Index() { var cities = new List { new City(){Id = 1, Name = "青岛", IsSelected = true}, new City(){Id = 2, Name = "胶南", IsSelected = false}, new City(){Id = 3, Name = "即墨", IsSelected = true}, new City(){Id = 4, Name = "黄岛", IsSelected = false}, new City(){Id = 5, Name = "济南", IsSelected = false} }; var citiesToPass = from c in cities select new SelectListItem() {Text = c.Name, Value = c.Id.ToString(),Selected = c.IsSelected}; CityVm cityVm = new CityVm(); cityVm.Cities = citiesToPass; ViewData["cc"] = citiesToPass.Count(); return View(cityVm); } ...... }

@model MvcApplication1.Models.CityVm @{ ViewBag.Title = "Index"; Layout = "~/Views/Shared/_Layout.cshtml"; } 
Index
 @using (Html.BeginForm("GetCities", "Home", FormMethod.Post, new {id = "myForm"})) { @Html.ListBoxFor(c => c.SelectedCities, Model.Cities, new {size = ViewData["cc"]}) 
 }

 public class HomeController : Controller { ...... [HttpPost] public ActionResult GetCities(IEnumerable selectedCities) { if (selectedCities == null) { return Content("没有选中任何选项"); } else { StringBuilder sb = new StringBuilder(); sb.Append("选中项的Id是：" + string.Join(",", selectedCities)); return Content(sb.ToString()); } } }