我已经为下面的模型，视图和控制器提供了代码。问题是：
我在数据库中有两个表，其中一个表示国家名称及其描述（国家表），另一个表格提供有关城市的信息（城市表）。
用于向City表添加新城市的表单需要有一个DropDownList，从中可以选择从Country传送的国家/地区，然后手动填写表单中的剩余数据并将其保存到City表。
型号：
namespace HarcodeASP.NETMVC5.Models
{
public class HarcodeCountry
{
public int id { get; set; }
[Required]
[StringLength(250)]
public string Title { get; set; }
[Required]
[DataType(DataType.MultilineText)]
public string Section { get; set; }
public string Time { get; set; }
public string UserAdd { get; set; }
public string UserEdit { get; set; }
}
public class HarcodeCity
{
public int id { get; set; }
[Required]
public string Country { get; set; }
[Required]
[StringLength(250)]
public string Title { get; set; }
[Required]
[StringLength(15)]
[DataType(DataType.PostalCode)]
public string Zip { get; set; }
public string Time { get; set; }
public string UserAdd { get; set; }
public string UserEdit { get; set; }
}
...
public class HarcodeDbContext : DbContext
{
public DbSet<HarcodeCountry> CountryDataset { get; set; }
public DbSet<HarcodeCity> CityDataset { get; set; }
public DbSet<HarcodeManufactor> ManufactorDataset { get; set; }
public DbSet<HarcodeGroup> GroupDataset { get; set; }
public DbSet<HarcodeSubgroup> SubgroupDataset { get; set; }
public DbSet<HarcodeItem> ItemDataset { get; set; }
public DbSet<HarcodeGallery> GalleryDataset { get; set; }
public DbSet<HarcodeAudio> AudioDataset { get; set; }
public DbSet<HarcodeVideo> VideoDataset { get; set; }
public DbSet<HarcodePdf> PdfDataset { get; set; }
public DbSet<ImgPath> ImgPathDataset { get; set; }
}
}
查看：
@using (Html.BeginForm())
{
@Html.AntiForgeryToken()
<div class="form-horizontal">
<hr />
@Html.ValidationSummary(true, "", new { @class = "text-danger" })
<div class="form-group">
@Html.LabelFor(model => model.Country, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
@Html.DropDownList("CityList", null, new { @class = "form-control", name = "HarcodeCountry.Title", id = "HarcodeCountry_Title" })
@*@Html.EditorFor(model => model.HarcodeCountry.Title, new { htmlAttributes = new { @class = "form-control" } })*@
@Html.ValidationMessageFor(model => model.Country, "", new { @class = "text-danger" })
</div>
</div>
...
<div class="form-group">
<div class="col-md-offset-2 col-md-10 btn-group">
<input type="submit" value="Create" class="btn btn-primary" />
@Html.ActionLink("Back to List", "Index", null, new { @class = "btn btn-default" })
</div>
</div>
</div>
}
控制器：
public class CityController : Controller
{
private HarcodeDbContext db = new HarcodeDbContext();
...
// GET: Citie/Create
public ActionResult Create()
{
var CountryQry = from d in db.CountryDataset orderby d.Title select d.Title;
var CountryList = new List<string>();
CountryList.AddRange(CountryQry);
ViewBag.CityList = new SelectList(CountryList);
return View();
}
// POST: Citie/Create
// To protect from overposting attacks, please enable the specific properties you want to bind to, for
// more details see http://go.microsoft.com/fwlink/?LinkId=317598.
[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Create([Bind(Include = "id,Country,Title,Zip,Time,UserAdd,UserEdit")] HarcodeCity harcodeCity)
{
if (ModelState.IsValid)
{
harcodeCity.Time = DateTime.Now.ToString();
harcodeCity.UserAdd = User.Identity.Name.ToString();
harcodeCity.UserEdit = User.Identity.Name.ToString();
db.CityDataset.Add(harcodeCity);
db.SaveChanges();
return RedirectToAction("Index");
}
return View(harcodeCity);
}
...
}