ASP.NET MVC +填充下拉列表

Question

在我的viewModel中我有:

public class PersonViewModel
{
    public Person Person { get; set; }
    public int SelectRegionId { get; set; }
    public IEnumerable<SelectListItem> Regions { get; set; }
}

但是我在Controller/View中需要做些什么来显示值？我现在拥有的:
控制器:

public ActionResult Create()
{
     var model = new ReUzze.Models.PersonViewModel
     {
         Person = new Person(),
         Regions = new SelectList(this.UnitOfWork.RegionRepository.Get(), "Id", "Name")
     };
     return View(model);
}

视图:

 <div class="form-group">
     @Html.LabelFor(model => model.Person.Address.Region)
     @Html.DropDownListFor(model => model.SelectRegionId, new SelectList(Model.Regions, "Id", "Name"), "Choose... ")
 </div>

但它给出了这样的错误:

Cannot implicitly convert type 'System.Web.Mvc.SelectList' to 'System.Collections.Generic.IEnumerable<System.Web.WebPages.Html.SelectListItem>'. An explicit conversion exists (are you missing a cast?)

Answer 1

您的ViewModel具有"IEnumerable"类型的属性,但SelectList不满足该类型.像这样更改你的代码:

public class PersonViewModel
{
    public Person Person { get; set; }
    public int SelectRegionId { get; set; }
    public SelectList Regions { get; set; }
}

视图:

<div class="form-group">
     @Html.LabelFor(model => model.Person.Address.Region)
     @Html.DropDownListFor(model => model.SelectRegionId, Model.Regions, "Choose... ")
 </div>

Answer 2

您正在创建两次SelectList实例.摆脱其中一个:

@Html.DropDownListFor(model => model.SelectRegionId, Model.Regions, "Choose... ")