ASP.NET MVC + Populate dropdownlist

问题

In my viewModel I have:

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

But what do I have to do in my Controller/View to show the values? What I have now:
Controller:

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

View:

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

But it gives an error like this:

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?)

回答1:

Your ViewModel has a property of type 'IEnumerable', but SelectList does not satisfy that type. Change your code like this:

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

View:

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

回答2:

You are creating SelectList instance twice. Get rid of one of them:

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

来源：https://stackoverflow.com/questions/20567364/asp-net-mvc-populate-dropdownlist

标签

ASP.NET

asp.net-mvc

asp.net-mvc-4

html.dropdownlistfor