我想构建一个空的 Dropdownlistfor 来接收先前 Dropdownlisfor 选择的结果:
实际 View :
<div id="makes">
@Html.DropDownListFor(m => m.Make_Id, Model.MakeList, HeelpResources.DropdownlistMakeFirstRecord)
</div>
<div id="models">
@Html.DropDownListFor(m => m.Model_Id, Model.ModelList, HeelpResources.DropdownlistModelFirstRecord)
</div>
实际的 Controller (为了工作，我必须构建一个空的 SelectedList，但必须这样做似乎很奇怪):
public virtual ActionResult Create()
{
// Build the Dropdownlist for the Makes
var makesDto = _makeService.ListAllMakes();
var makesViewModel = Mapper.Map<IList<MakeDto>, IList<MakeViewModel>>(makesDto);
// Build the Dropdownlist for the Models
var makeId = -1;
var modelsDto = _modelService.ListModelByMake(makeId);
var modelsViewModel = Mapper.Map<IList<ModelDto>, IList<ModelViewModel>>(modelsDto);
// Build the ViewModel to return to the View
CreateAdViewModel viewModel = new CreateAdViewModel();
viewModel.MakeList = new SelectList(makesViewModel, "ID", "Name");
viewModel.ModelList = new SelectList(modelsViewModel, "ID", "Name");
return View(viewModel);
}
有没有办法构建这样的东西: @Html.DropDownListFor(m => m.Model_Id, null)
并从 Controller 中删除//Build the Dropdownlist for the Models？
谢谢
最佳答案
找到了一个我认为最好的解决方案，因为它不需要服务调用来构建空的 dropdroplist，并且它是强类型的:
@Html.DropDownListFor(m => m.Model_Id, Enumerable.Empty<SelectListItem>(), HeelpResources.DropdownlistModelFirstRecord)
关于asp.net-mvc - 为级联子列表构建一个空的 MVC DropdownListFor，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/13051228/