Question

我正在编写一个asp.Net MVC应用程序，但我遇到了问题。我需要两个控件 - 一个是DropDownList，另一个是Button。

剃刀/ HTML：

c = (char)(c + 10)

CompanyController：

<h3 class="text-center margin">Parking Spaces in <strong>@Model.Company.Name</strong></h3>

@Html.DropDownListFor(r => r.UnassignedParkingSpaces, new SelectList(Model.UnassignedParkingSpaces, "Id", "Id"), new { @class = "form-control" })
<a class="btn btn-primary btn-block btn-sm button-width" onclick="location.href = '@Url.Action("Assign", "Company", new {buildingGuid = Model.BuildingGuid, companyGuid = Model.Company.Guid, parkingSpaceGuid =  })'">
<i class="fa fa-exchange"></i> @ResourcesGeneral.AssignButton
</a>

我在Html中使用的ViewController：

public ActionResult Assign(Guid parkingSpaceGuid, Guid companyGuid, Guid buildingGuid)
    {
        var building = _buildingReader.GetBuilding(buildingGuid);
        building.AssignParkingSpace(parkingSpaceGuid, companyGuid);

        return RedirectToAction("DisplayParkingSpaces", new { buildingGuid, companyGuid});
    }

停车位模型：

public class CompanyParkingSpacesViewModel
{
    public Guid BuildingGuid { get; set; }
    public AllParkingSpacesListViewModel AllParkingSpacesListViewModel { get; set ; }
    public Company Company { get; set; }
    public List<ParkingSpace> CompanyParkingSpaces { get; set; }
    public IEnumerable<ParkingSpace> UnassignedParkingSpaces { get; set; }
}

所以我需要传递给我在DropDownList中选择的按钮元素somy控制器具有所有参数。你怎么能这样做？

Answer 1

您需要将输入控件（SELECT元素）保存在表单中并提交表单。

您还使用DropDownListFor方法不正确。要显示下拉列表，您不需要使用ParkingSpace实体集合作为类型。您只需使用List<SelectListItem>类型即可。您还需要为所选选项值添加另一个属性。

public class CompanyParkingSpacesViewModel
{
    public Guid BuildingGuid { get; set; }
    public AllParkingSpacesListViewModel AllParkingSpacesListViewModel { get; set ; }
    public Company Company { get; set; }
    public List<ParkingSpace> CompanyParkingSpaces { get; set; }
    public IEnumerable<SelectListItem> UnassignedParkingSpaces { get; set; }
    public Guid SelectedParkingSpace { set;get;}
}

确保您正在加载GET操作中的数据

public ActionResult Assign()
{
  var  vm = new CompanyParkingSpacesViewModel();
  vm.UnassignedParkingSpace = db.ParkingSpaces
                               .Select(x=>new SelectListItem { Value = x.Guid.ToString(), 
                                                         Text=x.DescriptionHint }).ToList();
  //Assign other properties as well
  vm.Company=new Company();
  return View(vm);
}

现在以你的形式。

@model CompanyParkingSpacesViewModel
@using(Hml.BginForm("Assign","YourControllerName"))
{
   <label>Select a parking space </label>
   @Html.DropDownListFor(r => r.SelectedParkingSpace, 
           Model.UnassignedParkingSpace,new { @class = "form-control" })
  <input type="submit" value="Assign" />
}

确保您的操作方法参数名称与SELECT元素名称属性值匹配。

public ActionResult Assign(Guid SelectedParkingSpace, Guid companyGuid, 
                                                                          Guid buildingGuid)
{
    var building = _buildingReader.GetBuilding(buildingGuid);
    building.AssignParkingSpace(SelectedParkingSpace, companyGuid);
    return RedirectToAction("DisplayParkingSpaces", new { buildingGuid, companyGuid});
}

由于您的Assign操作方法代码需要buildingGuid和companyGuid，因此您需要将这些代码保留在表单中，以便在表单格式化时将其映射到方法参数提交。您可以将其保留在隐藏的输入字段中。

@using(Hml.BginForm("Assign","YourControllerName")
{
   <label>Select a parking space </label>
   @Html.DropDownListFor(r => r.SelectedParkingSpace, 
           Model.UnassignedParkingSpace,new { @class = "form-control" })

  <input type="hidden" name="companyGuid" value="@Model.Company.Guid" />
  <input type="hidden" name="buildingGuid" value="@Model.BuildingGuid" />
  <input type="submit" value="Assign" />
}

DropDownList项

1 个答案: