Question

我有下拉列表，我已从数据库中填写。现在我需要在Controller中获取所选值进行一些操作。但没有得到这个想法。

模型/ UserManageClass.cs

public class UserManageClass
{
    // Set Stored Procedure Results to Array
    public sp_GetAllDeveloperType_Result dv { get; set; }
    public IEnumerable<sp_GetAllDeveloperType_Result> dvi { get; set; }
}

控制器/ ResourceController.cs

public static db_RIROEntities db_RIRO = new db_RIROEntities();
public static UserManageClass model = new UserManageClass();

public ActionResult NewUser()
{
  model.dv = db_RIRO.sp_GetAllDeveloperType().FirstOrDefault();
  model.dvi = db_RIRO.sp_GetAllDeveloperType();
}
[HttpPost]
// Insert User
public void AddUser(ResourceViewModel resourceInfo)
{

 }

视图

using (@Html.BeginForm("AddUser", "Resource", FormMethod.Post))
{ 
@model OnlineRIRO.Models.UserManageClass
@* Display DropDownList for Developer Type *@

@Html.DropDownListFor(x => x.dv.DeveloperTypeID, new SelectList(Model.dvi, "DeveloperTypeID", "Developer_Type"), new { @class = "form-control input-sm" })

<div class="col-md-4">
    <div class="form-group col-lg-12">
        <label class="lb-sm">Last Name</label>
        <input type="text" name="txtLastName" placeholder="Last Name" class="form-control input-sm">
    </div>
</div>

<div class="col-md-4">
    <div class="form-group col-lg-12">
        <label class="lb-sm">First Name</label>
        <input type="text" name="txtFirstName" placeholder="First Name" class="form-control input-sm" id="" value="">
    </div>
</div> 
}

如何将DropDownList中的Selected Value传递给ResourceViewModel？

ResourceViewModel

public class ResourceViewModel
{
    public string FirstName {get; set;}
    public string LastName {get; set;}
}

Answer 1

您的视图模型应该是表示视图所需属性的类。因此，如果要在视图中添加下拉列表，请向viewmodel添加2个属性，一个用于构建选择选项所需的项目列表，另一个用于所选选项值。

public class ResourceViewModel
{
    public int DeveloperTypeId { set;get;}
    public List<SelectListItem> DeveloperTypes { set;get;}

    public string FirstName {get; set;}
    public string LastName {get; set;}
}

现在在您的GET操作中，创建此视图模型的对象，初始化DeveloperTypes集合属性并将对象发送到视图。

public ActionResult NewUser()
{
   var vm = new ResourceViewModel();
   vm.DeveloperTypes = db_RIRO.sp_GetAllDeveloperType()
                              .Select(a=> new SelectListItem { 
                                               Value = a.DeveloperTypeID.ToString(), 
                                               Text= a.Developer_Type })
                              .ToList();
   return View(vm);
}
[HttpPost]
public void AddUser(ResourceViewModel model)
{
   //check model.DeveloperTypeId
   // to do : Return something
}

假设db_RIRO.sp_GetAllDeveloperType()返回DeveloperTypeID属性int类型和Developer_Type string类型的对象集合。

现在在您看来，您可以使用DropDownListFor帮助

@model ResourceViewModel
@using(Html.BeginForm("AddUser","Resource"))
{
   @Html.LabelFor(a=>a.FirstName)
   @Html.TextBoxFor(a=>a.FirstName)

   @Html.LabelFor(a=>a.LastName)
   @Html.TextBoxFor(a=>a.LastName)

   @Html.LabelFor(a=>a.DeveloperTypeId)
   @Html.DropDownListFor(a=>a.DeveloperTypeId, Model.DeveloperTypes,"Select");

   <button type="submit" class="btn">Submit</button>
}

如何在MVC中获取DropDownList选择的值

1 个答案: