如何在 Controller 到 razor 视图中获取相同类型的参数化值

Question

场景：我有两个下拉菜单，当我点击提交按钮时，它需要在构造函数中获取两个“UserTableId”的int值，

问题：我无法理解我应该如何编写它们以便我可以从下拉列表中获取值。

创建/查看

 <div class="form-group  row">
  <label>User Id</label>
  <div class="col-md-10">
 @Html.DropDownList("UserTableId", null, htmlAttributes: new { @class = "btn  btn-primary" })
 @Html.ValidationMessageFor(model => model.UserTable.User_id, "", new { @class = "text-danger" })
                </div>
          </div>



<div class="form-group  row">
 <label>User Id</label> 
    <div class="col-md-10">
     @Html.DropDownList("UserTableId", null, htmlAttributes: new { @class = "btn  btn-primary"})
     @Html.ValidationMessageFor(model => model.UserTable.User_id, "", new { @class = "text-danger" })
         </div>
  </div>

Controller

public ActionResult ShowAllDetail(int UserTableId,int UserTableId)     //how should I pass the same parameter or whats the solution????
    {...............}

用户表数据库表

Answer 1

由于您将问题标记为MVC ，因此您可以在视图中使用 Model 绑定：

@model SomePOCOModel

然后使用：

@Html.DropDownListFor(x => Model.UserTableId1, Model.UserTable),
                    "--Select User--",
                    new { @class = "btn  btn-primary" })

@Html.DropDownListFor(x => Model.UserTableId2, Model.UserTable),
                    "--Select User--",
                    new { @class = "btn  btn-primary" })

加载视图时，通过 Model：

public ActionResult Index()
{
   SomePOCOModel myModel = new SomePOCOModel();
   //Set the property UserTable to an IEnumerable<SelectListItem> 
   //built using your DB user table
   return View("Index", myModel);
}

以及您的视图 Model：

public class SomePOCOModel()
{
    public int UserTableId1 {get; set;}
    public int UserTableId2 {get; set;}
    public IEnumerable<SelectListItem> UserTable {get; set;}
}

最后，您的 controller 发布方法，更改为接受绑定到您的视图的 model 类型：

//Accept the model type bound to your View
[HttpPost]
[ValidateAntiForgeryToken] //Use this if placing an antiforgery token in your form
public ActionResult ShowAllDetail(SomePOCOModel myModel)
{
   //Do something with the drop down selections
   //myModel.UserTableId1
   //myModel.UserTableId2
}