如何在 Controller 到 razor 視圖中獲取相同類型的參數化值

Question

場景：我有兩個下拉菜單，當我點擊提交按鈕時，它需要在構造函數中獲取兩個“UserTableId”的int值，

問題：我無法理解我應該如何編寫它們以便我可以從下拉列表中獲取值。

創建/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????
    {...............}

用戶表數據庫表

Answer 1

由於您將問題標記為MVC ，因此您可以在視圖中使用 Model 綁定：

@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" })

加載視圖時，通過 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);
}

以及您的視圖 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 發布方法，更改為接受綁定到您的視圖的 model 類型：

//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
}