在asp.net中創建新的數據庫記錄時出錯mvc

Question

我是新來的asp.net mvc。然而，這是我做了什麼：

在控制器中，

  public ActionResult Create() 
    { 


     return View(); 
    } 

    // 
    // POST: /Customerservice/Create 

    [HttpPost] 
    public ActionResult Create([Bind(Exclude="CustomerServiceMappingID")] Maping serviceToCreate) 
    { 
     if (!ModelState.IsValid) 

       return View(); 

      var dc = new ServicesDataContext(); 

      dc.Mapings.InsertOnSubmit(serviceToCreate); 
      dc.SubmitChanges(); 
      return RedirectToAction("Index","Home"); 
    } 

觀是這樣的：

 @Html.DropDownListFor(model => model.Status, new SelectList(new List<object> 
             {new {value="Active" , text="Active"}, 
             new {value="Pending", text="Pending" }, 
             new {value="Disabled", text="Disabled"}}, "value", "text", Model.Status)) 

有4個領域。但是，當我嘗試使用狀態，我得到一個異常說「對象引用未設置爲對象的實例」

Answer 1

在GET操作，你需要通過模型視圖：

public ActionResult Create() 
{ 
    // the model could also be fetched from the DB given 
    // an unique ID passed as argument to this action 
    var model = new Maping(); 
    return View(model); 
}