從C＃中的SelectList中刪除項目

Question

我有一個方法，其中返回我selectList。 selectList的某些項目將基於Key以編程方式刪除。

 public SelectList GetRoutingActionList()
    {
        Dictionary<string, string> routingActions = new Dictionary<string, string> { 
                                                        { "Approved", "Approve" },
                                                        { "Return To", "Return To .." }, 
                                                        { "Return To Sender", "Return To Sender" }, 
                                                        { "Disapprove", "Disapprove" },
                                                        { "Set On Hold", "Set On Hold" } 
                                                    };

        SelectList routingActionList = new SelectList(routingActions, "Key", "Value");
        return routingActionList;
    }

對於eaxmple，我必須使用Key“Disapprove”刪除該項目。 任何人都可以幫助我解決這個問題。

Answer 1

你必須使用Where()來過濾它們，然后將List<SelectListItem>返回對象傳遞給SelectList構造函數，以獲得新的SelectList，它不具有值為“Disapprove”的項目：

public class SomeController
{

   public ActionResult Index()
   {

       SelectList list = GetRoutingActionList();

       list  = new SelectList(list 
                              .Where(x => x.Value != "Disapprove")
                              .ToList(),
                              "Value",
                              "Text");

        return View();
   }

}

Answer 2

public SelectList GetRoutingActionList()
    {
        Dictionary<string, string> routingActions = new Dictionary<string, string> { 
                                                        { "Approved", "Approve" },
                                                        { "Return To", "Return To .." }, 
                                                        { "Return To Sender", "Return To Sender" }, 
                                                        { "Disapprove", "Disapprove" },
                                                        { "Set On Hold", "Set On Hold" } 
                                                    };

        SelectList routingActionList = new SelectList(routingActions, "Key", "Value");
        return routingActionList.Where(x => x.Key != "Disapprove")
                                   .ToList();
}

Answer 3

只需將其從字典中刪除即可 作為參考，它將自動從SelectList中刪除。

routingActions.Remove("Disapprove");