無法在C＃中刪除通用列表對象

Question

SessionResponseList objClientSessionResponseList = new SessionResponseList();
objClientSessionResponseList.QId = Convert.ToInt32(Session["QuestionNumber"]);
objClientSessionResponseList.QAnswer = Session["CurrentAnswer"].ToString();
objSessionResponseList = (List<SessionResponseList>)Session["Answers"];
if (objSessionResponseList.Where(x=>x.QId == objClientSessionResponseList.QId && x.QAnswer==objClientSessionResponseList.QAnswer).Count()>0)
{
    objSessionResponseList.Remove(objClientSessionResponseList);
    Session["Answers"] = objSessionResponseList;

}
//  objSessionResponseList.Remove(objClientSessionResponseList); 
//This isn't working tried everything the values are exact duplicate

請幫忙。

 public class SessionResponseList{

    public int QId { get; set; }
    public string QAnswer { get; set; }
}

Answer 1

與其創建一個新實例， FirrstOrDefault嘗試使用FirrstOrDefault從列表中獲取該實例，如果找到該實例，則將該實例從列表中刪除，當前您正在創建一個新對象，並試圖將其從列表中刪除。

var itemToBeRemoved = objSessionResponseList
                    .FirstOrDefault(x=> 
                    x.QId == Convert.ToInt32(Session["QuestionNumber"]) &&
                    x.QAnswer == Session["CurrentAnswer"].ToString();

if(itemToBeRemoved != null) //means item is found in the list
    objSessionResponseList.Remove(itemToBeRemoved)