var duanxin1 = new DuanXin();
                duanxin1.RECEIVE_LOGIN_NAME = "dd";
                duanxin1.RECEIVE_Number = "123";

                IList<DuanXin> pList_duanxin = new List<DuanXin>();
                pList_duanxin.Add(duanxin1);
                pList_duanxin.Add(duanxin1);
                pList_duanxin.Add(duanxin1);
                //Object To Json
                var  JsonList=   JsonConvert.SerializeObject(pList_duanxin);
                //Json To List 
                var pObjListFromJson = JsonConvert.DeserializeObject<IList<duanxin>>(JsonList);
               
                if (args == null)
                {
                    throw new ArgumentNullException(nameof(args));
                }

　　.net 中 處理json 與List 互轉 需要 引用

DuanXin 代碼如下：

.net 中 Json 與List 相互轉