刚刚学习LINQ，我在测试项目中遇到了新手障碍。你能解释一下我做错了什么吗？publicListretrieveLists(intUserID){//Integrateuseridspecificationlater-needtoaddlistUsertablefirstIQueryablelists=fromlindb.ToDoListsselectnewToDoListInfo{ListID=l.ListID,ListName=l.ListName,Order=l.Order,Completed=l.Completed};returnlists.ToList;}我收到一条错误消息: