将IEnumerable类型转换成list类型

IEnumerable list1 = new List();
                    IEnumerable list2 = new List();
                    list1 = nWFProcessIBLL.GetMyTaskPageList(userInfo, paginationobj, queryJson, schemeCode);
                    list2 = nWFProcessIBLL.GetMyFinishTaskPageList(userInfo, paginationobj, queryJson, schemeCode);
                    List list3 = new List(list1);
                    list3.AddRange(list2);