public int WriteExitLog(int LogId, DateTime dt) { string sql = "Update LoginLogs set ExitTime=@dt where LogId=@LogId"; SqlParameter[] param = new SqlParameter[] { new SqlParameter("@dt", dt), new SqlParameter("@LogId", LogId) }; try { return(SQLHelp.Update(sql, param)); } catch (SqlException ex) { throw new Exception("应用程序与数据库连接出错,具体内容: " + ex.Message); } catch (Exception ex) { throw ex; } }