public string GetOneHisList([FromBody]History history) { if (history.Start_Date > history.End_Date) return ""; DateTime beijing = DateTime.Now.ToUniversalTime().AddHours(8); var html = ""; if (history.Start_Date.Year == 1 || history.End_Date.Year == 1 || history.Start_Date < beijing.AddMonths(-3)) { history.Start_Date = beijing.AddMonths(-3); history.End_Date = beijing; } MysqlHelper mysqlhelper = new MysqlHelper(); List<History> his_list = mysqlhelper.GetAccountHistory(history); foreach (History his in his_list) { html += string.Format("<tr><td>{0}</td><td>{1}</td><td>{2}</td><td>{3}</td></tr>", his.Type, his.Start_Date,his.Amount, his.Currency); } return html; }