public string GetHisList([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.GetHistory(history); foreach (History his in his_list) { html += string.Format("<tr><td>{0}</td><td>{1}</td><td>{2}</td><td>{3}</td><td>{4}</td></tr>",his.Type,his.From,his.To,his.Amount+" "+his.Currency,his.Start_Date); } return html; }