ConfigurationManager.RefreshSection("appSettings"); //刷新命名節
var startDate = DateTime.Parse(System.Configuration.ConfigurationManager.AppSettings["LastSyncProfitTime"]); //獲取配置
//記錄本次同步時間
System.Configuration.Configuration cfa = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
//修改配置節點
cfa.AppSettings.Settings["LastSyncProfitTime"].Value = endDate.ToString();
//保存
cfa.Save();