C#实现从网络同步标准北京时间的方法

#region/// <summary>/// 获取标准北京时间/// /// </summary>/// /// <returns></returns>///public static DateTime GetStandardTime()   {/// //<?xml version="1.0" encoding="GB2312" ?>//- <ntsc>//- <time>// <year>2013</year>// <month>8</month>// <day>29</day> // <Weekday /> // <hour>16</hour>// <minite>29</minite>// <second>12</second> // <Millisecond />// </time> // </ntsc> DateTime dt;WebRequest wrt = null;WebResponse wrp = null;try{wrt = WebRequest.Create("http://www.time.ac.cn/timeflash.asp?user=flash"); wrt.Credentials = CredentialCache.DefaultCredentials;  wrp = wrt.GetResponse();  StreamReader sr = new StreamReader(wrp.GetResponseStream(),Encoding.UTF8);  string html = sr.ReadToEnd();  sr.Close();  wrp.Close();  int yearIndex = html.IndexOf("<year>") + 6;  int monthIndex = html.IndexOf("<month>") + 7;  int dayIndex = html.IndexOf("<day>") + 5;  int hourIndex = html.IndexOf("<hour>") + 6;  int miniteIndex = html.IndexOf("<minite>") + 8;  int secondIndex = html.IndexOf("<second>") + 8;  string year = html.Substring(yearIndex, html.IndexOf("</year>") - yearIndex);  string month = html.Substring(monthIndex, html.IndexOf("</month>") - monthIndex);  string day = html.Substring(dayIndex, html.IndexOf("</day>") - dayIndex);  string hour = html.Substring(hourIndex, html.IndexOf("</hour>") - hourIndex);  string minite = html.Substring(miniteIndex, html.IndexOf("</minite>") - miniteIndex);  string second = html.Substring(secondIndex, html.IndexOf("</second>") - secondIndex);  dt = DateTime.Parse(year + "-" + month + "-" + day + " " + hour + ":" + minite + ":" + second);}catch (WebException){  return DateTime.Parse("2013-1-1");}catch (Exception){  return DateTime.Parse("2013-1-1");}finally{  if (wrp != null) wrp.Close();  if (wrt != null) wrt.Abort();}   return dt; }#endregion