C#实现从网络同步标准北京时间的方法

本文实例讲述了c#实现从网络同步标准北京时间的方法。分享给大家供大家参考。具体分析如下：

这段c#代码可以从http://www.time.ac.cn网站上获取标准的北京时间，只需简单的组合即可让本地服务器实时同步正确的北京时间

#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

希望本文所述对大家的c#程序设计有所帮助。