C#同步网络时间

客户的机器的系统时间经常出错，导致给他们做的软件无法正常使用，所以后来就加了一个同步网络时间的小功能。实现起来很简单，但是却很使用。

这个小功能就是先获取网络时间，然后将系统的时间修改成从网络获得的时间。下面是具体的实现：

获取网络时间：

using System;  using System.Collections.Generic;  using System.Linq;  using System.Text;  using System.IO;  using System.Net;  using System.Net.Sockets;  using System.Text.RegularExpressions;  using System.Runtime.InteropServices;using System.Runtime;        /// <summary>      /// 网络时间      /// </summary>      public class NetTime    {               /// <summary>          /// 获取标准北京时间，读取http://www.beijing-time.org/time.asp          /// </summary>          /// <returns>返回网络时间</returns>          public DateTime GetBeijingTime()        {                     DateTime dt;            WebRequest wrt = null;            WebResponse wrp = null;            try            {                wrt = WebRequest.Create("http://www.beijing-time.org/time.asp");                wrp = wrt.GetResponse();                string html = string.Empty;                using (Stream stream = wrp.GetResponseStream())                {                    using (StreamReader sr = new StreamReader(stream, Encoding.UTF8))                    {                        html = sr.ReadToEnd();                    }                }                string[] tempArray = html.Split(';');                for (int i = 0; i < tempArray.Length; i++)                {                    tempArray[i] = tempArray[i].Replace("\r\n", "");                }                string year = tempArray[1].Split('=')[1];                string month = tempArray[2].Split('=')[1];                string day = tempArray[3].Split('=')[1];                string hour = tempArray[5].Split('=')[1];                string minite = tempArray[6].Split('=')[1];                string second = tempArray[7].Split('=')[1];                dt = DateTime.Parse(year + "-" + month + "-" + day + " " + hour + ":" + minite + ":" + second);            }            catch (WebException)            {                return DateTime.Parse("2011-1-1");            }            catch (Exception)            {                return DateTime.Parse("2011-1-1");            }            finally            {                if (wrp != null)                    wrp.Close();                if (wrt != null)                    wrt.Abort();            }            return dt;        }    }

获取网络时间，返回一个DateTime对象，然后传给设置系统时间的方法，修改系统时间。

同步系统时间：

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.IO;using System.Net;using System.Net.Sockets;using System.Text.RegularExpressions;using System.Runtime.InteropServices;using System.Runtime;        /// <summary>    /// 更新系统时间    /// </summary>    public class UpdateTime    {        //设置系统时间的API函数        [DllImport("kernel32.dll")]        private static extern bool SetLocalTime(ref SYSTEMTIME time);        [StructLayout(LayoutKind.Sequential)]        private struct SYSTEMTIME        {            public short year;            public short month;            public short dayOfWeek;            public short day;            public short hour;            public short minute;            public short second;            public short milliseconds;        }        /// <summary>        /// 设置系统时间        /// </summary>        /// <param name="dt">需要设置的时间</param>        /// <returns>返回系统时间设置状态，true为成功，false为失败</returns>        public static bool SetDate(DateTime dt)        {            SYSTEMTIME st;            st.year = (short)dt.Year;            st.month = (short)dt.Month;            st.dayOfWeek = (short)dt.DayOfWeek;            st.day = (short)dt.Day;            st.hour = (short)dt.Hour;            st.minute = (short)dt.Minute;            st.second = (short)dt.Second;            st.milliseconds = (short)dt.Millisecond;            bool rt = SetLocalTime(ref st);            return rt;        }    }

两个方法分别写在了两个类里面，只需要在客户端实例化两个对象，然后依次调用其方法即可，简单实用。