C#获取网络时间并更新

using System;
using System.Net;
using System.Net.Sockets;
using System.Runtime.InteropServices;
using System.Text;
using System.Windows.Threading;

namespace 获取网络时间
{
    /// <summary>
    /// 使用time.nist.gov可靠性好
    /// 
    /// </summary>
    public class DateTimeHelper
    {
        [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 SetLocalDateTime(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;
        }


        public static DateTime GetDateTime(long timeStamp)
        {
            return new DateTime(1970, 1, 1).AddSeconds(timeStamp).ToLocalTime();
        }

        public static bool GetInternetTime(string url, out DateTime dt, out string errMsg)
        {
            dt = DateTime.MinValue;
            var startDt = DateTime.Now;
            var port = 13;
            var socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp) { ReceiveTimeout = 2000 };
            try
            {
                var iphostinfo = Dns.GetHostEntry(url);
                var ip = iphostinfo.AddressList[0];
                var ipe = new IPEndPoint(ip, port);

                var iar = socket.BeginConnect(ipe, null, null);
                if (!iar.AsyncWaitHandle.WaitOne(5000))
                {
                    errMsg = "连接超时" + url;
                    return false;
                }
                var recvBuffer = new byte[1024];
                var sb = new StringBuilder();
                var myE = Encoding.UTF8;

                int nBytes;
                while ((nBytes = socket.Receive(recvBuffer, 0, 1024, SocketFlags.None)) > 0)
                {
                    sb.Append(myE.GetString(recvBuffer, 0, nBytes));
                }
                var o = sb.ToString().Split(' ');


                TimeSpan ts = DateTime.Now - startDt;

                var setDt = Convert.ToDateTime(o[1] + " " + o[2]).Subtract(-ts); // 减去中途消耗的时间


                dt = setDt.ToLocalTime();
                Console.WriteLine(@"服务器：{0}时间：{1}", url, setDt);
                errMsg = "";
                return true;
            }
            catch (Exception ex)
            {

                errMsg = ex.Message;
                return false;
            }
            finally
            {
                socket.Close();
            }
        }

        /// <summary>
        /// 调用示例
        /// </summary>
        private static void ExamTest()
        {
            var ok = false;
            var errMsg = "";
            var dt = DateTime.MinValue;
            var url = "time.nist.gov";
            Action a = delegate
            {
                if (string.IsNullOrEmpty(url)) return;

                ok = DateTimeHelper.GetInternetTime(url, out dt, out errMsg);
            };
            a.BeginInvoke(_ =>
            {
                Action b = delegate
                {
                    if (ok)
                    {
                        var success = DateTimeHelper.SetLocalDateTime(dt);
                        if (success)
                        {
                            string infoTxt = "更新时间成功:" + dt;
                        }
                    }
                    else
                    {
                        string errInfo = "更新出错：" + errMsg;
                    }
                };
            }, null);
        }
    }
}

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private void SetTimeBtn_Click(object sender, RoutedEventArgs e) {     SettimeBtn.IsEnabled = false;     var ok = false;     var errMsg = "";     var dt = DateTime.MinValue;     var url = SvrCombox.Text;     Action a = delegate     {         if (string.IsNullOrEmpty(url)) return;           ok = DateTimeHelper.GetInternetTime(url, out dt, out errMsg);     };     a.BeginInvoke(_ =>     {         Dispatcher.Invoke(() =>         {             SettimeBtn.IsEnabled = true;             if (ok)             {                 var success = DateTimeHelper.SetLocalDateTime(dt);                 if (success)                 {                     InfoText.Text = "更新时间成功:" + dt;                 }             }             else             {                 InfoText.Text = "更新出错：" + errMsg;             }         });     }, null); }