C# 實現網絡時間同步功能

 

 

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>  
    /// 網絡時間  
    /// </summary>  
    public class NetTime
    {
       
        /// <summary>  
        /// 獲取標准北京時間，讀取http://www.beijing-time.org/time.asp  
        /// </summary>  
        /// <returns>返回網絡時間</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;

        }
    }

 

獲取網絡時間，返回一個DateTime對象，然后傳給設置系統時間的方法，修改系統時間。下面是設置系統時間的代碼：

 

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>
    /// 更新系統時間
    /// </summary>
    public class UpdateTime
    {
        //設置系統時間的API函數
        [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>
        /// 設置系統時間
        /// </summary>
        /// <param name="dt">需要設置的時間</param>
        /// <returns>返回系統時間設置狀態，true為成功，false為失敗</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;
        }
    }

需要注意的時，在win8系統上需要以管理員身份來運行程序，否則是無法設置系統時間的。下面這段代碼可以設置讓程序默認以管理員身份運行：

 

static void Main(string[] Args)
        {
            /**
             * 當前用戶是管理員的時候，直接啟動應用程序
             * 如果不是管理員，則使用啟動對象啟動程序，以確保使用管理員身份運行
             */
            //獲得當前登錄的Windows用戶標示
            System.Security.Principal.WindowsIdentity identity = System.Security.Principal.WindowsIdentity.GetCurrent();
            //創建Windows用戶主題
            Application.EnableVisualStyles();

            System.Security.Principal.WindowsPrincipal principal = new System.Security.Principal.WindowsPrincipal(identity);
            //判斷當前登錄用戶是否為管理員
            if (principal.IsInRole(System.Security.Principal.WindowsBuiltInRole.Administrator))
            {
                //如果是管理員，則直接運行

                Application.EnableVisualStyles();
                Application.Run(new Form1());
            }
            else
            {
                //創建啟動對象
                System.Diagnostics.ProcessStartInfo startInfo = new System.Diagnostics.ProcessStartInfo();
                //設置運行文件
                startInfo.FileName = System.Windows.Forms.Application.ExecutablePath;
                //設置啟動參數
                startInfo.Arguments = String.Join(" ", Args);
                //設置啟動動作,確保以管理員身份運行
                startInfo.Verb = "runas";
                //如果不是管理員，則啟動UAC
                System.Diagnostics.Process.Start(startInfo);
                //退出
                System.Windows.Forms.Application.Exit();
            }
        }

 

搞定！