C#同步網絡時間和本地時間

客戶的機器的系統時間經常出錯，導致給他們做的軟件無法正常使用，所以后來就加了一個同步網絡時間的小功能。實現起來很簡單，但是卻很使用。這個小功能就是先獲取網絡時間，然后將系統的時間修改成從網絡獲得的時間。下面是具體的實現：

獲取網絡時間： 

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>  
    /// 獲取標準北京時間，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;

    }
}



</pre> 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。

 同步系統時間：
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;
    }
}



</pre> 

 兩個方法分別寫在了兩個類里面，只需要在客戶端實例化兩個對象，然后依次調用其方法即可，簡單實用。