C# 同步更新系统时间
作者：互联网
前言
在定位用户问题时，发现有些电脑，会出现系统时间不是最新的问题。
可能原因：
- 取消了勾选服务器时间同步
- 当前安装的系统，是一个未知来源系统，导致系统时间更新失败
而系统时间不正确，会导致IE选项-证书，校验不通过~
更新系统时间
1. 连接时间服务器
时间服务器列表（推荐）： string[] timeHosts = { "time.windows.com", "time.nist.gov" };
1 /// <summary>
2 /// 连接时间服务器
3 /// </summary>
4 /// <param name="socket">服务器接口</param>
5 /// <param name="startTime">开始时间</param>
6 /// <param name="errorMsg">错误信息</param>
7 /// <returns></returns>
8 private static bool TryConnectToTimeServer(out Socket socket, out DateTime startTime, out string errorMsg)
9 {
10 socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);//创建Socket
11 socket.ReceiveTimeout = 10 * 1000;//设置超时时间
12 errorMsg = string.Empty;
13 startTime = DateTime.Now;
14
15 // 遍历时间服务器列表
16 foreach (string strHost in timeHosts)
17 {
18 try
19 {
20 // 记录开始的时间
21 startTime = DateTime.Now;
22
23 var iphostinfo = Dns.GetHostEntry(strHost);
24 var ip = iphostinfo.AddressList[0];
25 //建立IPAddress对象与端口，创建IPEndPoint节点:
26 int port = 13;
27 var ipe = new IPEndPoint(ip, port);
28 //连接到服务器
29 socket.Connect(ipe);
30 // 如果连接到服务器就跳出
31 if (socket.Connected) break;
32 }
33 catch (Exception ex)
34 {
35 errorMsg = $"时间服务器连接失败！/r错误信息：{ex.Message}系统提示";
36 }
37 }
38 return socket.Connected;
39 }
2. 从服务器接收数据
1 /// <summary>
2 /// 从服务器接收数据
3 /// </summary>
4 /// <param name="socket"></param>
5 /// <returns></returns>
6 private static StringBuilder ReceiveMessageFromServer(Socket socket)
7 {
8 //SOCKET同步接受数据
9 byte[] receiveBytes = new byte[1024];
10 int nBytes, nTotalBytes = 0;
11 StringBuilder sb = new StringBuilder();
12 System.Text.Encoding encoding = Encoding.UTF8;
13
14 while ((nBytes = socket.Receive(receiveBytes, 0, 1024, SocketFlags.None)) > 0)
15 {
16 nTotalBytes += nBytes;
17 sb.Append(encoding.GetString(receiveBytes, 0, nBytes));
18 }
19
20 return sb;
21 }
3. 更新本地时间
1 /// <summary>
2 /// 更新系统时间
3 /// </summary>
4 /// <returns>更新结果</returns>
5 public static string UpdateSystemTime()
6 {
7 try
8 {
9 var connected = TryConnectToTimeServer(out Socket socket, out var startTime, out string errorMsg);
10 if (connected)
11 {
12 var receivedMsg = ReceiveMessageFromServer(socket);
13 socket.Close();
14 //切割字符串
15 string[] receiveMsgList = receivedMsg.ToString().Split(' ');
16 if (receiveMsgList.Length >= 3)
17 {
18 var dateTimeValue = receiveMsgList[1] + " " + receiveMsgList[2];
19 SetLocalTime(startTime, dateTimeValue);
20 }
21 }
22 else
23 {
24 return errorMsg;
25 }
26 }
27 catch (Exception e)
28 {
29 return $"函数{nameof(UpdateSystemTime)}执行异常，{e.Message}";
30 }
31 return "时间已同步";
32 }
33 /// <summary>
34 /// 设置系统时间
35 /// </summary>
36 /// <param name="startTime">请求服务器时的开始时间</param>
37 /// <param name="dateTimeValue">服务器返回的时间</param>
38 private static void SetLocalTime(DateTime startTime, string dateTimeValue)
39 {
40 // 得到开始到现在所消耗的时间
41 TimeSpan k = DateTime.Now - startTime;
42 // 减去中途消耗的时间
43 DateTime updatedUtcTime = Convert.ToDateTime(dateTimeValue).Subtract(-k);
44
45 //处置北京时间 +8时
46 var updatedTime = updatedUtcTime.AddHours(8);
47
48 //转换System.DateTime到SystemTime
49 SystemTime systemTime = new SystemTime();
50 systemTime.FromDateTime(updatedTime);
51
52 //调用Win32 API设置系统时间
53 Win32API.SetLocalTime(ref systemTime);
54 }
系统时间辅助类 & Win32API ：
1 /// <summary>
2 /// 系统时间帮助类
3 /// </summary>
4 public struct SystemTime
5 {
6 public ushort wYear;
7 public ushort wMonth;
8 public ushort wDayOfWeek;
9 public ushort wDay;
10 public ushort wHour;
11 public ushort wMinute;
12 public ushort wSecond;
13 public ushort wMilliseconds;
14
15 /// <summary>
16 /// 从System.DateTime转换。
17 /// </summary>
18 /// <param name="time">System.DateTime类型的时间。</param>
19 public void FromDateTime(DateTime time)
20 {
21 wYear = (ushort)time.Year;
22 wMonth = (ushort)time.Month;
23 wDayOfWeek = (ushort)time.DayOfWeek;
24 wDay = (ushort)time.Day;
25 wHour = (ushort)time.Hour;
26 wMinute = (ushort)time.Minute;
27 wSecond = (ushort)time.Second;
28 wMilliseconds = (ushort)time.Millisecond;
29 }
30 /// <summary>
31 /// 转换为System.DateTime类型。
32 /// </summary>
33 /// <returns></returns>
34 public DateTime ToDateTime()
35 {
36 return new DateTime(wYear, wMonth, wDay, wHour, wMinute, wSecond, wMilliseconds);
37 }
38 /// <summary>
39 /// 静态方法。转换为System.DateTime类型。
40 /// </summary>
41 /// <param name="time">SYSTEMTIME类型的时间。</param>
42 /// <returns></returns>
43 public static DateTime ToDateTime(SystemTime time)
44 {
45 return time.ToDateTime();
46 }
47 }
48
49 /// <summary>
50 /// 系统更新时间DLL
51 /// </summary>
52 public class Win32API
53 {
54 [DllImport("Kernel32.dll")]
55 public static extern bool SetLocalTime(ref SystemTime Time);
56 [DllImport("Kernel32.dll")]
57 public static extern void GetLocalTime(ref SystemTime Time);
58 }
View Code
标签：同步,socket,C#,ushort,更新,DateTime,时间,time,public 来源： https://www.cnblogs.com/kybs0/p/10953934.html