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如何使用C#修改本地Windows系統(tǒng)時(shí)間

更新時(shí)間：2021年01月25日 08:56:16 作者：MarkYUN

這篇文章主要介紹了如何使用C#修改本地Windows系統(tǒng)時(shí)間，幫助大家更好的理解和使用c#，感興趣的朋友可以了解下

C#提升管理員權(quán)限修改本地Windows系統(tǒng)時(shí)間

在桌面應(yīng)用程序開發(fā)過程中，需要對C盤下進(jìn)行文件操作或者系統(tǒng)參數(shù)進(jìn)行設(shè)置，例如在沒有外網(wǎng)的情況下局域網(wǎng)內(nèi)部自己的機(jī)制進(jìn)行時(shí)間同步校準(zhǔn)，這是沒有管理員權(quán)限便無法進(jìn)行設(shè)置。

1. 首先需要獲得校準(zhǔn)時(shí)間，兩種方式：

通過可上網(wǎng)的電腦進(jìn)行外部獲取當(dāng)前時(shí)間。

通過NTP實(shí)現(xiàn)

 //NTP消息大小摘要是16字節(jié) (RFC 2030)
 byte[] ntpData = new byte[48];
 //設(shè)置跳躍指示器、版本號和模式值
 // LI = 0 (no warning), VN = 3 (IPv4 only), Mode = 3 (Client Mode)
 ntpData[0] = 0x1B; 
 IPAddress ip = iPAddress;
 // NTP服務(wù)給UDP分配的端口號是123
 IPEndPoint ipEndPoint = new IPEndPoint(ip, 123);
 // 使用UTP進(jìn)行通訊
 Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
 socket.Connect(ipEndPoint);
 socket.ReceiveTimeout = 3000;
 socket.Send(ntpData);
 socket.Receive(ntpData);
 socket?.Close();
 socket?.Dispose();

程序手動輸入。

2. 轉(zhuǎn)換為本地時(shí)間

 //傳輸時(shí)間戳字段偏移量，以64位時(shí)間戳格式，應(yīng)答離開客戶端服務(wù)器的時(shí)間
 const byte serverReplyTime = 40;
 // 獲得秒的部分
 ulong intPart = BitConverter.ToUInt32(ntpData, serverReplyTime);
 //獲取秒的部分
 ulong fractPart = BitConverter.ToUInt32(ntpData, serverReplyTime + 4);
 //由big-endian 到 little-endian的轉(zhuǎn)換
 intPart = swapEndian(intPart);
 fractPart = swapEndian(fractPart);
 ulong milliseconds = (intPart * 1000) + ((fractPart * 1000) / 0x100000000UL);
 // UTC時(shí)間
 DateTime webTime = (new DateTime(1900, 1, 1, 0, 0, 0, DateTimeKind.Utc)).AddMilliseconds(milliseconds);
 //本地時(shí)間
 DateTime dt = webTime.ToLocalTime();

3. 獲取當(dāng)前是否是管理員

public static bool IsAdministrator()
    {
      WindowsIdentity identity = WindowsIdentity.GetCurrent();
      WindowsPrincipal principal = new WindowsPrincipal(identity);
      return principal.IsInRole(WindowsBuiltInRole.Administrator);
    }

4. 引入dll

[DllImport("kernel32.dll")]
private static extern bool SetLocalTime(ref Systemtime time);

//轉(zhuǎn)化后的時(shí)間進(jìn)行本地設(shè)置，并返回成功與否
bool isSuccess = SetLocalDateTime(dt);

5. 提升權(quán)限

如果程序不是管理員身份運(yùn)行則不可以設(shè)置時(shí)間

引入引用程序清單文件（app.manifest），步驟：添加新建項(xiàng)->選擇‘應(yīng)用程序清單文件（僅限windows）'

引入后再文件中出現(xiàn)app.manifest文件

Value	Description	Comment
asInvoker	The application runs with the same access token as the parent process.	Recommended for standard user applications. Do refractoring with internal elevation points, as per the guidance provided earlier in this document.
highestAvailable	The application runs with the highest privileges the current user can obtain.	Recommended for mixed-mode applications. Plan to refractor the application in a future release.
requireAdministrator	The application runs only for administrators and requires that the application be launched with the full access token of an administrator.	Recommended for administrator only applications. Internal elevation points

默認(rèn)權(quán)限：

 <requestedExecutionLevel level="asInvoker " uiAccess="false" />

asInvoker 表示當(dāng)前用戶本應(yīng)該具有的權(quán)限

highestAvailable 表示提升當(dāng)前用戶最高權(quán)限

requireAdministrator 表示提升為管理員權(quán)限

修改權(quán)限：

 <requestedExecutionLevel level="requireAdministrator" uiAccess="false" />

6. 重新生成程序

源碼

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Sockets;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;

namespace WindowsFormsApp1
{

  public class DateTimeSynchronization
  {
    [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;
    }

    [DllImport("kernel32.dll")]
    private static extern bool SetLocalTime(ref Systemtime time);

    private static uint swapEndian(ulong x)
    {
      return (uint)(((x & 0x000000ff) << 24) +
      ((x & 0x0000ff00) << 8) +
      ((x & 0x00ff0000) >> 8) +
      ((x & 0xff000000) >> 24));
    }

    /// <summary>
    /// 設(shè)置系統(tǒng)時(shí)間
    /// </summary>
    /// <param name="dt">需要設(shè)置的時(shí)間</param>
    /// <returns>返回系統(tǒng)時(shí)間設(shè)置狀態(tài)，true為成功，false為失敗</returns>
    private 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;
    }
    private static IPAddress iPAddress = null;
    public static bool Synchronization(string host, out DateTime syncDateTime, out string message)
    {
      syncDateTime = DateTime.Now;
      try
      {
        message = "";
        if (iPAddress == null)
        {
          var iphostinfo = Dns.GetHostEntry(host);
          var ntpServer = iphostinfo.AddressList[0];
          iPAddress = ntpServer;
        }
        DateTime dtStart = DateTime.Now;
        //NTP消息大小摘要是16字節(jié) (RFC 2030)
        byte[] ntpData = new byte[48];
        //設(shè)置跳躍指示器、版本號和模式值
        // LI = 0 (no warning), VN = 3 (IPv4 only), Mode = 3 (Client Mode)
        ntpData[0] = 0x1B; 
        IPAddress ip = iPAddress;
        // NTP服務(wù)給UDP分配的端口號是123
        IPEndPoint ipEndPoint = new IPEndPoint(ip, 123);
        // 使用UTP進(jìn)行通訊
        Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
        socket.Connect(ipEndPoint);
        socket.ReceiveTimeout = 3000;
        socket.Send(ntpData);
        socket.Receive(ntpData);
        socket?.Close();
        socket?.Dispose();
        DateTime dtEnd = DateTime.Now;
        //傳輸時(shí)間戳字段偏移量，以64位時(shí)間戳格式，應(yīng)答離開客戶端服務(wù)器的時(shí)間
        const byte serverReplyTime = 40;
        // 獲得秒的部分
        ulong intPart = BitConverter.ToUInt32(ntpData, serverReplyTime);
        //獲取秒的部分
        ulong fractPart = BitConverter.ToUInt32(ntpData, serverReplyTime + 4);
        //由big-endian 到 little-endian的轉(zhuǎn)換
        intPart = swapEndian(intPart);
        fractPart = swapEndian(fractPart);
        ulong milliseconds = (intPart * 1000) + ((fractPart * 1000) / 0x100000000UL);
        // UTC時(shí)間
        DateTime webTime = (new DateTime(1900, 1, 1, 0, 0, 0, DateTimeKind.Utc)).AddMilliseconds(milliseconds);
        //本地時(shí)間
        DateTime dt = webTime.ToLocalTime();
        bool isSuccess = SetLocalDateTime(dt);
        syncDateTime = dt;

      }
      catch (Exception ex)
      {
        message = ex.Message;
        return false;
      }
      return true;

    }
  }
}

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