如何使用C#修改本地Windows系统时间
时间：2021-05-13 08:13:24|栏目：.NET代码|点击： 次
C#提升管理员权限修改本地Windows系统时间
在桌面应用程序开发过程中，需要对C盘下进行文件操作或者系统参数进行设置，例如在没有外网的情况下局域网内部自己的机制进行时间同步校准，这是没有管理员权限便无法进行设置。
1. 首先需要获得校准时间，两种方式：
通过可上网的电脑进行外部获取当前时间。
通过NTP实现
//NTP消息大小摘要是16字节 (RFC 2030) byte[] ntpData = new byte[48]; //设置跳跃指示器、版本号和模式值 // LI = 0 (no warning), VN = 3 (IPv4 only), Mode = 3 (Client Mode) ntpData[0] = 0x1B; IPAddress ip = iPAddress; // NTP服务给UDP分配的端口号是123 IPEndPoint ipEndPoint = new IPEndPoint(ip, 123); // 使用UTP进行通讯 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();
程序手动输入。
2. 转换为本地时间
//传输时间戳字段偏移量，以64位时间戳格式，应答离开客户端服务器的时间 const byte serverReplyTime = 40; // 获得秒的部分 ulong intPart = BitConverter.ToUInt32(ntpData, serverReplyTime); //获取秒的部分 ulong fractPart = BitConverter.ToUInt32(ntpData, serverReplyTime + 4); //由big-endian 到 little-endian的转换 intPart = swapEndian(intPart); fractPart = swapEndian(fractPart); ulong milliseconds = (intPart * 1000) + ((fractPart * 1000) / 0x100000000UL); // UTC时间 DateTime webTime = (new DateTime(1900, 1, 1, 0, 0, 0, DateTimeKind.Utc)).AddMilliseconds(milliseconds); //本地时间 DateTime dt = webTime.ToLocalTime();
3. 获取当前是否是管理员
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);
//转化后的时间进行本地设置，并返回成功与否
bool isSuccess = SetLocalDateTime(dt);
5. 提升权限
如果程序不是管理员身份运行则不可以设置时间
引入引用程序清单文件（app.manifest），步骤：添加新建项->选择‘应用程序清单文件（仅限windows）'
引入后再文件中出现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 |
默认权限：
<requestedExecutionLevel level="asInvoker " uiAccess="false" />
asInvoker 表示当前用户本应该具有的权限
highestAvailable 表示提升当前用户最高权限
requireAdministrator 表示提升为管理员权限
修改权限：
<requestedExecutionLevel level="requireAdministrator" uiAccess="false" />
6. 重新生成程序
源码
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>
/// 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>
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字节 (RFC 2030)
byte[] ntpData = new byte[48];
//设置跳跃指示器、版本号和模式值
// LI = 0 (no warning), VN = 3 (IPv4 only), Mode = 3 (Client Mode)
ntpData[0] = 0x1B;
IPAddress ip = iPAddress;
// NTP服务给UDP分配的端口号是123
IPEndPoint ipEndPoint = new IPEndPoint(ip, 123);
// 使用UTP进行通讯
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;
//传输时间戳字段偏移量，以64位时间戳格式，应答离开客户端服务器的时间
const byte serverReplyTime = 40;
// 获得秒的部分
ulong intPart = BitConverter.ToUInt32(ntpData, serverReplyTime);
//获取秒的部分
ulong fractPart = BitConverter.ToUInt32(ntpData, serverReplyTime + 4);
//由big-endian 到 little-endian的转换
intPart = swapEndian(intPart);
fractPart = swapEndian(fractPart);
ulong milliseconds = (intPart * 1000) + ((fractPart * 1000) / 0x100000000UL);
// UTC时间
DateTime webTime = (new DateTime(1900, 1, 1, 0, 0, 0, DateTimeKind.Utc)).AddMilliseconds(milliseconds);
//本地时间
DateTime dt = webTime.ToLocalTime();
bool isSuccess = SetLocalDateTime(dt);
syncDateTime = dt;
}
catch (Exception ex)
{
message = ex.Message;
return false;
}
return true;
}
}
}
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