49 lines
1.7 KiB
C#
49 lines
1.7 KiB
C#
using System;
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using System.Globalization;
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using System.IO;
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using System.Net;
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namespace ShrlAlgoStudio
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{
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internal static class TimeHelper
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{
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public static DateTime GetTrustedTime()
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{
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// 1. 尝试网络时间 (3秒超时)
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try
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{
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var request = WebRequest.Create("http://www.baidu.com"); // 或 microsoft.com
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request.Method = "HEAD";
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request.Timeout = 3000;
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using (var response = request.GetResponse())
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{
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string dateStr = response.Headers["Date"];
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if (DateTime.TryParseExact(dateStr, "ddd, dd MMM yyyy HH:mm:ss 'GMT'",
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CultureInfo.InvariantCulture, DateTimeStyles.AssumeUniversal, out DateTime netTime))
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return netTime.ToLocalTime();
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}
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}
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catch { }
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// 2. 尝试文件系统痕迹校验 (防断网改时间)
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DateTime localNow = DateTime.Now;
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try
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{
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// 获取系统目录和临时目录的最后修改时间
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DateTime t1 = new DirectoryInfo(Environment.SystemDirectory).LastWriteTime;
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DateTime t2 = new DirectoryInfo(Path.GetTempPath()).LastWriteTime;
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DateTime latestFileTime = t1 > t2 ? t1 : t2;
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// 如果本地时间比系统文件时间还要早超过24小时，判定为作弊
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if (localNow < latestFileTime.AddHours(-24))
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{
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return latestFileTime; // 强制使用文件时间
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}
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}
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catch { }
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// 3. 兜底
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return localNow;
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}
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}
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} |