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CloudBuilder/CloudBuilder.Core/Utility/FileLog.cs

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+using Microsoft.Extensions.Configuration;
+using System;
+using System.IO;
+using System.Text;
+
+/// <summary>
+/// 文件日志写入封装类，自动按日期分文件、超大小自动切割
+/// </summary>
+public class FileLog
+{
+    private readonly IConfiguration _configuration;
+    private readonly object _lockObj = new object(); // 独立锁，不依赖外部this
+
+    public FileLog(IConfiguration configuration)
+    {
+        _configuration = configuration ?? throw new ArgumentNullException(nameof(configuration));
+    }
+
+    /// <summary>
+    /// 写入日志内容到文件
+    /// </summary>
+    /// <param name="log">日志文本</param>
+    public void WriteToFile(string log)
+    {
+        try
+        {
+            // 读取配置，转换最大文件字节数
+            int maxMb = _configuration.GetValue<int>("Logging:MaxFileSizeMB");
+            long maxFileSizeBytes = (long)maxMb * 1024 * 1024;
+
+            string today = DateTime.Now.ToString("yyyyMMdd");
+            string basePath = _configuration["Logging:LogFileDirectory"];
+            Directory.CreateDirectory(basePath);
+
+            string baseFileName = $"log-{today}";
+            string ext = ".log";
+            string finalPath = Path.Combine(basePath, $"{baseFileName}{ext}");
+            int index = 1;
+
+            // 文件超限则递增后缀切割
+            while (File.Exists(finalPath) && new FileInfo(finalPath).Length >= maxFileSizeBytes)
+            {
+                finalPath = Path.Combine(basePath, $"{baseFileName}-{index}{ext}");
+                index++;
+            }
+
+            // 线程安全写入
+            lock (_lockObj)
+            {
+                File.AppendAllText(finalPath, log + Environment.NewLine, Encoding.UTF8);
+            }
+        }
+        catch
+        {
+            // 原逻辑吞掉所有异常，如需日志可自行增加内部异常输出
+        }
+    }
+}