diff --git a/OrderSupportTicket/Services/EventSourceTicketRealtimeService.cs b/OrderSupportTicket/Services/EventSourceTicketRealtimeService.cs
index 26c8765..93c960a 100644
--- a/OrderSupportTicket/Services/EventSourceTicketRealtimeService.cs
+++ b/OrderSupportTicket/Services/EventSourceTicketRealtimeService.cs
@@ -6,6 +6,7 @@ using OrderSupportTicket.Models.Api;
 using System;
 using System.Linq;
 using System.Threading.Tasks;
+using WxOrder.Framework.Helpers;
 
 namespace OrderSupportTicket.Services;
 
@@ -76,6 +77,7 @@ public sealed class EventSourceTicketRealtimeService
 	{
 		try
 		{
+			NLogger.Instance.Info("工单服务连接成");
 			await source.StartAsync();
 			lock (_sync)
 			{
@@ -86,7 +88,7 @@ public sealed class EventSourceTicketRealtimeService
 		}
 		catch (Exception ex)
 		{
-			LogSave.Add("工单服务连接失败:" + ex.Message);
+			NLogger.Instance.Error("工单服务连接失败:" + ex.Message);
 			lock (_sync)
 			{
 				if (!_running || !ReferenceEquals(_eventSource, source))
diff --git a/WxOrder.Framework/Helpers/NLogger.cs b/WxOrder.Framework/Helpers/NLogger.cs
new file mode 100644
index 0000000..b26ea2e
--- /dev/null
+++ b/WxOrder.Framework/Helpers/NLogger.cs
@@ -0,0 +1,275 @@
+using System;
+using System.IO;
+using System.Text;
+
+namespace WxOrder.Framework.Helpers
+{
+	/// <summary> 日志消息级别。 </summary>
+	public enum LogMessageLevel
+	{
+		Trace = 0,
+		Debug = 1,
+		Info = 2,
+		Warn = 3,
+		Error = 4,
+		Fatal = 5,
+		None = 6
+	}
+
+	/// <summary>
+	/// 调试输出桥接。默认输出到 System.Diagnostics.Debug，
+	/// 可在外部重新赋值 DebugPrint 以接管控件台/UI 输出。
+	/// </summary>
+	public static class DebugLog
+	{
+		/// <summary> 调试输出回调。默认写到 Debug 输出窗口。 </summary>
+		public static Action<string>? DebugPrint { get; set; }
+			= msg => System.Diagnostics.Debug.WriteLine(msg);
+	}
+
+	/// <summary>
+	/// 默认日志逻辑类（不依赖任何第三方日志库）。
+	/// 日志文件按日期分目录存放，并在跨天时自动切换：
+	/// {logDirectory}/yyyy-MM/yyyy-MM-dd.log，例如 log/2022-12/2022-12-12.log
+	/// </summary>
+	public sealed class NLogger : IDisposable
+	{
+		private const string DefaultName = "Default";
+
+		private static readonly object _lock = new object();
+		private static NLogger? _instance;
+
+		/// <summary>
+		/// 同一进程内所有实例共用的写入锁。
+		/// 多个实例（不同 Name）会写入同一个按日期命名的文件，需要串行化写入。
+		/// </summary>
+		private static readonly object _fileLock = new object();
+
+		/// <summary> 获取 NLogger 的唯一单例实例（线程安全）。 </summary>
+		public static NLogger Instance
+		{
+			get
+			{
+				if (_instance == null)
+				{
+					lock (_lock)
+					{
+						if (_instance == null)
+							_instance = new NLogger(DefaultName);
+					}
+				}
+				return _instance;
+			}
+		}
+
+		/// <summary> 静态工厂：根据名称创建日志实例。 </summary>
+		public static NLogger Create(string name, string? logDirectory = null)
+		{
+			if (string.IsNullOrWhiteSpace(name))
+				throw new ArgumentException("日志名称不能为空。", nameof(name));
+
+			return new NLogger(name, logDirectory);
+		}
+
+		/// <summary> 静态工厂：创建使用默认名称的日志实例。 </summary>
+		public static NLogger Create() => new NLogger(DefaultName);
+
+		/// <summary> 日志名称（写入每行日志中，用于区分来源，不再决定文件名）。 </summary>
+		public string Name { get; }
+
+		public bool IsDebugEnabled { get; set; } = true;
+
+		public bool IsDebugWriteLineEnabled { get; set; } = true;
+
+		public LogMessageLevel MinimumLevel { get; set; } = LogMessageLevel.Trace;
+
+		/// <summary> 日志根目录。 </summary>
+		public string LogDirectory { get; }
+
+		private string? _currentFilePath;
+		private StreamWriter? _writer;
+		private bool _disposed;
+
+		private NLogger(string name, string? logDirectory = null)
+		{
+			Name = name;
+			LogDirectory = logDirectory ?? Path.Combine(AppContext.BaseDirectory, "log");
+			// 文件在第一次写入时按当前日期惰性创建，构造阶段不打开文件。
+		}
+
+		#region 日志方法
+
+		public void Trace(string message, Exception? exception = null)
+			=> Execute(LogMessageLevel.Trace, message, exception);
+
+		public void Debug(string message, Exception? exception = null)
+			=> Execute(LogMessageLevel.Debug, message, exception);
+
+		public void Info(string message, Exception? exception = null)
+			=> Execute(LogMessageLevel.Info, message, exception);
+
+		public void Warn(string message, Exception? exception = null)
+			=> Execute(LogMessageLevel.Warn, message, exception);
+
+		public void Error(string message, Exception? exception = null)
+			=> Execute(LogMessageLevel.Error, message, exception);
+
+		public void Fatal(string message, Exception? exception = null)
+			=> Execute(LogMessageLevel.Fatal, message, exception);
+
+		public void Log(string message, LogMessageLevel level, Exception? exception = null)
+			=> Execute(level, message, exception);
+
+		#endregion
+
+		#region 内部逻辑
+
+		private bool CheckEnabled(LogMessageLevel level)
+		{
+			if (level == LogMessageLevel.None)
+				return false;
+
+			if (level < MinimumLevel)
+				return false;
+
+			if (level == LogMessageLevel.Trace || level == LogMessageLevel.Debug)
+				return IsDebugEnabled;
+
+			return true;
+		}
+
+		private void Execute(LogMessageLevel level, string message, Exception? exception)
+		{
+			if (CheckEnabled(level))
+			{
+				WriteToFile(level, message, exception);
+			}
+
+			if (IsDebugWriteLineEnabled)
+			{
+				string logOutput = "[" + level + "] " + message;
+				if (exception != null)
+				{
+					logOutput += Environment.NewLine + exception;
+				}
+
+				Action<string>? handler = DebugLog.DebugPrint;
+				if (handler != null)
+				{
+					handler(logOutput);
+				}
+			}
+		}
+
+		/// <summary> 根据日期生成日志文件路径：{根目录}/yyyy-MM/yyyy-MM-dd.log </summary>
+		private string GetLogFilePath(DateTime time)
+		{
+			return Path.Combine(
+				LogDirectory,
+				time.ToString("yyyy-MM"),
+				time.ToString("yyyy-MM-dd") + ".log");
+		}
+
+		/// <summary> 写入当天的日志文件，跨天时自动切换到新文件。 </summary>
+		private void WriteToFile(LogMessageLevel level, string message, Exception? exception)
+		{
+			DateTime now = DateTime.Now;
+
+			var sb = new StringBuilder();
+			sb.Append('[')
+			  .Append(now.ToString("yyyy-MM-dd HH:mm:ss.fff"))
+			  .Append("] [")
+			  .Append(level)
+			  .Append("] [")
+			  .Append(Name)
+			  .Append("] ")
+			  .AppendLine(message);
+
+			if (exception != null)
+			{
+				sb.AppendLine(exception.ToString());
+			}
+
+			string line = sb.ToString();
+
+			lock (_fileLock)
+			{
+				if (_disposed) return;
+
+				try
+				{
+					EnsureWriter(GetLogFilePath(now));
+					_writer!.Write(line);
+					_writer.Flush();
+				}
+				catch
+				{
+					// 日志写入失败不应影响主流程，这里吞掉异常。
+					// 重置写入器，下次写入时重新尝试打开文件。
+					CloseWriter();
+				}
+			}
+		}
+
+		/// <summary> 确保写入器指向指定路径；路径变化（跨天/跨月）时关闭旧文件并打开新文件。 </summary>
+		private void EnsureWriter(string path)
+		{
+			if (_writer != null && string.Equals(_currentFilePath, path, StringComparison.Ordinal))
+				return;
+
+			CloseWriter();
+
+			string? dir = Path.GetDirectoryName(path);
+			if (!string.IsNullOrEmpty(dir))
+			{
+				Directory.CreateDirectory(dir);
+			}
+
+			var fs = new FileStream(
+				path,
+				FileMode.Append,
+				FileAccess.Write,
+				FileShare.ReadWrite);
+
+			_writer = new StreamWriter(fs, new UTF8Encoding(false))
+			{
+				AutoFlush = false
+			};
+			_currentFilePath = path;
+		}
+
+		private void CloseWriter()
+		{
+			try
+			{
+				if (_writer != null)
+				{
+					_writer.Flush();
+					_writer.Dispose();
+				}
+			}
+			catch { /* ignore */ }
+			finally
+			{
+				_writer = null;
+				_currentFilePath = null;
+			}
+		}
+
+		#endregion
+
+		#region IDisposable
+
+		public void Dispose()
+		{
+			lock (_fileLock)
+			{
+				if (_disposed) return;
+				_disposed = true;
+				CloseWriter();
+			}
+		}
+
+		#endregion
+	}
+}
\ No newline at end of file