/// <summary>
        /// 日誌部分
        /// </summary>
        /// <param name="fileName"></param>
        /// <param name="type"></param>
        /// <param name="content"></param>
        public static void WriteLogs(string fileName, string type, string content)
        {
            
 
string path = AppDomain.CurrentDomain.BaseDirectory;
            if (!string.IsNullOrEmpty(path))
            {
                path = AppDomain.CurrentDomain.BaseDirectory + fileName;
                if (!Directory.Exists(path))
                {
                    Directory.CreateDirectory(path);
                }
                path 
 
= path + "\\" + DateTime.Now.ToString("yyyyMMdd");
                if (!Directory.Exists(path))
                {
                    Directory.CreateDirectory(path);
                }
                path = path + "\\" + DateTime.Now.ToString("yyyyMMdd") + ".txt";
                if (!File.Exists(path))
                {
                    FileStream fs 
 
= File.Create(path);
                    fs.Close();
                }
                if (File.Exists(path))
                {
                    StreamWriter sw = new StreamWriter(path, true, System.Text.Encoding.Default);
                    sw.WriteLine(DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss.fff") + type + "-->" + content);
                    //  sw.WriteLine("----------------------------------------");
                    sw.Close();
                }
            }
        }

using System;
using System.Collections.Generic;
using System.Text;
using System.Diagnostics;
  
namespace Utils
{
    /// <summary>
    /// <para>　</para>
    /// 　常用工具類——系統日誌類
    /// <para>　---------------------------------------------------</para>
    /// <para>　WriteEventLog：寫入系統日誌(２個方法重載)</para>
    /// <para>　DelEventName：刪除日誌事件源分類</para>
    /// </summary>
    public class EventLogHelper
    {
        #region 寫入系統日誌
        /// <summary>
        /// 寫入系統日誌
        /// </summary>
        /// <param name="EventName">事件源名稱</param>
        /// <param name="LogStr">日誌內容</param>
        public static void WriteEventLog(string EventName, string LogStr)
        {
            try
            {
                if (!EventLog.SourceExists(EventName))
                {
                    EventLog.CreateEventSource(EventName, EventName);
                }
                EventLog.WriteEntry(EventName, LogStr);
            }
            catch (Exception)
            {
            }
        }
        /// <summary>
        /// 寫入系統日誌
        /// </summary>
        /// <param name="EventName">事件源名稱</param>
        /// <param name="LogType">日誌類型</param>
        /// <param name="LogStr">日誌內容</param>
        public static void WriteEventLog(string EventName, string LogStr, EventLogEntryType LogType)
        {
            try
            {
                if (!EventLog.SourceExists(EventName))
                {
                    EventLog.CreateEventSource(EventName, EventName);
                }
                EventLog.WriteEntry(EventName, LogStr, LogType);
            }
            catch (Exception)
            {
            }
        }
        #endregion
  
        #region 刪除日誌事件源分類
        /// <summary>
        /// 刪除日誌事件源分類
        /// </summary>
        /// <param name="EventName">事件源名</param>
        /// <returns></returns>
        public static bool DelEventName(string EventName)
        {
            bool flag = false;
            try
            {
                if (EventLog.SourceExists(EventName))
                {
                    EventLog.DeleteEventSource(EventName,".");
                    flag = true;
                }
            }
            catch (Exception)
            {
            }
            return flag;
        }
        #endregion
    }
}

C# 記錄日誌