using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Diagnostics;namespace ConsoleApp{ /// <summary> /// 系統日志 /// </summary> public class PackSystemEventLog {  /// <summary>  /// 錯誤信息  /// </summary>  private static string ErrorInfo { get; set; }  /// <summary>  /// 創建系統事件日志分類  /// </summary>  /// <param name="eventSourceName">注冊事件源(比如說這個日志來源于某一個應用程序)</param>  /// <param name="logName">日志名稱(事件列表顯示的名稱)</param>  /// <returns></returns>  public static bool CreateSystemEventLogCategory(string eventSourceName, string logName)  {   bool createResult = false;   try   {    if (!EventLog.SourceExists(eventSourceName))    {     EventLog.CreateEventSource(eventSourceName, logName);    }    createResult = true;   }   catch (Exception ex)   {    createResult = false;    ErrorInfo = ex.Message;   }   return createResult;  }  /// <summary>  /// 刪除系統事件日志分類  /// </summary>  /// <param name="eventSource">EventName事件源</param>  /// <returns></returns>  public static bool RemoveSystemEventSourceCategory(string eventSource)  {   bool createResult = false;   try   {    if (EventLog.SourceExists(eventSource))    {     EventLog.DeleteEventSource(eventSource, ".");    }    createResult = true;   }   catch (Exception ex)   {    createResult = false;    ErrorInfo = ex.Message;   }   return createResult;  }  /// <summary>  /// 向系統日志中寫入日志  /// </summary>  /// <param name="eventSource">事件源</param>  /// <param name="msg">寫入日志信息</param>  /// <param name="type">日志文本分類(警告、信息、錯誤)</param>  /// <returns></returns>  public static bool WriteSystemEventLog(string eventSource, string msg, EventLogEntryType type)  {   bool writeResult = false;   try   {    if (!EventLog.SourceExists(eventSource))    {     writeResult = false;     ErrorInfo = "日志分類不存在!";         }    else    {     EventLog.WriteEntry(eventSource, msg, type);     writeResult = true;    }   }   catch (Exception ex)   {    writeResult = false;    ErrorInfo = ex.Message;   }   return writeResult;  }  /// <summary>  /// 刪除事件源中logName(好像刪除了所有的該分類的日志)  /// </summary>  /// <param name="eventSource"></param>  /// <param name="logName"></param>  /// <returns></returns>  public static bool RemoveSystemEventLog(string eventSource, string logName)  {   bool removeResult = false;   try   {    if (!EventLog.SourceExists(eventSource))    {     removeResult = false;     ErrorInfo = "日志分類不存在!";    }    else    {     EventLog.Delete(logName);     removeResult = true;    }   }   catch (Exception ex)   {    removeResult = false;    ErrorInfo = ex.Message;   }   return removeResult;  }  /// <summary>  /// 獲取錯誤信息  /// </summary>  /// <returns></returns>  public static string GetErrorMessage()  {   return ErrorInfo;  } }}