using System;
using System.IO;
using System.Text;
public class LogInfo
{
private string ErrorInfo_User = ""; // 記錄用戶自定義錯誤信息
private string ErrorPosition = ""; // 記錄錯誤的位置信息，可包括類、函數等
private string ErrorInfo_Sys = ""; // 記錄系統產生的異常錯誤信息
// 記錄日志信息
public void RecordErrorInfo(string Position, string Error_Sys, string Error_User)
{
ErrorPosition = Position;
ErrorInfo_Sys = Error_Sys;
ErrorInfo_User = Error_User;
}
// 自定義日志信息格式
private string GetLogContent()
{
string LogContent = "/r/n--------------------------------------------------------------------------/r/n";
LogContent += "[自定義異常日志][" + DateTime.Now.ToString() + "]/r/n";
LogContent += "=>[Position]=>[" + ErrorPosition + "]/r/n";
LogContent += "=>[UserInfo]=>[" + ErrorInfo_User + "]/r/n";
LogContent += "=>[SysInfo]=>[" + ErrorInfo_Sys + "]/r/n";
LogContent += "--------------------------------------------------------------------------/r/n";
return LogContent;
}
// 保存日志信息到文件
public void SaveLogToFile()
{
try
{
// get the file path of the log.
string FileName = @"log/LogInfo_" + DateTime.Now.ToString("yyyy-MM-dd") + ".txt";
// get the content of the log.
string LogContent = GetLogContent();
// create the stream of the log file and save the log.
FileStream smLog = new FileStream(FileName, FileMode.Append, FileAccess.Write);
// if the stream is correct.
if (smLog != null)
{
long lFileContentLen = smLog.Length;
smLog.Lock(0, lFileContentLen);
byte[] buffer = Encoding.GetEncoding("gb2312").GetBytes(LogContent);
smLog.Write(buffer, 0, buffer.Length);
smLog.Unlock(0, lFileContentLen);
smLog.Flush();
smLog.Close();
}
}
catch
{ }
}
}
public class LogExample
{
private LogInfo _Log = new LogInfo();
// 某處理函數一
public void Function_First()
    {
try
{
// do something which could be occur exception.
}
catch (Exception error)
{
_Log.RecordErrorInfo("函數Function_First", error.Message.ToString(), "執行函數Function_First時，發生異常！");
_Log.SaveLogToFile();
}
    }
// 某處理函數二
public void Function_Second()
{
try
{
// do something which could be occur exception.
}
catch (Exception error)
{
_Log.RecordErrorInfo("函數Function_Second", error.Message.ToString(), "執行函數Function_Second時，發生異常！");
_Log.SaveLogToFile();
}
}
}
class Program
{
static void Main(string[] args)
{
// 創建內建了日志的對象
LogExample Le = new LogExample();
// 執行處理操作一
Le.Function_First();
// 執行處理操作二
Le.Function_Second();
}
}