c#操作文件实现日志功能

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.IO;

namespace LogDemo
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
/// <summary>
/// 操作文件实现日志
/// </summary>
/// <param name="msg">日志内容</param>
/// <param name="lonPath">存放日志的目录，如果想默认存在项目的Debag下，请输入Null</param>
private void logger(String msg,string lonPath)
{
string LogPath = null;
if (lonPath != null)
{
LogPath = lonPath;
}
else
{
LogPath =Application.StartupPath;
}
string filePath = LogPath + "\\" + DateTime.Now.Year.ToString()+"年" + DateTime.Now.Month.ToString()+"月";
string fileName = DateTime.Now.Day.ToString() + "日" + ".Log";
string filePathAll = filePath + "\\" + fileName;
if (!System.IO.Directory.Exists(filePath))
{
System.IO.Directory.CreateDirectory(filePath);
}
FileStream filestream = new FileStream(filePathAll, FileMode.OpenOrCreate, FileAccess.Write, FileShare.None);
StreamWriter writer = new StreamWriter(filestream, System.Text.Encoding.Default);
writer.BaseStream.Seek(0, SeekOrigin.End);
writer.WriteLine("{0} {1}", DateTime.Now.TimeOfDay , msg);
writer.Flush();
writer.Close();
filestream.Close();
}

//测试方法
private void button1_Click(object sender, EventArgs e)
{
byte str=0 ;

try
{
if (true)
{
str = (byte)Convert.ToSByte(600);
}
else
{
str = (byte)Convert.ToSByte(500);
}
}
catch(Exception ex)
{
logger(ex.Message,null);
}
}
}
}