StreamWriterl流记录日志，类似log4Net

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Web;

namespace Maticsoft.Common
{
    /// <summary>
    /// 
    /// </summary>
    public class LogHelper
    {
        /// <summary>
        /// 
        /// </summary>
        /// <param name="FileName">文件名 log.txt </param>
        /// <param name="str">日志内容</param>
        public static void CreateTxt(string FileName,string str)
        {
            string businessCode = "";
            try
            {
                businessCode=HttpContext.Current.Session[Globals.BusinessCode_String].ToString();
            }
            catch (Exception)
            {
                businessCode = "无";
            }
            string strPath = AppDomain.CurrentDomain.BaseDirectory + "sysLog\" + businessCode + "\" + DateTime.Now.ToString("yyyyMM") + "\";
            if (Directory.Exists(strPath) == false)//如果不存在就创建file文件夹
            {
                Directory.CreateDirectory(strPath);
            }

            string filePath = strPath + "/" + DateTime.Now.ToString("yyyyMMdd") + FileName;

            StreamWriter sw;
            if (!File.Exists(filePath))
            {
                //不存在就新建一个文本文件,并写入一些内容 
                sw = File.CreateText(filePath);
                sw.WriteLine(" 当前日期是:" + DateTime.Now);
                sw.WriteLine(str);
                sw.WriteLine(" ");
            }
            else
            {
                //如果存在就添加一些文本内容 
                sw = File.AppendText(filePath);
                sw.WriteLine(" 当前日期是:" + DateTime.Now);
                sw.WriteLine(str);
                sw.WriteLine(" ");
            }
            sw.Close();
        }
    }
}