C# 写入文本文件方法

using System;
using System.Data;
using System.Configuration;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Text;
using System.IO;

namespace WebApplication2
{
    public class GetNoteRead
    {
       
        public static void WriteLog(string strLog)
        {
            string sFilePath = "d:\\" + DateTime.Now.ToString("yyyyMM");
            string sFileName = "rizhi" + DateTime.Now.ToString("dd") + ".log";
            sFileName = sFilePath + "\\" + sFileName; //文件的绝对路径
            if (!Directory.Exists(sFilePath))//验证路径是否存在
            {
                Directory.CreateDirectory(sFilePath);//不存在则创建
            }
            FileStream fs;
            StreamWriter sw;
            if (File.Exists(sFileName))//验证文件是否存在，有则追加，无则创建
            {
                fs = new FileStream(sFileName, FileMode.Append, FileAccess.Write);
            }
            else
            {
                fs = new FileStream(sFileName, FileMode.Create, FileAccess.Write);
            }
            sw = new StreamWriter(fs);
            sw.WriteLine(DateTime.Now.ToString("yyyy-MM-dd HH-mm-ss") + "     ---     " + strLog);
            sw.Close();
            fs.Close();

        }

    }
}