C#实现将日志写入文本文件的方法

using System.IO;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();    }