读写txt文件

#region 读写log日志string strMsg = string.Empty;string LogName = "F:\\TestLog.txt"; //txt文件路//string LogName = System.Web.HttpContext.Current.Server.MapPath("\\TestLog.txt") if (!File.Exists(LogName)) //判断txt文件是否存在{    FileStream fsnew = File.Create(LogName);    //创建txt文件    fsnew.Close();}using (FileStream fs = File.Open(LogName, FileMode.Append, FileAccess.Write)){    using (StreamWriter w = new StreamWriter(fs)) //向txt文件中添加内容    {        #region        w.BaseStream.Seek(0, SeekOrigin.End);        w.WriteLine("=====================================");        w.Write("添加日期为:" + DateTime.Now.ToString() + "\r\n");        //w.Write("日志内容为:" + strMsg + "\r\n");        w.WriteLine("=====================================");        w.Flush();        w.Close();        #endregion    }}#endregion