FileStream fsRead = new FileStream(@"C:\Users\Administrator\Desktop\u.html",FileMode.OpenOrCreate,FileAccess.Read);            byte[] buffer = new byte[1024 * 1024 * 5];            //返回本次读取到的有效字节数           int iNr= fsRead.Read(buffer, 0, buffer.Length);            //将字节数组中每一个元素按指定编码写成字符串            string str =Encoding.UTF8.GetString(buffer,0,iNr);            Console.WriteLine(str);            //关闭文件            fsRead.Close();            //释放资源            fsRead.Dispose();            Console.ReadKey();            //可以自动释放和关闭资源            using (FileStream fsWrite = new FileStream(@"C:\Users\Administrator\Desktop\u.html", FileMode.OpenOrCreate, FileAccess.Write))            {                string strN = "看我把你覆盖掉";                byte[] buf = Encoding.UTF8.GetBytes(strN);                fsWrite.Write(buf, 0, buf.Length);                Console.WriteLine("写入成功");            }            Console.ReadKey();