FileStream操作文件读写

   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();