C# Byte[]数组读取和写入文件

protected void ByteToString_Click(object sender, EventArgs e)          {                  string content = this.txtContent.Text.ToString();                if (string.IsNullOrEmpty(content))              {                  return;             }              //string 转为byte数组             byte[] array = Encoding.UTF8.GetBytes(content);              //将byte数组转为string             string result = Encoding.UTF8.GetString(array);               Response.Write(result);           }         //利用byte[]数组写入文件         protected void writerFile_Click(object sender, EventArgs e)         {              string content = this.txtContent.Text.ToString();              if (string.IsNullOrEmpty(content))             {                 return;             }              //将string转为byte数组             byte[] array = Encoding.UTF8.GetBytes(content);              string path = Server.MapPath("/test.txt");             //创建一个文件流             FileStream fs = new FileStream(path, FileMode.Create);              //将byte数组写入文件中             fs.Write(array, 0, array.Length);             //所有流类型都要关闭流，否则会出现内存泄露问题             fs.Close();              Response.Write("保存文件成功");           }         //利用byte[]数组读取文件         protected void readFile_Click(object sender, EventArgs e)         {             string path = Server.MapPath("/test.txt");              FileStream fs = new FileStream(path, FileMode.Open);              //获取文件大小             long size = fs.Length;              byte[] array = new byte[size];              //将文件读到byte数组中             fs.Read(array, 0, array.Length);              fs.Close();              //将byte数组转为string             string result = Encoding.UTF8.GetString(array);               Response.Write(result);                        }