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);

         }