C# 组装byte字节序的问题 在线等

Question

情况如下：
发过来的字节序可以解析成明文，有明文解析代码。
现在要做的是 把明文再原路返回字节序明文：00000008{Code:1}
明文解析代码：
            //前四个字节代表长度
            var headerData = new byte[4];
            Array.Copy(header, offset, headerData, 0, 4);            //得到长度 nLen 此时等于：8
                int nLen = BitConverter.ToInt32(headerData, 0) - 4;
                byte[] byteBodyData = new byte[nLen];
                Array.Copy(bodyBuffer, offset, byteBodyData, 0,nLen);            //得到内容 strBodyData 此时等于： {Code:1}
                string strBodyData = nLen.ToString("D8") + System.Text.Encoding.UTF8.GetString(byteBodyData);现在要将明文  00000008{Code:1}  原路返回byte[]。
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Answer 1

var header = BitConverter.GetBytes(Int32.Parse(strBodyData.Substring(0,8)));
var bodyBuffer = System.Text.Encoding.UTF8.GetBytes(strBodyData.Substring(8));

Answer 2

       //反推
        static void Test2(string strBodyData, out byte[] header, out byte[] bodyBuffer)
        {
            long nLen = Int64.Parse(strBodyData.Substring(0, 8));
            header = BitConverter.GetBytes(nLen + 4);
            bodyBuffer = System.Text.Encoding.UTF8.GetBytes(strBodyData.Substring(8,(int)nLen));
        }