/// <summary>
/// 获取消息体字节数组。
/// <para>如果 <see cref="DESKey"/> 不为空，则使用 <see cref="DES"/> 密钥加密消息体。</para>
/// </summary>
/// <returns></returns>
public byte[] GetBody()
{
List <byte> mb = new List <byte> {
(byte)((ushort)(MessageId) >> 8),
(byte)(MessageId)
};
for (int i = 24; i >= 0; i -= 8)
{
mb.Add((byte)(GatewayId >> i));
}
for (int j = 24; j >= 0; j -= 8)
{
mb.Add((byte)(LuminaireId >> j));
}
if (ParameterList != null)
{
foreach (var pmt in ParameterList)
{
mb.AddRange(pmt.GetParameter());
}
}
else
{
for (int k = 24; k >= 0; k -= 8)
{
mb.Add((byte)(((uint)ErrorCode) >> k));
}
if (ErrorInfo != null)
{
mb.AddRange(ErrorInfo.ToByteArray());
}
}
if (DESKey != null)
{
if (DESKey.Length != 8)
{
throw new ArgumentNullException(nameof(DESKey), $"{typeof(DES)} 密钥长度不正确。");
}
else
{
DESHelper des = new DESHelper();
return(des.Encrypt(DESKey, mb.ToArray()));
}
}
else
{
return(mb.ToArray());
}
}