c# 마샬링

[Serializable]
    [StructLayout(LayoutKind.Sequential, Pack = 1)]
    public struct PLCPS01{
        public short    SubHeader;
        public short    DataLength;
        [MarshalAs(UnmanagedType.ByValArray, SizeConst = 4)]
        public char[]   TransactionCode;
        public double   EE020_WH;
    }


 public byte[] RawSerialize(Type dataType) // 구조체를 바이트배열로
        {
            int RawSize = Marshal.SizeOf(dataType);

            IntPtr buffer = Marshal.AllocHGlobal(RawSize);
            Marshal.StructureToPtr(TestData, buffer, false);
            byte[] RawData = new byte[TestDataSize];
            Marshal.Copy(buffer, RawData, 0, TestDataSize);
            Marshal.FreeHGlobal(buffer);

            return RawData;
        }


// 바이트배열을 구조체로

        public object RawDeSerialize(byte[] data, Type dataType)
        {
            int RawSize = Marshal.SizeOf(dataType);

            if (RawSize > data.Length)
                return null;

            IntPtr buffer = Marshal.AllocHGlobal(RawSize);
            Marshal.Copy(data, 0, buffer, RawSize);
            object objData = Marshal.PtrToStructure(buffer, dataType);
            Marshal.FreeHGlobal(buffer);

            return objData;
        }


TestData = new PLCPS01();
TestDataSize = Marshal.SizeOf(TestData);
DataByte = new byte[TestDataSize];
DataByte = RawSerialize(TestData.GetType());