C#对象类型转换为Byte[]，通过TCP发送并转换回double

Question

TcpClient                   _client;
NetworkStream               _stream = null;
byte[]                      _data = new byte[8192];

{...}
try
{
    _client     = new TcpClient(properties.IpAddress, properties.Port);
}
{...}
    try
    {
        _stream     = _client.GetStream();
{...}
        int NumBytesInRecvBuffer = _stream.Read(_data, 0, 8192);

{...}
            if(_data[3] == paramCount)
            {
                for(int i = 0; i < paramCount; i++)
                {
                    double Value = MakeDouble(_data, 4+(i*8));
                    fmacsParams[i].NumericalValue = Value;
                }
            }
    }

private unsafe double MakeDouble(byte[] data, int StartIndex)
{
    double result;
    byte* b = (byte*)&result;
    b[0] = data[StartIndex + 7];
    b[1] = data[StartIndex + 6];
    b[2] = data[StartIndex + 5];
    b[3] = data[StartIndex + 4];
    b[4] = data[StartIndex + 3];
    b[5] = data[StartIndex + 2];
    b[6] = data[StartIndex + 1];
    b[7] = data[StartIndex + 0];
    return(result);         
}

 object ft107Flow = oType.InvokeMember("GetValue", System.Reflection.BindingFlags.InvokeMethod, null, wincc, new object[] { "FT107_Flow" });

{...}
const int paramCount = 30;
double[] WinCC_Tags = new double[paramCount];

WinCC_Tags[0] = Convert.ToDouble(ft107Flow);
{...}
byte[] data = new byte[4 + paramCount * 8];
Array.Clear(data, 0, data.Length);

byte[] UnswappedByte;
byte[] SwappedByte;

data[3] = paramCount;

for (int i = 0; i < paramCount; i++)
{
     int j;

     UnswappedByte = BitConverter.GetBytes(WinCC_Tags[i]);
     SwappedByte = SwapBytes(UnswappedByte, 0);

     j = (4 + i * 8);

     data[j] = SwappedByte[0];
     data[j + 1] = SwappedByte[1];
     data[j + 2] = SwappedByte[2];
     data[j + 3] = SwappedByte[3];
     data[j + 4] = SwappedByte[4];
     data[j + 5] = SwappedByte[5];
     data[j + 6] = SwappedByte[6];
     data[j + 7] = SwappedByte[7];
}

例如，在WinCC运行时中，标记值为15.3。当转换为double时，它等于15.30000190734863。则数据[12..19]={0x40,0x2E,0x99,0x99,0xA0,0x00,0x00,0x00}。

客户端收到的数据如下：

_data[12..19]={0x40,0x2E,0x99,0x99,0xA0,0x00,0x00,0x00}

Answer 1

using (MemoryStream stream = new MemoryStream())
using (BeBinaryReader BeReader = new BeBinaryReader(stream))
{
    stream.Position = 3;
    if(BeReader.ReadByte() == paramCount)
    for (int i = 0; i < paramCount; i++)
    {
       double Value = BeReader.ReadDouble();
       fmacsParams[i].NumericalValue = Value;
    }
 }