Question

myByte – all bytes are zero

a = “AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA==”

    var memoryStream = new MemoryStream();
    var binaryFormatter = new BinaryFormatter();
    binaryFormatter.Serialize(memoryStream, m_workspace.ListPlatforms.ToArray());

    myByte = new byte[memoryStream.Length];
    memoryStream.Seek(0, SeekOrigin.Begin);
    memoryStream.Write(myByte, 0, myByte.Length);

    string a = System.Convert.ToBase64String(myByte);

what could be the reason

Answer 1

You’re calling Write when I suspect you meant to call Read. In other words, you’re writing from a newly created (and thus full-of-zeroes) array to the MemoryStream which has your serialized data in. Using Read instead of Write will read into the array from the stream.

It would be simpler to call ToArray though:

byte[] myByte = memoryStream.ToArray();