XmlException: Root element is missing. C# Unity

Question

I'm trying to send a list<clase_A> by xmlSerializer, from an interface to unity.

Here is my server code:

using (connectedTcpClient = tcpListener.AcceptTcpClient())
            {               
                using (NetworkStream stream = connectedTcpClient.GetStream())
                {
                    int length;
                    XmlSerializer xmls = new XmlSerializer(typeof(List<Clase_comando>));
                                        
                    while ((stream.CanRead && (length = stream.Read(bytes, 0, bytes.Length)) != 0))
                    {
                        List<Clase_comando> com = null;
                        var b = new byte[10000];                                                      
                        com = (List<Clase_comando>)xmls.Deserialize(stream);
                            //Here i get the problem
                        

                    }
                }
            }

Here is the code of Visual Studio:

NetworkStream stream = socketConnection.GetStream();
StreamWriter sw = new StreamWriter(stream);
sw.AutoFlush = true;
XmlSerializer xmls = new XmlSerializer(typeof(List<Clase_A>));

if (stream.CanWrite){
   z = My list

   byte[] b = new byte[10000];
   Stream st = new MemoryStream(b);
   xmls.Serialize(st, z);
   stream.Write(b, 0, b.Length);
   stream.Dispose();
   }

The problem is when I receive the interface data in unity, it trow this exception:

XmlException: Root element is missing.  
System.Xml.XmlTextReaderImpl.Throw (System.Exception e) (at <7fd195060d8c41448694ab221d3b56ca>:0)  
System.Xml.XmlTextReaderImpl.ThrowWithoutLineInfo (System.String res) (at <7fd195060d8c41448694ab221d3b56ca>:0)

Answer 1

In this line

while ((stream.CanRead && (length = stream.Read(bytes, 0, bytes.Length)) != 0))

data is read from the stream to the bytes.
After that, there is either no data in the stream at all either the root is already missing.
So on the next line, the serializer reads from the corrupted stream:

com = (List<Clase_comando>)xmls.Deserialize(stream);

---

Try this code:

using (NetworkStream stream = connectedTcpClient.GetStream())
{
    var xmls = new XmlSerializer(typeof(List<Clase_comando>));
            
    var com = (List<Clase_comando>)xmls.Deserialize(stream);
}