问使用Windows桌面共享API的C#桌面共享

EN

// you need to fix the port in order to know the port 
// that  StartReverseConnectListener will use
IRDPSRAPISessionProperties RdpProperties = Viewer.Properties as IRDPSRAPISessionProperties;
RdpProperties["PortId"] = Myport;


 private string AddExIP(string viewerConnectionString)
        {
            TextReader tr = new StringReader(viewerConnectionString);
            XDocument doc = XDocument.Load(tr);

            // get external ip 
            // From http://stackoverflow.com/a/16109156/2573450
            string url = "http://checkip.dyndns.org";
            System.Net.WebRequest req = System.Net.WebRequest.Create(url);
            System.Net.WebResponse resp = req.GetResponse();
            System.IO.StreamReader sr = new System.IO.StreamReader(resp.GetResponseStream());
            string response = sr.ReadToEnd().Trim();
            string[] a = response.Split(':');
            string a2 = a[1].Substring(1);
            string[] a3 = a2.Split('<');
            string a4 = a3[0];
            string ExternalIp = a4;

            // Add to connection string
            doc.Element("E").Element("C").Element("T").Add(new XElement("L",
                new XAttribute("P", MyportasString),
                new XAttribute("N", ExternalIp)
                ));
            return doc.ToString();
        }

string viewerConnString = Viewer.StartReverseConnectListener(SessionInvitation, Myname, Mypass);

String NewConnectionString = AddExIP(viewerConnString);