XML解析

下面是xml解析的代码：

 private void readEnvelope(string str)
        {
        

            // <soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"><soap:Body 

            //xmlns:amp="http://schemas.altigen.com/mobility/"><amp:Session>c2lwOmtpbm8uc29uZ0BtY3MuY29tO29wYXF1ZT11c2VyOmVwaWQ6VEJsMkNHVlRmMS1TZ05HS

            //DFJMFhoQUFBO2dydXU</amp:Session><amp:ConferenceUpdate sequenceId="23628" type="2" version="1.0">
            //<ConfID>41869784-3b1d-4619-af5d-

            //96253c5f7bf0</ConfID><State>6</State>
            //<Members type="Line">

             //<Member><ID>kino.song@mcs.com</ID><Address>sip:kino.song@mcs.com</Address>
            //<Display>Kino Song</Display>
            //</Member>

            //<Member><ID>ocsuser360@mcs.com</ID><Address>sip:ocsuser360@mcs.com</Address>
            //</Member>
            //<Member><ID>yvonehu@mcs.com
            //</ID><Address>sip:yvonehu@mcs.com</Address><Display>yvone 
            //hu</Display></Member>

            //</Members>
            //</amp:ConferenceUpdate></soap:Body></soap:Envelope>


            try
            {
                XDocument doc = XDocument.Parse(str);

                XElement conferenceUpdateRespElement = doc.Descendants(amp + "ConferenceUpdate").FirstOrDefault();

                if (conferenceUpdateRespElement == null)
                {
                    //not a conference update event
                    return;
                }

                updated = true;

                this._confId = XMLUtils.TryGetElementValue(conferenceUpdateRespElement, "ConfID", "");

                this._conferenceState = XMLUtils.TryGetElementValue(conferenceUpdateRespElement, "State", "");

                int.TryParse(XMLUtils.TryGetElementAttribute(conferenceUpdateRespElement, "sequenceId", string.Empty), out this._sequenceId);

                string type = XMLUtils.TryGetElementAttribute(conferenceUpdateRespElement, "type", string.Empty);

                XElement membersElement = conferenceUpdateRespElement.Descendants("Members").FirstOrDefault();

                string memberType = XMLUtils.TryGetElementAttribute(membersElement, "type", string.Empty);

                this._memberLine = string.Equals(memberType, "type", StringComparison.CurrentCultureIgnoreCase);

                var memberElements = membersElement.Descendants("Member");

                List<CLID> members = new List<CLID>();

                if (this._memberLine)
                {
                    foreach (var item in memberElements)
                    {
                        _participants.Add(
                              new CLID(
                              XMLUtils.TryGetElementValue(item, "ID", "UnKnow"),
                              XMLUtils.TryGetElementValue(item, "Address", "UnKnow"),
                              XMLUtils.TryGetElementValue(item, "Display", "UnKnow")
                                ));
                    }
                }
            }
            catch (Exception ex)
            {
                Utils.e(ex.Message, ex);
            }
         
        }