C# xml处理
xml结构如下：
<?xml version="1.0" encoding="UTF-8" standalone="no" ?>
<cfgfile:cmconfigdatafile xmlns:RAN="http://www.huawei.com/specs/huawei_cme_GERAN_NRM_baseline_all" xmlns:cfgfile="http://www.huawei.com/specs/huawei_cme_RAN6.0_BulkCM_FileFormat_baseline_1.0.0" xmlns:gn="http://www.huawei.com/specs/huawei_CME_GenericNRMdescription_baseline_1.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.huawei.com/specs/huawei_cme_GERAN_NRM_baseline_all CMEERAN_NRM_Spec_ALL.xsd http://www.huawei.com/specs/huawei_cme_RAN6.0_BulkCM_FileFormat_baseline_1.0.0 CMEERANcfgCMData_spec.xsd http://www.huawei.com/specs/huawei_CME_GenericNRMdescription_baseline_1.0.0 CMEERANGenericNRM.xsd">

  <cfgfile:fileheader filetype="ExportFile"/>
  <cfgfile:subsession neid="10.144.255.46" netype="eNodeBNE" neversion="DBS3900 LTE V100R005C00" opmode="BreakonFailure">
    <gn:DataContainer>
      <RAN:eNodeB_3.0>
        <ENODEB>
          <attributes>
            <AUTOPOWEROFFSWITCH>1</AUTOPOWEROFFSWITCH>
            <ENODEBID>360</ENODEBID>
            <GCDF>0</GCDF>
            <LATITUDE>0</LATITUDE>
            <LOCATION>Testbed</LOCATION>
            <LONGITUDE>0</LONGITUDE>
            <NAME>360</NAME>
            <POWEROFFTIME>00:00:00</POWEROFFTIME>
            <POWERONTIME>06:00:00</POWERONTIME>
          </attributes>
          <TRANSPORT>
            <IPRT>
              <attributes>
                <CN>0</CN>
                <DESCRI>OAM IKE tunnel</DESCRI>
                <DSTIP>172.27.13.84</DSTIP>
                <DSTMASK>255.255.255.255</DSTMASK>
                <NEXTHOP>10.80.217.49</NEXTHOP>
                <PREF>50</PREF>
                <RTTYPE>0</RTTYPE>
                <SBT>0</SBT>
                <SN>7</SN>
                <SRN>0</SRN>