C#操作xml文件无属性

<?xml version="1.0" encoding="utf-8"?> <webclientserver> <city>武汉</city> <qualitystr>(C+M+N)/3</qualitystr> <state>true</state> <servers> <server> <type>WebGISServer</type> <ip>www.zdtx.com</ip> <port>85</port> <url>/WebGIS_Wuhan/Project_webgis/service.asmx</url> <using>true</using> </server> <server> <type>WebTrackingServer</type> <ip>www.zdtx.com</ip> <port>85</port> <url>/WebGIS_Wuhan/Project_webTracking/service.asmx</url> <using>true</using> </server> <server> <type>WebTrackedServer</type> <ip>www.zdtx.com</ip> <port>85</port> <url>/WebGIS_Wuhan/Project_webtracked/service.asmx</url> <using>true</using> </server> <server> <type>WebTilesServer</type> <ip>www.zdtx.com</ip> <port>85</port> <url>/WebGIS_Wuhan/Project_webtiles/service.asmx</url> <using>true</using> </server> </servers> <frequencys> <webtrackedserver>3</webtrackedserver> <webtilesserver>4</webtilesserver> <WebTrackedFrequency>5</WebTrackedFrequency> </frequencys> <users> <user> <name>administrator</name> <password>administrator</password> <gisserver>True</gisserver> <trackingserver>True</trackingserver> <trackedserver>True</trackedserver> <tilesserver>True</tilesserver> <state>True</state> <usermanage>True</usermanage> </user> </users> <clientinfo> <version>1.0.0.115</version> <issueuser>Daniel</issueuser> <issuedate>2008-09-01</issuedate> <issueinfo>此版本仅用于本地测试</issueinfo> <cappstates>Rh</cappstates> <cappadapter>GZ4</cappadapter> </clientinfo> </webclientserver>