C # XML Read-write instance

First, the use of System.Xml

Example: Complete the Read and write operation of the following format configuration file:

<?xml version="1.0" encoding="UTF-8"? ><! DOCTYPE doc[]><root>  <DatabaseInfo>    <HostName>127.0.  0.1</HostName>    <DatabaseName>orcl</DatabaseName>    <username>scott</ username>    <Password>scott</Password>  </DatabaseInfo></root>

Implementation code:

Read operation public static string Getconectstringxml () {XmlDocument xmldoc = new XmlDocument (); Xmldoc.load (Dbconfigfilepath);            Load XML Document String XPath = "/root";            XmlNode XmlNode = Xmldoc.selectsinglenode (XPath);                if (XmlNode! = null) {XmlNode = Xmlnode.selectsinglenode ("/root/databaseinfo");                var TST = Xmlnode.selectsinglenode ("/root/databaseinfo/hostname"); String hostName = TST.                INNERXML; String sid = Xmlnode.selectsinglenode ("/root/databaseinfo/databasename").                INNERXML; String uid = Xmlnode.selectsinglenode ("/root/databaseinfo/username").                INNERXML; string pwd = Xmlnode.selectsinglenode ("/root/databaseinfo/password").                INNERXML;                StringBuilder connectstr = new StringBuilder ();                Connectstr.append ("Data source=" (Description= (address_list= (address=) (PROTOCOL=TCP); Connectstr.append (HostName);                Connectstr.append (") (port=1521))) (Connect_data= (service_name=");                Connectstr.append (SID); Connectstr.append (")));                User id= ");                Connectstr.append (UID); Connectstr.append (";                Password = ");                Connectstr.append (PWD); Connectstr.append (";                Unicode=true ");            connectionString = Connectstr.tostring ();        } return connectionString; }//write operation public static void Setconectstringxml (String hostname,string sid,string uid,string pwd) {XMLDOCU            ment xmldoc = new XmlDocument (); Xmldoc.load (Dbconfigfilepath);            Load XML Document String XPath = "/root";            XmlNode XmlNode = Xmldoc.selectsinglenode (XPath);                if (XmlNode! = null) {XmlNode = Xmlnode.selectsinglenode ("/root/databaseinfo");                var subnode = Xmlnode.selectsinglenode ("/root/databaseinfo/hostname"); Subnode.innerxml = HostName;                subnode = Xmlnode.selectsinglenode ("/root/databaseinfo/databasename");                Subnode.innerxml = SID;                subnode = Xmlnode.selectsinglenode ("/root/databaseinfo/username");                Subnode.innerxml = UID;                subnode = Xmlnode.selectsinglenode ("/root/databaseinfo/password");                Subnode.innerxml = pwd;            Xmldoc.save (Dbconfigfilepath); }        }

　　

C # XML Read-write instance