C # some basic operations on XML files [reprint]

The XML file format is as follows:

<? XML version = "1.0" encoding = "UTF-8"?>

<Userdata createuser = "false">

<Dataconnection>

<Server> localhost </Server>

<Uid> SA </uid>

<PWD> </pwd>

</Dataconnection>

<Net>

<Name> jiayuan </Name>

</NET>

</Userdata>

Reads an attribute from a node.

Xmldocument Doc = new xmldocument ();

Doc. Load ("config. xml"); // you can add another path, for example, D: \ config. xml.

Xmlnode xnuser = Doc. selectsinglenode ("userdata ");

String flag = xnuser. attributes ["createuser"]. innertext;

Read the value from the node

Xmldocument Doc = new xmldocument ();

Doc. Load ("config. xml ");

Xmlnode xnserver = Doc. selectsinglenode ("userdata/dataconnection/Server ");

Modify node attributes

Xmldocument Doc = new xmldocument ();

Doc. Load ("config. xml ");

Xmlnode xnuser = Doc. selectsinglenode ("userdata ");

Xnuser. attributes ["createuser"]. innertext = "false ";

Doc. Save ("config. xml ");

Append node

Xmldocument Doc = new xmldocument ();

Xmltextreader reader = new xmltextreader ("config. xml ");

Doc. Load ("config. xml ");

Xmlelement root = Doc. documentelement; // get the root node

Xmlelement tagmessage = Doc. createelement ("Net ");

Xmlelement tagtext = Doc. createelement ("name ");

Tagtext. innertext = netname;

Tagmessage. appendchild (tagtext); // append to the end of the XML text

Root. appendchild (tagmessage );

Reader. Close (); // close xmltextreader

Doc. Save ("config. xml"); // Save the XML file