Method for reading and writing XML files in C # (xmlreader, xmlwriter)
There are several methods available. You can take a look.
Http://fmouz.spaces.live.com/blog/cns! A3e6bf121783821a! 22035. Entry [go] C # the Getting Started Method for reading and writing XML files is known to have an XML file (bookstore. XML) as follows: <? XML version = "1.0" encoding = "gb2312"?>
<Bookstore>
<Book genre = "Fantasy" ISBN = "2-3631-4">
<Title> Oberon's legacy </title>
<Author> corets, Eva </author>
<Price> 5.95 </price>
</Book>
</Bookstore>
1. Insert a <book> node to the <bookstore> node:Xmldocument xmldoc = new xmldocument ();
Xmldoc. Load ("Bookstore. xml"); xmlnode root = xmldoc. selectsinglenode ("Bookstore"); // query <bookstore>
Xmlelement xe1 = xmldoc. createelement ("book"); // create a <book> node
Xe1.setattribute ("genre", "lizan red"); // you can specify the genre attribute of the node.
Xe1.setattribute ("ISBN", "2-3631-4"); // set the ISBN attribute of the node xmlelement xesub1 = xmldoc. createelement ("title ");
Xesub1.innertext = "Cs from entry to entry"; // set a text node
Xe1.appendchild (xesub1); // Add it to the <book> node
Xmlelement xesub2 = xmldoc. createelement ("author ");
Xesub2.innertext = "Hou Jie ";
Xe1.appendchild (xesub2 );
Xmlelement xesub3 = xmldoc. createelement ("price ");
Xesub3.innertext = "58.3 ";
Xe1.appendchild (xesub3); root. appendchild (xe1); // Add it to the <bookstore> node
Xmldoc. save ("Bookstore. XML "); // ================================================ ========= the result is: <? XML version = "1.0" encoding = "gb2312"?>
<Bookstore>
<Book genre = "Fantasy" ISBN = "2-3631-4">
<Title> Oberon's legacy </title>
<Author> corets, Eva </author>
<Price> 5.95 </price>
</Book>
<Book genre = "Li zanhong" ISBN = "2-3631-4">
<Title> Cs from entry to entry </title>
<Author> Hou Jie </author>
<Price> 58.3 </price>
</Book>
</Bookstore>
2. Modify the node: Change the genre value of the node whose genre attribute value is "Li zenhong" to "Update Li zenhong ", modify the text of the child node <author> of the node to "Yasheng ".Xmlnodelist nodelist = xmldoc. selectsinglenode ("Bookstore"). childnodes; // obtain all the subnodes of the bookstore Node
Foreach (xmlnode Xn in nodelist) // traverses all subnodes
{
Xmlelement Xe = (xmlelement) xn; // converts the subnode type to the xmlelement type
If (Xe. getattribute ("genre") = "") // If the genre attribute value is ""
{
Xe. setattribute ("genre", "Update lizan red"); // modify this attribute to "Update lizan red" xmlnodelist NLS = Xe. childnodes; // continue to obtain all the child nodes of the Xe subnode
Foreach (xmlnode xn1 in NLS) // traverse
{
Xmlelement xe2 = (xmlelement) xn1; // Conversion Type
If (xe2.name = "author") // If you find
{
Xe2.innertext = "Yasheng"; // modify
Break; // find and exit.
}
}
Break;
}
} Xmldoc. Save ("Bookstore. xml"); // save. // ================================================ ============= The final result is: <? XML version = "1.0" encoding = "gb2312"?>
<Bookstore>
<Book genre = "Fantasy" ISBN = "2-3631-4">
<Title> Oberon's legacy </title>
<Author> corets, Eva </author>
<Price> 5.95 </price>
</Book>
<Book genre = "Update Li zanhong" ISBN = "2-3631-4">
<Title> Cs from entry to entry </title>
<Author> Yasheng </author>
<Price> 58.3 </price>
</Book>
</Bookstore>
3. Delete the genre attribute of the <book genre = "Fantasy" ISBN = "2-3631-4"> node, delete the <book genre = "Update lizan red" ISBN = "2-3631-4"> node.Xmlnodelist xnl = xmldoc. selectsinglenode ("Bookstore"). childnodes; foreach (xmlnode Xn in xnl)
{
Xmlelement Xe = (xmlelement) xn;
If (Xe. getattribute ("genre") = "Fantasy ")
{
Xe. removeattribute ("genre"); // Delete genre attributes
}
Else if (Xe. getattribute ("genre") = "Update lizanhong ")
{
Xe. removeall (); // delete all content of the node
}
}
Xmldoc. save ("Bookstore. XML "); // ================================================ =====
The final result is: <? XML version = "1.0" encoding = "gb2312"?>
<Bookstore>
<Book ISBN = "2-3631-4">
<Title> Oberon's legacy </title>
<Author> corets, Eva </author>
<Price> 5.95 </price>
</Book>
<Book>
</Book>
</Bookstore>
4. display all data.Xmlnode xn = xmldoc. selectsinglenode ("Bookstore"); xmlnodelist xnl = xn. childnodes;
Foreach (xmlnode xnf in xnl)
{
Xmlelement Xe = (xmlelement) xnf;
Console. writeline (Xe. getattribute ("genre"); // display attribute values
Console. writeline (Xe. getattribute ("ISBN"); xmlnodelist xnf1 = Xe. childnodes;
Foreach (xmlnode xn2 in xnf1)
{
Console. writeline (xn2.innertext); // displays the child node text.
}
} Added content in 20172010.09.19 <? XML version = "1.0" encoding = "UTF-8"?>
<D3dversion>
<Version_display> 1 </version_display>
</D3dversion> read an XML file // version XML
String strlocdir = system. appdomain. currentdomain. basedirectory;
String strversion = "Sony 2D/3D converter software" + "/R/N" + "MPES-2D3D1 ";
Strversion + = "/R/N ";
Strversion + = "/R/N ";
Strversion + = "version: 1.00 ";
String verxmlpath = strlocdir + "2d3dversion. xml ";
String strrc1flag = "0"; xmldocument xmldoc = new xmldocument ();
Xmldoc. Load (verxmlpath); xmlnode xn = xmldoc. selectsinglenode ("d3dversion"); xmlnodelist xnl = xn. childnodes; foreach (xmlnode xnf in xnl)
{
Xmlelement Xe = (xmlelement) xnf;
// Console. writeline (Xe. getattribute ("version_display"); // display attribute values
Xmlnodelist xnf1 = Xe. childnodes;
Foreach (xmlnode xn2 in xnf1)
{
Strrc1flag = xn2.innertext;
}
} Write a file // verxml into your desired folder
String verxmlpath = strlocdir + "2d3dversion. xml"; xmltextwriter textwriter = new xmltextwriter (verxmlpath, encoding. utf8 );
Textwriter. Formatting = formatting. indented; // start the write process and call the writestartdocument method.
Textwriter. writestartdocument (); // write description
// Textwriter. writecomment ("first comment xmltextwriter sample example ");
// Textwriter. writecomment ("w3sky. XML in root dir"); // create a node
Textwriter. writestartelement ("2d3dversion ");
Textwriter. writeelementstring ("version_display", "0 ");
Textwriter. writeendelement (); // The end of writing a document. Call the writeenddocument method.
Textwriter. writeenddocument (); // disable textwriter
Textwriter. close (); ========================================================== ========================================================== = serialization method, read and Write XML files <? XML version = "1.0" encoding = "UTF-8"?>
<Ksbmconfig xmlns: xsi = "http://www.w3.org/2001/XMLSchema-instance" xmlns: XSD = "http://www.w3.org/2001/XMLSchema">
<Connectstring> connectstring1 </connectstring>
<Serverpath> serverpath1 </serverpath>
<Smtpserver> smtpserver1 </smtpserver>
</Ksbmconfig> Create a class that contains the XML data structure: Public class ksbmconfig <br/>{< br/> /// <summary> <br/> /// </Summary> <br/> public ksbmconfig () <br/>{< br/>}</P> <p> private string _ connectstring; <br/> /// <summary> <br/> // connectstring. <br/> // </Summary> <br/> Public String connectstring <br/>{< br/> get {return _ connectstring ;} <br/> set {_ connectstring = value ;}< br/>}</P> <p> private string _ serverpath; <br/> /// <summary> <br/> // serverpath. <br/> // </Summary> <br/> Public String serverpath <br/>{< br/> get {return _ serverpath ;} <br/> set {_ serverpath = value ;}< br/>}</P> <p> private string _ smtpserver; <br/> // <summary> <br/> // SMTP. <br/> // </Summary> <br/> Public String smtpserver <br/> {<br/> get {return _ smtpserver ;} <br/> set {_ smtpserver = value ;} <br/>}< br/> /// <summary> <br/> // initial stage <br/> /// </Summary> <br/> Public void Init () <br/>{< br/> _ connectstring = ""; <br/> _ serverpath = ""; <br/> _ smtpserver = ""; <br/>}< br/>}When the button is pressed, read and write the XML file (note the package to be introduced) Private void button#click (Object sender, eventargs e) <br/>{< br/> string apath = system. io. path. getdirectoryname (system. reflection. assembly. getexecutingassembly (). location); <br/> apath = system. io. path. combine (apath, "1.xml"); </P> <p> // read <br/> ksbmconfig setting = loadfromxml (apath); </P> <p> setting. connectstring = "connectstring123"; <br/> setting. serverpath = "serverpath123"; <br/> setting. sm Tpserver = "smtpserver123"; </P> <p> // write <br/> bool B = savetoxml (apath, typeof (ksbmconfig), setting ); <br/>}</P> <p> Public static ksbmconfig loadfromxml (string filename) <br/>{< br/> ksbmconfig asetting = NULL; <br/> system. io. filestream FS = NULL; </P> <p> try <br/>{< br/> system. XML. serialization. xmlserializer serializer <br/> = new system. XML. serialization. xmlserializer (typeof (ksbmconfig); <br /> FS = new system. io. filestream (filename, system. io. filemode. open); <br/> asetting = (ksbmconfig) serializer. deserialize (FS); <br/>}< br/> catch (system. exception ex) <br/>{< br/> console. writeline (ex. tostring (); <br/>}< br/> finally <br/>{< br/> If (FS! = NULL) <br/>{< br/> FS. close (); <br/>}</P> <p> return asetting; <br/>}</P> <p> Public static bool savetoxml (string filename, system. type type, object target) <br/>{< br/> system. XML. serialization. xmlserializer serializer = NULL; <br/> system. io. streamwriter writer = NULL; <br/> bool issaved = false; </P> <p> try <br/>{< br/> writer = new system. io. streamwriter (filename, false); <br/> Seri Alizer = new system. XML. serialization. xmlserializer (type); <br/> serializer. serialize (writer, target); <br/> issaved = true; <br/>}< br/> catch (system. exception ex) <br/>{< br/> console. writeline (ex. tostring (); <br/>}< br/> finally <br/>{< br/> If (writer! = NULL) <br/>{< br/> writer. close (); <br/>}</P> <p> return issaved; <br/>}< br/>
