Instance code for adding and deleting operations in the Asp.net XML document

The XML file name is bcastr. xml.

The structure is as follows:
Copy codeThe Code is as follows:
<? Xml version = "1.0" encoding = "UTF-8"?>
<Bcaster>
<Item id = "79" item_url = "PicNews/Img/u = 404630538,2075277077" link = "HTML/050/AI_20081017_50_53_79.html" itemtitle = "111111111111111111"/>
<Item id = "78" item_url = "PicNews/Img/Index_04_01_06.jpg" link = "HTML/050/AI_20081017_50_53_78.html" itemtitle = "zengjia"/>
<Item id = "77" item_url = "PicNews/Img/bsxwf.jpg" link = "HTML/050/AI_20081017_50_53_77.html" itemtitle = "Graduate Department of China Pharmaceutical University"/>
<Item id = "76" item_url = "PicNews/Img/Jiangning Damen .jpg" link = "HTML/050/AI_20081017_50_53_76.html" itemtitle = ""/>
<Item id = "75" item_url = "PicNews/Img/Chinese Pharmaceutical University certification (perfect 22.16.jpg" link = "HTML/050/AI_20081017_50_53_75.html" itemtitle = "News test picture news"/>
</Bcaster>

Add node functions:
Copy codeThe Code is as follows:
/// Write the image news information to the XML file set of the image news player
/// </Summary>
/// <Param name = "picpath"> image path </param>
/// <Param name = "htmlpath"> image news URL </param>
/// <Param name = "title"> title </param>
Public void WritePicNewsXML (string picpath, string htmlpath, string title, string aid)
{
XmlDocument xmlDoc;
XmlDoc = new XmlDocument ();
XmlDoc. Load (HttpContext. Current. Server. MapPath ("../PicNews/bcastr. xml "));

XmlNodeList xnl = xmlDoc. SelectSingleNode ("bcaster"). ChildNodes;
// If (xnl. Count <= 5) // keep no more than 5 homepage pictures and news
//{
XmlNode rootnode = xmlDoc. SelectSingleNode ("bcaster ");

XmlElement fel = (XmlElement) rootnode. FirstChild;

XmlElement el = xmlDoc. CreateElement ("item"); // Add subnodes and attributes
El. SetAttribute ("id", aid );
El. SetAttribute ("item_url", picpath );
El. SetAttribute ("link", htmlpath );
El. SetAttribute ("itemtitle", title );
Rootnode. PrependChild (el); // Add the newly added image news to the first position.
If (xnl. Count> 5)
{
XmlNode lxn = rootnode. LastChild;
Rootnode. RemoveChild (lxn); // deletes the final picture news.
}


XmlDoc. Save (HttpContext. Current. Server. MapPath ("../PicNews/bcastr. xml "));
//}
}

Function for modifying the attributes of an XML node:
Copy codeThe Code is as follows:
/// <Summary>
/// Modify XML attributes
/// </Summary>
/// <Param name = "picpath"> </param>
/// <Param name = "htmlpath"> </param>
/// <Param name = "title"> </param>
/// <Param name = "aid"> </param>
Public void EditPicNewsXML (string picpath, string htmlpath, string title, string aid)
{

XmlDocument xmlDoc;
XmlDoc = new XmlDocument ();
XmlDoc. Load (HttpContext. Current. Server. MapPath ("../PicNews/bcastr. xml "));

XmlNodeList xnl = xmlDoc. SelectSingleNode ("bcaster"). ChildNodes;
Foreach (XmlNode xn in xnl)
{
XmlElement xe = (XmlElement) xn;
If (xe. GetAttribute ("id") = aid) // rewrite if a node exists
{
Xe. SetAttribute ("item_url", picpath );
Xe. SetAttribute ("link", htmlpath );
Xe. SetAttribute ("itemtitle", title );
Break;
}
}

XmlDoc. Save (HttpContext. Current. Server. MapPath ("../PicNews/bcastr. xml "));
}

Function used to delete a specified XML node:
Copy codeThe Code is as follows:
/// <Summary>
/// Delete the specified XML Node
/// </Summary>
/// <Param name = "aid"> </param>
Public void DelPicNewsXML (string aid)
{
XmlDocument xmlDoc;
XmlDoc = new XmlDocument ();
XmlDoc. Load (HttpContext. Current. Server. MapPath ("../PicNews/bcastr. xml "));

XmlNodeList xnl = xmlDoc. SelectSingleNode ("bcaster"). ChildNodes;
Foreach (XmlNode xn in xnl)
{
XmlElement xe = (XmlElement) xn;
If (xe. GetAttribute ("id") = aid) // delete a node if it exists
{
Xe. RemoveAll ();
Break;
}
}

XmlDoc. Save (HttpContext. Current. Server. MapPath ("../PicNews/bcastr. xml "));
}