ASP.net An example code for adding a pruning operation to an XML document _ Practical skills

XML file name is Bcastr.xml

The structure is as follows:

Copy Code code as follows:

<?xml version= "1.0" encoding= "Utf-8"?>
<bcaster>
<item id= "item_url=" "picnews/img/u=404630538,2075277077" link= "html/050/ai_20081017_50_53_79.html" Itemtitle = "111111111111111111"/>
<item id= "item_url=" picnews/img/index_04_01_06.jpg "link=" html/050/ai_20081017_50_53_78.html "itemtitle=" Zengjia "/>
<item id= "item_url=" "Picnews/img/bsxwf.jpg" link= "html/050/ai_20081017_50_53_77.html" itemtitle= "graduate Department of China Pharmaceutical University" />
<item id= "item_url=" picnews/img/Jiangning gate. jpg "link=" html/050/ai_20081017_50_53_76.html "itemtitle=" Photo News of Graduate Department >
<item id= "item_url=" picnews/img/China Pharmaceutical University School mark (Perfect 2). jpg "link=" html/050/ai_20081017_50_53_75.html "itemtitle=" News test Picture News "/>
</bcaster>

To add a node's function:

Copy Code code as follows:

Write picture news information to the image News Player's XML file set
</summary>
<param name= "Picpath" > Picture path </param>
<param name= "Htmlpath" > Photo 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 home Picture news no more than 5
//{
XmlNode RootNode = Xmldoc.selectsinglenode ("Bcaster");

XmlElement fel = (xmlelement) rootnode. FirstChild;

XmlElement el = xmldoc.createelement ("item");//Add child nodes and properties
El. SetAttribute ("id", aid);
El. SetAttribute ("Item_url", Picpath);
El. SetAttribute ("link", Htmlpath);
El. SetAttribute ("Itemtitle", title);
RootNode. PrependChild (EL)//Add new picture News to the first location
if (XNL. Count > 5)
{
XmlNode lxn = RootNode. LastChild;
RootNode. RemoveChild (LXN)//Delete the end of the picture news
}


Xmldoc.save (HttpContext.Current.Server.MapPath) (". /picnews/bcastr.xml "));
//}
}

function to modify the attributes of an XML node:

Copy Code code as follows:

<summary>
modifying 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)//overwrite if 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 "));
}

To delete a function of the specified XML node:

Copy Code code as follows:

///<summary>
///Delete xml specify node
///</summary>
///& Lt;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)//If the node exists delete
{
Xe. RemoveAll ();
break;
}


Xmldoc.save (HttpContext.Current.Server.MapPath ("...). /picnews/bcastr.xml "));
}