Asp.net Method for writing and reading xml, asp.net for reading xml

Asp.net Method for writing and reading xml, asp.net for reading xml

Add namespace

Using System. Xml;

My own code (add nodes)

XmlDocument xmlDoc = new XmlDocument ();
XmlDoc. Load (Server. MapPath ("userTable. xml "));
XmlNode root = xmlDoc. SelectSingleNode ("root"); // query <root>
XmlElement xe1 = xmlDoc. CreateElement ("user"); // create a <user> node
// Xe1.SetAttribute ("genre", "Zhang San"); // you can specify the genre attribute of the node.
// Xe1.SetAttribute ("ISBN", "1-1111-1"); // set the ISBN attribute of the node

XmlElement xesub1 = xmlDoc. CreateElement ("ID ");
Xesub1.InnerText = "" + guid + ""; // set a text node
Xe1.AppendChild (xesub1); // Add it to the <user> node
XmlElement xesub2 = xmlDoc. CreateElement ("yhmc ");
Xesub2.InnerText = "" + username + "";
Xe1.AppendChild (xesub2 );
XmlElement xesub3 = xmlDoc. CreateElement ("tableRealationName ");
Xesub3.InnerText = "" + tableRealation_name + "";
Xe1.AppendChild (xesub3 );
// XmlElement xesub4 = xmlDoc. CreateElement ("imgDescribName ");
// Xesub4.InnerText = "" + imgDescrib_name + "";
// Xe1.AppendChild (xesub4 );
// XmlElement xesub5 = xmlDoc. CreateElement ("imgDescribName ");
// Xesub5.InnerText = "1450 ";
// Xe1.AppendChild (xesub5 );
Root. AppendChild (xe1); // Add it to the <root> node.
XmlDoc. Save (Server. MapPath ("userTable. xml "));

Effect

<? Xml version = "1.0" encoding = "UTF-8"?>
<Root>
<User genre = "zhangsan" ISBN = "1-1111-1">
<ID> guid </ID>
<Yhmc> yhmc </yhmc>
<TableRealationName> tableRealationName </tableRealationName>
</User>
</Root>

Modify the node (Attributes and subnodes)

XmlDocument xmlDoc = new XmlDocument ();
XmlDoc. Load (Server. MapPath ("userTable. xml "));

XmlNodeList nodeList = xmlDoc. SelectSingleNode ("Employees"). ChildNodes; // obtain all child nodes of the Employees 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") = "Zhang San") // if the genre attribute value is "Zhang San"
{
Xe. SetAttribute ("genre", "update Zhang San"); // modify the attribute to "update Zhang San"

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 = "ID"; // modify
}
}
}
}
XmlDoc. Save (Server. MapPath ("userTable. xml"); // Save.

Modify a node (adding node attributes and adding a node's self-node ):

XmlDocument xmlDoc = new XmlDocument ();
XmlDoc. Load (Server. MapPath ("userTable. xml "));

XmlNodeList nodeList = xmlDoc. SelectSingleNode ("Employees"). ChildNodes; // obtain all child nodes of the Employees Node

Foreach (XmlNode xn in nodeList)
{
XmlElement xe = (XmlElement) xn;
Xe. SetAttribute ("test", "111111 ");

XmlElement xesub = xmlDoc. CreateElement ("flag ");
Xesub. InnerText = "1 ";
Xe. AppendChild (xesub );
}
XmlDoc. Save (Server. MapPath ("userTable. xml "));

Read Method

String path = Server. MapPath ("userTable. xml ");
XmlDocument xmldoc = new XmlDocument ();
Xmldoc. Load (path );
// Obtain the specified subnode
XmlNode xn = xmldoc. SelectSingleNode ("root ");
XmlNodeList xnlist = xn. ChildNodes;
Foreach (XmlNode xn1 in xnlist)
{
XmlElement xe = (XmlElement) xn1;
XmlNodeList xnl0 = xe. ChildNodes;
String xmlynbh = xnl0.Item (0). InnerText;
If (xmlynbh = yhbh. ToString ())
{
TableRealationName = xnl0.Item (2). InnerText;
// ImgDescribName = xnl0.Item (3). InnerText;
}