Introduction:
There are many ways to read, write and delete the xml tags but here I am using Xpath to read, write and delete the xml tags. It is very easy to read, write and delete the xml tags using X-path because we give the directions (we know where the exact tag of xml is to be changed).
Coding:
If you want to code using Xpath then first use following Namespaces:
Using System.Xml.Xpath;
Using System.Xml;
Here there are many different xml tags (with & without attributes)
Example 1:
If the xml file is like the following xml file:
<?xml version="1.0" encoding="utf-8"?>
<Settings>
<appsettings value=”1”>
<add key = “king” value = “1”/>
</appsettings>
<appsettings value=”2”>
<add > text</add>
</appsettings>
<Bar> Dheeraj </Bar>
</Settings>
Suppose you to read and modify the Bar> tags which contains the innerxml = “Dheeraj” and change the value from “Dheeraj” to “Kumar” then
XmlDocument doc = new XmlDocument();
doc.Load((@"c:/newfile.xml");
XmlNode xnode = doc.SelectSingleNode("//Settings/Bar");
//read the value of “Dheeraj”)
String Str = xnode.Innerxml;
//TO Update the value of “Dheeraj” to “Kumar”
Xnode.innerxml = “kumar”;
//TO delete the value of “Dheeraj” (all nodes of add tag)
Xnode.removeall();
doc.save((@"c:/newfile.xml");
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Example 2:
If the xml file is like the following xml file:
<?xml version="1.0" encoding="utf-8"?>
<Settings>
<appsettings value=”1”>
<add key = “king” value = “1”/>
<appsettings>
<appsettings value=”2”>
<add > text</add> // ?change from “text” to”newtext”
</appsettings>
<Bar>Dheeraj</Bar>
</Settings>
You want to change the value of “text” to “newtext”
XmlDocument doc = new XmlDocument();
doc.Load((@"c:/newfile.xml");
XmlNode xnode = doc.SelectSingleNode("//Settings/appsettings[@value=’2’]/add");
//read the value of “text”)
String Str = xnode.InnerxmlXnode.innerxml = “newtext”;
//TO Update the value of text” to “newtext”
doc.save((@"c:/newfile.xml");
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Example 3:
If the xml file is like the following xml file:
<?xml version="1.0" encoding="utf-8"?>
<Settings>
<header>
<item>
<parameter name = “DB” value = “data”/> // ?change from “data” to”newdata”
<parameter name = “server” value = “new”/>
</item>
</header>
<header>
<item>
<parameter name = “BB” value = “CC”/>
<parameter name = “AA” value = “DD”/>
</item>
</header>
</Settings>
You want to change the value of “data” to “newdata”
XmlDocument doc = new XmlDocument();
doc.Load((@"c:/newfile.xml");
XmlNode xnode = doc.SelectSingleNode("//Settings/header/item/parameter[@name=’ DB’]");
String Str = xnode.Attributes[1].value;//(contains the value of “data”)
//TO Update the value of data” to “newdata”
xnode.Attributes[1].value = “newdata”;
doc.save((@"c:/newfile.xml");
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Example 4:
when i am using data config file , there is a tag called <enterpriseLibrary.databaseSettings> .i was unable to read the child nodes which are present in <enterpriseLibrary.databaseSettings> tag. This is because of the fullstop present in the tag. so the only solution was to take the complete xml file in a string and then just write it in the xml file and save it.
Suppose you have Xml file like this following file:
<parameters.tags>
<parameter name="data" value="exensys" isSensitive="false"/>
<parameter name="server" value="loca" isSensitive="false"/>
because of the parameter.tags i was not able to read the child node "parameter". so what i did was :
String str = " <parameters.tags>
<parameter name=\"data\" value=\"exensys\" isSensitive=\"false\"/>
<parameter name=\"server\" value=\""+txtDB.Text+"\" isSensitive=\"false\"/>"
XmlDocument doc = new XmlDocument();
doc.InnerXml = str;
doc.save((@"c:/newfile.xml");
see in this string , i am just replace "loca" with the value of the textbox valus.
if you have any suggestions please contact me.
Thank you
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