The style sheet file that can be extended by XSL. You can format the display of XML, or convert XML into another format.
To learn XSL, you must be familiar with XPath. XSL is as simple and powerful as XPath and is easy to learn.
1. Since XSL can format the XML display style, Let's first look at how to reference the XSL file in XML
As follows:CodeExample:
<? XML version = "1.0" encoding = "UTF-8"?>
<? XML-stylesheet type = "text/XSL" href = "url. XSL"?>
You only need to add <? XML-stylesheet type = "text/XSL" href = "url. XSL"?> You can.
2. XSL format
XSL is also a standard XML file. It starts with an XML file declaration. The root element must be XSL: styleshee, and the root element must have the version attribute to specify the XSL version, and xmlns: XSL = "http://www.w3.org/5o/#/transform, as shown in the following example
<? XML version = "1.0" encoding = "encoding"?>
<XSL: stylesheet version = "1.0" xmlns: XSL = "http://www.w3.org/1999/XSL/Transform">
3. The main points of XSL are as follows: XML
100
This is a blue pig
80
This is a Red Cat
80
This is a green dog
80
This is a green cat
100
This is a blue dog
80
This is a Red Dog
The preceding XML format is as follows:
1) XSL: Template defines the conversion template for matching nodes. The attribute match = "XPath expression" is used to define elements matching the template.
The template that matches the root node is defined as follows:
<XSL: template match = "/">
</XSL: Template>
2) XSL: For-each loop display select = "XPath expression" select node conversion (similarProgramming Language),
In the following example, child elements under pets are selected and the names of child elements are displayed cyclically:
<XSL: For-each select = "/pets/*">
<XSL: value-of select = "Name ()"/>
</XSL: For-each>
3) XSL: If element condition display nodes (similar to the IF statement in programming languages) should be replaced by & lt; and
<XSL: If test = "@ weight & lt; 10">
<I> its weight is less than 10 km </I>
</XSL: If>
4) XSL: multi-branch condition display of choose (similar to the switch statement in programming languages)
<XSL: Choose>
<XSL: When test = "name () = 'pig'">
<I> This is a pig </I>
</XSL: When>
<XSL: otherwise>
<I> This is not a pig </I>
</XSL: otherwise>
</XSL: Choose>
5) XSL: value-of displays the value of the selected node or attribute.
Select sub-node price
<XSL: value-of select = "pets/*/price"/>
Select weight
<XSL: value-of select = "pets/*/@ weight"/>
6) XSL: attribute: Construct the attributes of an XML node.
Used to add attributes to a node, for example:
<Font>
<XSL: attribute name = "color"> <XSL: value-of select = "pets/*/@ color"/> </XSL: attribute>
</Font>
<Font color = "red"> </font>
7) XSL: Apply-templates Application Template
If the XML file structure is complex, you can define multiple templates, and then use the <XSL: Apply-templates> label Application Template, XSL: apply-templates you can specify the select = "XPath" attribute to select the template of the application, or do not specify select to select the template of the current node.
See the following sample XSLT file pets-templates.xsl
Complete sample XSL file: pets. XSL<? XML version = "1.0" encoding = "UTF-8"?> <XSL: stylesheet version = "1.0" xmlns: XSL = "http://www.w3.org/1999/XSL/Transform"> <XSL: template match = "/"> <HTML>complete example file pets-templates.xsl:
<? XML version = "1.0" encoding = "UTF-8"?> <XSL: stylesheet version = "1.0" xmlns: XSL = "http://www.w3.org/1999/XSL/Transform"> <XSL: template match = "/"> <HTML>in C #. net, which can also be used to convert XML documents using compiledtransform. However, this class has been marked obsolete by Microsoft and should not be reused. The following code example:
using system; using system. collections. generic; using system. LINQ; using system. text; using system. io; using system. XML; namespace usexslt {class program {static void main (string [] ARGs) {// declare the xsltransform class instance system. XML. XSL. export compiledtransform trans = new system. XML. XSL. extends compiledtransform (); string effectfile = @ "X: \ about.net \ system. XML \ example \ pets. XSL "; using (streamreader RDR = new streamreader (xsltfile) {using (xmlreader xmlrdr = xmlreader. create (RDR) {// load the XSL file trans. load (xmlrdr) ;}} string inputfile = @ "X: \ about.net \ system. XML \ example \ pets. XML "; string outputfile = @" X: \ about.net \ system. XML \ example \ pets-out.htm "; // convert the source file output to the output file outputfile trans. transform (inputfile, outputfile) ;}}Note that the file converted from xslcompiledtransform is in HTML format, this class automatically adds an unclosed meta tag <meta http-equiv = "Content-Type" content = "text/html; charset = UTF-8 ">; Microsoft has helped us think too much.
XSLT can also specify parameters and define variables. For more information, see related documents.
C # processing XML:
1. read and Write XML documents through xmldocument 2. use xmlreader to read XML, use xmlwriter to write xml3. use LINQ to XML to access xml4. use xmlscheme to define fixed-format XML documents. 5. XML serialization or deserialization Class 6. search for XML nodes using XPath 7. convert XML format using XSLT
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