ASP.NET and XML

1
ASP.NET and XML

• Presented By
• Shravan S. Mylavarapu

2
Overview

• Introduction to XML
• ASP.NET Web Development
• The Role of XML in ASP.NET
• XML Integration in ASP.NET
• Processing XML
• XMLWriter and XMLReader
• Xpath
• XML Serialization

3
Introduction to XML

• XML specification and XML
• XML specification is a set of guidelines,
  defined by the World Wide Web Consortium (W3C),
  for describing structured data in plain text.
• XML is a markup language (like HTML) based on
  tags within angled brackets, and is also a subset
  of SGML (Standard Generalized Markup Language).
• The textual nature of XML makes the data highly
  portable and broadly deployable. XML does not
  have a fixed set of tags. The ability to create
  new tags makes XML a truly extensible language.

4
ASP.NET Web Development

• ASP.NET represents the next generation of web
  development on the Windows platform.
• ASP.NET includes many new features related to
  Web Forms, such as deployment, state management,
  caching, configuration, debugging, data access as
  well as Web Services.
• We will focus on XML features of ASP.NET

5
The Role of XML in ASP.NET

• .NET Framework makes use of XML internally in
  many situations and thus it allows XML to be
  easily used from our applications.
• XML pervades the entire Framework, and ASP.NETs
  XML integration can be used to build highly
  extensible web sites and Web Services.

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XML Integration in ASP.NET

• The System.Xml Namespace
• Create and process XML documents using streaming
  API or DOM
• Query XML documents
• Transform XML documents
• Validate XML documents
• Web Services
• ASP.NET Web Services are programmable logic that
  can be accessed from anywhere on the Internet,
  using HTTP(GET/POST/SOAP) and XML

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XML Integration in ASP.NET (contd)

• SQLXML Managed Classes
• Allow access to SQL Servers native and extended
  XML features.
• The ADO.NET DataSet Class
• Can be serialized as XML and conversely,
  populated from XML
• The .config Files
• Web.config
• C Code Documentation
• /// Used to document the source code with XML tags

8
Processing XML

• Document Object Model
• Using DOM, the parser loads the entire XML
  document into the memory at once as a tree,
  providing random access to it for searching and
  modifying any element in the document.
• Simple API for XML (SAX)
• SAX follows a streaming model, reading an XML
  document character by character as a stream and
  generating events as each element or attribute is
  encountered.

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XmlWriter and XMLReader

• using System.Xml
• lt?xml version"1.0" ?gt    ltBankAccountgt
          ltNumbergt1234lt/Numbergt         ltNamegtRama
  n Nairlt/Namegt         ltTypegtCheckinglt/Typegt
          ltOpenDategt11/04/1974lt/OpenDategt
          ltBalancegt25382.20lt/Balancegt
     lt/BankAccountgt

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XmlWriter

• XmlTextWriter bankWriter null
• bankWriter new XmlTextWriter (m_strFileName,
  null)
• bankWriter.Formatting Formatting.Indented
• bankWriter.Indentation 6
• bankWriter.Namespaces false
• bankWriter.WriteStartDocument()
• bankWriter.WriteStartElement("", "BankAccount",
  "")
• bankWriter.WriteStartElement("", Balance", "")
• bankWriter.WriteString("1234")
• bankWriter.WriteEndElement()
• bankWriter.WriteStartElement("", "Name", "")
• bankWriter.WriteString("Darshan Singh")
• bankWriter.WriteEndElement()

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XmlReader

• XmlTextReader bankReader null
•  bankReader new XmlTextReader
  (m_strFileName)       while (bankReader.Read())
                   if (bankReader.NodeType
  XmlNodeType.Element)            
                  if (bankReader.LocalName.Equals(
  "Name"))                                  
  Console.Write("0 has balance of ",
  bankReader.ReadString())               
                  if (bankReader.LocalName.Equals
  ("Balance"))                                  
  Console.WriteLine("0", bankReader.ReadString())
                                        

12
XPath

• XPath is a standard language for retreiving data
  in XML document.
• System.Xml.XmlNode
• System.Xml.XPath.XPathDocument
• System.Xml.Xpath.XPathNavigator
• Example /BankAccount/Number

13
XML Serialization

• Serialization is the process of converting an
  object into a form that can be readily
  transported. For example, you can serialize an
  object and transport it over the Internet using
  HTTP between a client and a server. On the other
  end, deserialization reconstructs the object from
  the stream.
• XML serialization serializes only the public
  fields and property values of an object into an
  XML stream. XML serialization does not include
  type information. For example, if you have a Book
  object that exists in the Library namespace,
  there is no guarantee that it will be
  deserialized into an object of the same type.

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XML Serialization (contd)

• XMLSerializer class
• Serialize and Deserialize methods
• http//msdn2.microsoft.com/en-us/library/182eeyhh.
  aspx
• Examples
• http//msdn2.microsoft.com/en-us/library/58a18dwa.
  aspx
• http//www.devhood.com/Tutorials/tutorial_details.
  aspx?tutorial_id236

15
References

• Professional ASP.NET XML with C - Wrox
  publications
• .NET and XML Niel M. Bornstein
• http//www.perfectxml.com/articles/xml/msxml30.asp
  intro
• http//www.devhood.com/Tutorials/tutorial_details.
  aspx?tutorial_id236
• http//www.perfectxml.com/articles/xml/msxml30.asp
  intro
• http//www.devhood.com/Tutorials/tutorial_details.
  aspx?tutorial_id236

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• Questions

17

• Thank You