Introduction to Web Services Srinath Vasireddy Support Professional Developer Support Microsoft Corp

1
Introduction to Web Services Srinath
VasireddySupport ProfessionalDeveloper
SupportMicrosoft Corporation
2
Agenda

• What is a Web service?
• Technologies used
• XML, SOAP, WSDL, DISCO, and UDDI
• Walkthrough creating a Web service
• Walkthrough creating a Web service client
• References
• QA

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What is a Web Service?

• A programmable application component that is
  accessible via standard Internet protocols
• Web page with functions
• Available for a variety of clients
• Examples stock quotes, traffic conditions,
  calculators, news, weather, et cetera

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Technologies Used

• Standard way to represent data
• XML (and XML schemas)
• Common, extensible message format
• SOAP
• Common, extensible contract language
• Web Services Description Language (WSDL)
• Way to discover site services
• Disco
• Way to discover service providers
• Universal Description, Discovery, and Integration
  (UDDI)

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XML

• Extensible Markup Language
• Language for describing documents with structured
  data
• Industry standard
• XML Schemas XSD
• XML based
• Language for describing data types
• For more information, read
• http//msdn.microsoft.com/library/en-us/dnwebsrv
  /html/xmloverchap2.asp

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SOAP

• A simple, XML-based protocol for exchanging
  structured and type information on the Web
• Industry standard
• Lightweight and XML-based protocol
• Can support different protocols and formats
  HTTP, SMTP, and MIME
• SOAP message
• For more information, read
• http//msdn.microsoft.com/soap/

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WSDL

• It is an XML document describing Web services
• Define data types (XSD)
• Define messages in terms of types
• Define bindings to transport protocol, message
  format
• SOAP 1.1, HTTP Get/Post, MIME
• Define services as collections of ports
• WSDL.exe
• For more information read
• http//msdn.microsoft.com/library/en-us/dnwebsrv/
  html/wsdlexplained.asp

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DISCO

• Document Discovery
• A client finds a particular Web services by
  discovery
• Document discovering services at a particular URL
• Document is in XML format
• Document has .disco and .vsdisco extensions
• Disco.exe

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UDDI

• Universal Description, Discovery, and Integration
• Enables businesses to publish and discover
  information about who provides what services
• Specification for distributed Web service
  registries white pages, yellow pages, and
• green pages
• Builds on HTTP, XML, and SOAP
• For more information, read
• http//msdn.microsoft.com/library/
  en-us/dnexxml/html/xml12182000.asp
• http//www.uddi.org/about.html

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Web Services Platform

• ASP.NET
• ATL Server
• .NET remoting
• Microsoft SOAP Toolkit

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ASP.NET Web Service

• Leveraging existing ASP developers
• Easy to build, deploy, and administer as a Web
  application
• File extension is .asmx
• End point is represented by URL

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Creating a Web Service (1)

• Open Microsoft Visual Studio .NET
• Select the language
• Select the project type ASP.NET Web Service

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Creating a Web Service (2)

• .asmx and .asmx.cs
• Web.config
• Global.asax
• WebService1.vsdisco

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Creating a Web Service (3)

• Inside Service1.asmx
• vice1.asmx.cs" Class"WebService1.Service1"

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Creating a Web Service (4)

• Inside Service1.asmx.cs
• Add WebService attributes Namespace property

WebService(Namespace"http//localhost/webservice
1/") public class Service1 System.Web.Services.
WebService

• Uncomment the following code

WebMethod public string HelloWorld() return
"Hello World"
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Creating a Web Service (5)

• Compile the Web service

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Creating a Web Service (6)

• Run the Web service

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Creating a Web Service Client (1)

• Create a Microsoft Visual C console application

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Creating a Web Service Client (2)

• Add Web reference (1)

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Creating a Web Service Client (3)

• Add Web reference (2)

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Creating a Web Service Client (4)

• Proxy file is created Reference.cs

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Creating a Web Service Client (5)

• Client code

using System namespace ConsoleApplication1
class Class1 STAThread
static void Main(string args)
localhost.Service1 wsproxy new
localhost.Service1()
Console.WriteLine(wsproxy.HelloWorld())

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Creating a Web Service Client (6)

• Run the Web service client

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Summary

• What is a Web service?
• Technologies used
• XML, SOAP, WSDL, DISCO, and UDDI
• Walkthrough of creating a Web service
• Walkthrough of creating a Web service client
• Start building Web services today!

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References

• Programming the Web with XML Web services
  Visual Studio .NET Help
• ms-help//MS.VSCC/MS.MSDNVS/vsent7/html/vxconPro
  grammableWebServices.htm
• XML and SOAP Serialization
• Visual Studio .NET Help
• ms-help//MS.VSCC/MS.MSDNVS/cpguide/html/cpconse
  rialization.htm
• Web Services Community Go to
  http//msdn.microsoft.com/newsgroups/managed/defau
  lt.asp
• On left frame, drill down to
• .NET Development Framework
  dotnet.framework.aspnet.webservices

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