Introduction to Web Services Srinath Vasireddy Support Professional Developer Support Microsoft 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  Q&A

3 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

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

5 XML  Extensible Markup Language  Language for describing documents with structured data  Industry standard  XML Schemas – XSD XML based XML based Language for describing data types Language for describing data types  For more information, read:

6 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:

7 WSDL  It is an XML document describing Web services Define data types (XSD) Define data types (XSD) Define messages in terms of types Define messages in terms of types Define bindings to transport protocol, message format Define bindings to transport protocol, message format SOAP 1.1, HTTP Get/Post, MIME SOAP 1.1, HTTP Get/Post, MIME Define services as collections of ports Define services as collections of ports  WSDL.exe  For more information read:

8 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

9 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:

10 Web Services Platform  ASP.NET  ATL Server .NET remoting  Microsoft ® SOAP Toolkit

11 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

12 Creating a Web Service (1)  Open Microsoft Visual Studio ®.NET  Select the language  Select the project type: ASP.NET Web Service

13 Creating a Web Service (2) .asmx and.asmx.cs  Web.config  Global.asax  WebService1.vsdisco

14 Creating a Web Service (3)  Inside Service1.asmx WebService Language="c#" Codebehind="Service1.asmx.cs" Class="WebService1.Service1" %>

15 Creating a Web Service (4) Inside Service1.asmx.cs  Add WebService attribute’s Namespace property [WebMethod] public string HelloWorld() { return "Hello World"; } [WebService(Namespace=" public class Service1 : System.Web.Services.WebService  Uncomment the following code:

16 Creating a Web Service (5)  Compile the Web service

17 Creating a Web Service (6)  Run the Web service

18 Creating a Web Service Client (1)  Create a Microsoft Visual C#™ console application

19 Creating a Web Service Client (2)  Add Web reference (1)

20 Creating a Web Service Client (3)  Add Web reference (2)

21 Creating a Web Service Client (4)  Proxy file is created: Reference.cs

22 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()); }

23 Creating a Web Service Client (6)  Run the Web service client

24 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!

25 References  Programming the Web with XML Web services Visual Studio.NET Help ms-help://MS.VSCC/MS.MSDNVS/vsent7/html/vxconProgrammableWebServices.htm  XML and SOAP Serialization Visual Studio.NET Help ms-help://MS.VSCC/MS.MSDNVS/cpguide/html/cpconserialization.htm  Web Services Community Go to On left frame, drill down to On left frame, drill down to.NET Development > Framework > dotnet.framework.aspnet.webservices.NET Development > Framework > dotnet.framework.aspnet.webservices

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