XML Web Services: Microsoft .NET

1
XML Web Services Microsoft .NET

• Brand Niemann
• XML Web Services Evangelist
• Data Standards Branch
• December 14, 2001

2
Overview

• 1. Preface
• 2. Introducing Web Services.
• 3. Creating a Simple Web Service with .NET SDK.
• 4. Consuming a Simple Web Service with .NET SDK.
• 5. Creating a Simple Web Service in Visual Studio
  .NET.
• 6. Consuming a Web Service in Visual Studio .NET.
• 7. Three Methods of Calling Web Services.
• 8. Consuming Web Services in Office XP.
• 9. Microsoft .NET Resources.
• 10. Appendix Visual Studio.Net Installation and
  Help.

3
1. Preface

• Source Microsoft .NET XML Web Services, Robert
  Tabor, Sams, Indianapolis, IN, December 2001, 464
  pp.
• 27 Chapters
• Chapters 1-5 basic concepts.
• Chapters 6-27 extend your Web Services.
• Appendix A SOAP, Web Services, and .NET Links on
  the Internet.
• Code listings http//www.soapwebservices.com/book

4
1. Preface

• What are Web Services? (inside front cover)
• I made the mistake of assuming it wasnt as
  earth-shattering cool as it was.
• Web services allow the Internet to connect in a
  way it never has before.
• My somewhat biased opinion is that .NET is the
  best way to build Web Services.
• Bob Tabor is a leading authority on how .NET is
  designed to make it easy for you to build Web
  Services.
• Keith Ballinger, Program Manager, XML Web
  Services, Microsoft Corporation.

5
1. Preface

• Introduction (Robert Tabor)
• In 1997 I thought XML was simply a better way to
  do what was currently being done with comma- or
  tab-delimited files.
• In 1999 I read the SOAP specification and
  realized this technology would provide a more
  standard approach to solve many of the problems I
  had encountered with exchanging information with
  trading partners.
• Besides being a better technical solution, it
  will allow businesses to interact in ways that
  were prohibited in the past and new types of
  businesses will emerge.
• Web Services will fuel the fire of economic
  expansion in the Internet age making it easier
  for companies to exchange information.
• Two goals introduce the fundamental concepts
  behind Web Services and explain advanced concepts
  about building and deploying Web Services for
  real-world use.
• Taken a Visual Studio.NET-centered approach to
  the books examples and this book definitely
  caters to the Visual Studio.Net developer.
• Need a basic understanding of object-oriented
  development and using Visual Studio.Net or C.

6
1. Preface

• Update (Brand Niemann)
• Public Launch in February 2002
• Four years of development.
• 25 programming languages.
• 2.5 million betas distributed.
• Launch Event Site
• http//www.microsoft.com/usa/midatlantic/vsdotnet/
  
• Presentations
• http//www.microsoft.com/usa/presentations/search.
  asp?districtmidatlantic

7
2. Introducing Web Services

• Contents
• Why Web Services?
• Problems with Existing Technologies.
• What is Needed?
• SOAP An Integration Solution.
• Microsofts Implementation of SOAP and Web
  Services.
• The Benefits of ASP.NET Web Services.
• How ASP.NET Web Services Differ from BizTalk.
• What is BizTalk?
• ASP.NET Web Services Are Implemented Using
  ASP.NET.
• Where Do Web Services Fit Into Your Architecture?
• Selecting a Language.
• Selecting a Code Editor.

8
2. Introducing Web Services

• Why Web Services?
• Current e-Business Trends Require Integrating
  Disparate Distributed Systems.
• Business to Business Integration (B2Bi) Trend.
• Trend Toward the Virtual Value Chain.
• Software as a Service Trend.
• Trend Toward Repackaging Expertise.
• Trend of System Integration Within Distributed
  Enterprise.

9
2. Introducing Web Services

• Problems with Existing Technologies
• Data Format.
• ASCII Comma-Delimited or Columnar-Delimited
  Files.
• Specific File Format.
• Data Transmission.
• Sneaker Net.
• File Transmission Protocol (FTP).
• What About Electronic Data Interface (EDI)?
• COM and CORBA/ORB/IIOP
• Existing Technologies Are Platform Specific.
• Existing Technologies Do Not Easily Integrate.
• Existing Technologies Pose Security Risks.

10
2. Introducing Web Services

• What is Needed?
• Integrate disparate distributed systems (faster,
  better, and cheaper) with legacy systems and
  without network security risks.
• Advantage if also
• Use existing technologies.
• Based on open standards.
• Guaranteed delivery of messages without expensive
  software.
• Humanly readable and understandable to facilitate
  debugging.

11
2. Introducing Web Services

• SOAP An Integration Solution
• What is SOAP?
• SOAP is platform independent.
• SOAP is easy to integrate into disparate systems.
• SOAP poses fewer security risks.
• Relationship Between SOAP and Web Services
• Scenario 1 A Simple Web Service for an Auto
  Parts Distributor.
• Scenario 2 Auto Parts Revisited
• Scenario 3 Futuristic Web Service.
• Read pages 15-18.

12
2. Introducing Web Services

• Relationship Between SOAP and Web Services
• What Is WSDL?
• Web Services Description Language - an XML
  document that describes the programmatic
  interfaces of your Web Surface. Visual Studio.NET
  automates the creation of WSDL files.
• What Is DISCO?
• Discovery of Web Services a file that contains
  the URI of each Web Service available on the
  server. The URI typically point to the WSDL
  document, which then points to the actual Web
  Service.
• What Is UDDI?
• Universal Description, Discovery, and Integration
  a search engine for Web Services, a meeting
  place for companies to do electronic business,
  and a directory for the world and within
  enterprises.

13
2. Introducing Web Services

• Microsofts Implementation of SOAP and Web
  Services
• Many SOAP implementations using different
  programming languages and operating systems.
• Soon almost every product will use SOAP in some
  fashion, including Microsoft Office (see section
  8).
• Three Microsoft implementations so far
• SOAP Toolkit for Visual Studio
• Spring 2000 - a premier technology for
  developers.
• Summer 2000 - a new toolset was needed.
• .NET Remoting
• Late Summer 2000 part of initial release of
  SDK.NET.
• Still a powerful tool when you need the
  availability and load balancing of distributed
  applications.
• ASP.NET Web Services
• Late Summer 2000 easy develop SOAP-based
  applications in the spirit of ASP, but with no
  visual component just XML formatted to comply
  with the SOAP specification.

14
2. Introducing Web Services

• The Benefits of ASP.NET Web Services
• Simple to Build
• Concentrate on the business rules instead of the
  technical details of sending and receiving SOAP
  messages.
• Simple to Test
• Simple test harness (Web Services test page)
  allows you to call the Web Service and see the
  result.
• Also describes all the information you need to
  integrate Web Services into your application.
• Simple to Deploy
• Registration of components is not required.
  Visual Studio.NET has tools that make this
  process easy.

15
2. Introducing Web Services

• How ASP.NET Web Services Differ from BizTalk
• What is BizTalk?
• A multipurpose technology that includes a
  repository of schema documents which define how
  industries can exchange information using the
  same structure.
• Software that allows a company to send and
  receive these documents with its trading
  partners.
• A mapping (Mapper) feature that enables data
  elements to be mapped from one document to
  another if companies have different schemas for
  how they exchange data.
• Software (Orchestrator) that orchestrates
  business processes and rapidly aggregate multiple
  Web Services calls (SOAP).
• Workflow or process designer (Visio).
• BizTalk sits at a higher level in the Web
  Services protocol stack than does ASP.NET Web
  Services.
• Hides the plumbing code of tying Web Services,
  COM (Component Object Model) objects, and script
  together so you can concentrate on writing the
  objects Orchestrator uses to fulfill a business
  process.

16
Web Services protocol stack
SOAP
Message
Interface
WSDL
Schema
XSD
Data
XML
Transport
HTTP
17
2. Introducing Web Services

• ASP.NET Web Services Are Implemented Using
  ASP.NET
• The next generation of Active Server Pages the
  premier way to create Web pages.
• Sits on top of the .NET Framework.
• Cannot use VBScript to create ASP.NET Web pages.
• Must use a language support by the .NET
  Framework
• Visual Basic.NET, C, Managed C, or
  JScript.NET.
• The Web page is compiled into a DDL (dynamic
  linked library).
• An Intermediate Language (IL) DLL that runs on
  top of the Common Language Runtime (CLR).
• No longer script files that are interpreted and
  run inside an ISAPI filter (Internet Server
  Application Programming Interface).

18
ASP.NET and the .NET Framework
ASP.NET
Windows Forms
Web Forms
Web Services
Services Framework
Classes
Tools
Common Language Runtime
Operating System Services
19
2. Introducing Web Services

• Where Do Web Services Fit Into Your
  Architecture?
• Initially thought of as purely a middle-tier
  service
• Tiers 1 Data access, 2 Middle-tier, and 3
  Presentation.
• The Web Service returns data to the server, and
  the server integrates the data into the visual
  interface (Web page), and delivers the content to
  the client (a Web browser).
• Server-to-server
• The client Web browser requests a page from a Web
  server that is actually a portal page that makes
  calls to other servers that provide Web Services
  (e.g., NXT 3 from NextPage).
• Server to client hosted .NET Framework
• Microsoft Office XP and SQL Server will host code
  that calls and processes the results of Web
  Services (see Section 8).

20
Web Services on the Middle Tier Now Web
Services reside in the cloud of the Internet.
Business Tier In Web Service
Data
Internet
Consumes Web Services
Client Browser
Web Server
21
Web Services on the Client Computers Next
Microsoft Server
MS Office XP Web Service
Internet
MS Office XP Client
Client PC Running MS Office XP
.NET Framework
22
Web Services on the Data Access Tier Next
Microsoft SQL Server
.NET Framework
Web Service
Web Service Hosted on SQL Server
Internet
Client Application/ Browser/Server
23
2. Introducing Web Services

• Selecting a Language
• ASP.NET supports
• Visual Basic.Net, Managed C, and C.
• Visual Basic.Net and C are simpler than C.
• Microsoft will supply a JScript compiler.
• Regardless of code, they are all reduced to a
  common denominator the Intermediate Language.
• Selecting a Code Editor
• Visual Studio.NET helps speed development by
  automating development tasks.
• Inexpensive text editors UltraEdit or EditPlus.

24
2. Introducing Web Services

• Summary
• SOAP is a technology that uses industry-accepted
  standards (HTTP and XML) to allow two or more
  disparate systems to communicate across the
  network.
• Microsofts implementation of SOAP to quickly
  create applications (ASP.NET Web Services)
  provides improved performance, better security,
  and excellent maintainability.
• Web Services have been most frequently associated
  with the middle-tier of a distributed n-tier
  architecture, but could become ubiquitous on the
  presentation and data access layers, too.
• Web Services can be created using any language
  supported by the .NET Framework and with a simple
  text editor, but Visual Studio.NET offers higher
  productivity.
• Learn how to create and consume simple Web
  Services using the .NET Framework and the Visual
  Studio.Net Integrated Development Environment
  (IDE).

25
3. Creating a Simple Web Service with .NET SDK

• Contents
• What Will Your Web Service Do?
• Setting Up the Environment.
• Testing the Web Service.
• Creating the Web Service Description Language
  (WSDL) File.

26
3. Creating a Simple Web Service with .NET SDK

• What Will Your Web Service Do?

27
3. Creating a Simple Web Service with .NET SDK

• Setting Up the Environment

28
3. Creating a Simple Web Service with .NET SDK

• Testing the Web Service

29
3. Creating a Simple Web Service with .NET SDK

• Creating the Web Service Description Language
  (WSDL) File

30
4. Consuming a Simple Web Service with .NET SDK

• Contents
• How to Consume a Web Service.
• Creating the Web Service Consumer.
• Testing the Web Service Consumer.

31
4. Consuming a Simple Web Service with .NET SDK

• How to Consume a Web Service

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4. Consuming a Simple Web Service with .NET SDK

• Creating the Web Service Consumer

33
4. Consuming a Simple Web Service with .NET SDK

• Testing the Web Service Consumer

34
5. Creating a Simple Web Service in Visual Studio
.NET

• Contents
• Creating a New Visual Studio.NET Web Services
  Project.
• Reviewing Visual Studio.NETs Advantages.

35
5. Creating a Simple Web Service in Visual Studio
.NET

• Creating a New Visual Studio.NET Web Services
  Project

36
5. Creating a Simple Web Service in Visual Studio
.NET

• Reviewing Visual Studio.NETs Advantages

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38
6. Consuming a Web Service in Visual Studio .NET

• Contents
• Creating a Web Forms Application.
• Reviewing Visual Studio.NETs Advantages.

39
6. Consuming a Web Service in Visual Studio .NET

• Creating a Web Forms Application

40
6. Consuming a Web Service in Visual Studio .NET

• Reviewing Visual Studio.NETs Advantages

41
7. Three Methods of Calling Web Services

• Contents
• Web Service Help Page and HTTP-GET.
• Calling a Web Service Using HTTP GET.
• Calling a Web Service Using HTTP POST.
• Using the MSXML XMLHTTP Object.

42
7. Three Methods of Calling Web Services

• Web Service Help Page and HTTP-GET

43
7. Three Methods of Calling Web Services

• Calling a Web Service Using HTTP GET

44
7. Three Methods of Calling Web Services

• Calling a Web Service Using HTTP POST

45
7. Three Methods of Calling Web Services

• Using the MSXML XMLHTTP Object

46
8. Consuming Web Services in Office XP

• Contents
• The Office Web Service Example.

47
8. Consuming Web Services in Office XP

• The Office Web Service Example

48
9. Microsoft .NET Resources

• Subscribe to MSDN (Microsoft Developers Network)
• http//msdn.microsoft.com/subscriptions
• .NET Developer Career Skills Raodmap
• http//www.microsoft.com/netdevroadmap/
• Microsoft Certified Training Centers
• 6 XML and 12 .NET classes (1-5 days).
• Local events
• http//www.microsoft.com/usa/midatlantic/calendar.
  asp
• Presentations
• http//www.microsoft.com/usa/presentations/search.
  asp?districtmidatlantic
• See Visual Basic.NET Upgrade Guide
• http//msdn.microsoft.com/vbasic/technical/upgrade
  /guide.asp

49
9. Microsoft .NET Resources

• .NET Developer Training Tour
• Module 1. What is Microsoft .NET?
• An overview of what .NET is and why/how it is
  significant. This section introduces the big
  picture for .NET and how it came to be.
• Module 2. The .NET Framework
• Introduces the .NET Framework and its major
  features the Common Language Runtime, CLR, and
  Multi-language support. Introduce the concepts of
  the framework, the Uniform Class Libraries and
  the major classes it provides. Discuss what
  assemblies are and how they fit into the picture.
  
• Module 3. Visual Studio .NET
• Introduce major features of VS.NET, the
  integrated development environment, the Modelers,
  automation and run time features such as forms
  and wizards. Show how to use the major features
  such as the creation of an application, using the
  toolbox, using server explorer, and other
  features from a high level.
• Module 4. The .NET Languages
• The .NET Framework is language neutral this
  makes all code modules reusable allowing
  developers to use the right language for the job
  at hand. The module focuses on the new features
  provided by the .NET Framework such Namespaces
  and Attributes, Interoperability and changes that
  make coding easier in .NET. Examples are given in
  VB .NET to show that VB .NET is still VB and the
  developer's skills are upwardly mobile into .NET.
  
• Module 5. Building ASP .NET Applications
• This module introduces ASP .NET and Web Forms. It
  shows how to create and build the initial part of
  the web application. It also shows what user
  controls are and gives a demo of how they are
  built.

50
9. Microsoft .NET Resources

• .NET Developer Training Tour (continued)
• Module 6. Using Data Access in .NET Applications
• This module shows what ADO .NET is and how it
  works. There will be implicit comparisons to ADO
  and developers will see how to accomplish the
  same tasks they did in ADO with ADO .NET.
• Module 7. Building Reusable Middle Tier
  Components
• This module shows developers how to create middle
  tier components for use in their applications.
  The module demonstrates a common data layer
  component that can be used in any application.
  The module also shows how to create a business
  layer component that uses the data component. The
  module shows how to use the RAD server features
  to create data parts of middle tier and layer in
  business logic.
• Module 8. Creating Windows Applications
• This module demonstrates how to create Windows
  applications. The Windows applications rely on
  Windows Forms and are connected to the database
  used in other parts of the sample application.
• Module 9. Using XML in .NET XML Designer
• Features, XML and ADO.NET - data access, XML in
  remoting and System.XML.
• Module 10. Creating XML Web Services
• What are XML web services? This module shows what
  XML web services are, how to create and consume
  them, and discusses how Web services integrate
  with UDDI.

51
9. Microsoft .NET Resources

• .NET Developer Training Tour (continued)
• Module 11. Making Your Application Scalable and
  Reliable
• This module shows how to use server RAD features
  and incorporate those into applications. This
  Module also shows how the .NET Framework provides
  these features and makes it easy to add them to
  apps with little or no coding.
• Module 12. Security in .NET
• This module introduces the developer to the new
  security features in .NET. The developer will see
  practical examples of how those security features
  are woven into an application as the application
  goes through the development process.
• Module 13. Configuring and Deploying .NET
  Applications
• This module covers the configuration and
  deployment options for a .NET application.
  Developers will see how to configure the
  application and learn about various ways of
  deploying it.
• Module 14. Application Interoperability
• This module shows how to integrate legacy COM
  components into a .NET application and discusses
  interoperability with legacy applications.
• Module 15. Migrating Applications to .NET
• This module discusses how to migrate legacy
  applications to .NET. Topics include a strategy
  to selecting applications that are good
  candidates for migration, a discussion of the
  tasks, potential problems, and benefits of
  migrating existing applications to .NET.
• Module 16. Building Applications for Mobile
  Devices
• This module describes what mobile devices are and
  discusses what mobile standards such as CF, MIT,
  WML are. It shows how these standards are part of
  .NET.

52
10. Appendix Visual Studio.NetInstallation and
Help

• Installation
• Defrag hard drive before.
• 1.62 GB and about one hour.
• Options (see next slide)
• View ReadMe file.
• Windows Component Update.
• Visual Studio.NET.
• Service Releases (none now until public launch).
• Public Launch in February 2002
• Free Trial Edition DVD.

53
10. Appendix Visual Studio.NetInstallation and
Help
54
10. Appendix Visual Studio.NetInstallation and
Help
55
10. Appendix Visual Studio.NetInstallation and
Help
56
10. Appendix Visual Studio.NetInstallation and
Help

• Help
• .NET Framework SDK Documentation.
• .NET Framework SDK.
• .NET Framework SDK QuickStarts, Tutorials and
  Samples.
• .NET Framework Tools.
• Visual Studio .NET Combined Collection.
• Visual Studio My Profile and XML Web Services.
• Visual Studio New Project.

57
.NET Framework SDK Documentation
58
.NET Framework SDK
59
.NET Framework SDK QuickStarts, Tutorials and
Samples
60
.NET Framework Tools
61
Visual Studio .NET Combined Collection
62
Visual Studio My Profile and XML Web Services
63
Visual Studio New Project