Platforms and tools for Web Services and Mobile Applications Introduction to .Net

1
Platforms and tools for Web Services and Mobile
ApplicationsIntroduction to .Net

• Bent Thomsen
• Aalborg University
• 3rd and 4th of June 2004

2
Microsoft .NET
Web services support across the Microsoft
platform
3
A Unified Programming Model
4
Visual Studio .NET and the .NET Framework
Visual Studio .NET
Common Language Runtime
Windows Operating System
5
Common Language Runtime

• Manages running code
• Threading, Memory management
• Eliminates memory management drudgery
• Kills entire classes of bugs (e.g., memory
  corruption, ref counting)
• Auto-versioning, no more DLL Hell
• Scalability, performance, reliability all improve
• Fine-grained evidence-based security
• Code access Role-based
• Integrated with underlying OS
• Security model ensures safety
• No-touch deployment
• XCOPY, no registry required
• Object remoting with SOAP

6
CLR Internals
Base Class Library Support
Class Loader
7
Framework Classes

• Spans all programming languages
• Enables cross language inheritance and debugging
• Integrates well with tools
• Object-oriented and consistent
• Increases developer productivity by reducing the
  number of APIs to learn
• Common type system built-in
• Extensible
• Makes it easy to add or modify framework features
• Secure
• Allows creation of secure applications

8
.Net Framework ClassesUnified and Comprehensive
API

• System Runtime Functions
• Windows Web Development
• Web Services
• Data Access XML Services
• Networking IO
• Enterprise Services (COM MSMQ)
• Directory Security Services
• Diagnostics, Perf-Mon, Debug
• And many more

9
.Net Framework Classes
10
Referencing the Framework
11
.Net AssembliesCompilation
Source Code
C, C, VB or any .NET language
12
.Net Execution ModelCommon Language Runtime
Source code
VB
C
C
Compiler
Compiler
Compiler
Managed code
Common Language Runtime
JIT Compiler
Native Code
Operating System Services
13
.NET Security

• Role-based Security
• What the user is allowed to do within the
  application
• .NET Roles Windows Active Directory groups
• Code Access Security
• What the code is allowed to do on this machine
• Evidence Based (Policies, Permissions, Evidence)
• Cryptography Built In to .NET FX

14
Visual Basic .NET

• Evolution, not revolution, of language used by
  developers worldwide
• Builds on existing technology while adding power
• True OOP
• Multithreading
• NT Services
• Web Services
• The fastest way to build scalable applications
  for industry

15
Visual C .NET Component Oriented Language

• C is the first component oriented language in
  the C/C family
• Component concepts are first class
• Properties, methods, events
• Design-time and run-time attributes
• Integrated documentation using XML
• Enables one-stop programming
• No header files, IDL, etc.
• C heritage simplification with no unnecessary
  sacrifices

16
Visual J .NET

• Native support for XML Web services
• Fully integrated with Visual Studio .NET
  development environment
• Full access to the .NET Framework
• ASP.NET, ADO.NET, Windows Forms
• Integration with gt20 other languages
• Protection of existing investments
• Use java language syntax on .NET
• Move applications and skills forward

17
Visual C .NETContinue to provide most powerful
and flexible language

• Better ANSI/ISO conformance
• Enable seamless, incremental use of .NET
  Framework
• Enhanced ATL Servers
• Improved ATL and MFC Clients
• Enhanced STL

18
.NET Applications

• Web Form Next Generation ASP Page
• Win Form Next Generation Win32 App
• Web Services Key to Interoperability
• Others
• Server Objects
• Console Applications
• Window Services
• Mobile Clients
• Many more

19
ASP.NET

• Server-side Web Forms and Web Services components
  separate code from content
• Developer productivity increases
• Tools easily use ASP.NET
• Any programming language full VB, JScript, C,
  COBOL, Perl, etc.
• 40 to 70 reduction in lines of code
• Compiled
• No-touch deployment system
• Intelligent state management
• Backwards compatible with ASP
• Controls sense client and adapt output HTML,
  DHTML, WML

20
What Is an XML Web Service?

• A Component That Uses XML HTTP To Define and
  Deliver A Service
• Global reach
• Based on open set of standards
• Reuse across platforms
• Works with any operating system, programming
  language, or network
• Expose legacy code
• Different systems can actually talk

21
Web ServicesOpen Standards Protocols

• XML
• Universal data format
• Standards-based integration
• User-customizable
• HTTP
• Ubiquitous protocol
• Universally understood

22
VS.NET and Web Services

• Expose functionality as service
• No need to learn XML, SOAP, or WSDL
• Interface is automatically generated
• Seamless deployment
• Reuse existing Web Services
• VS.NET generates the plumbing
• Full IntelliSense support
• Build and consume with any VS language

23
Software as a ServiceVisual Studio .Net and the
Net Framework

• Built-in Support for Developing and Consuming Web
  Services
• Based entirely on open standards
• Automatically generates WSDL
• Automatically provides test page
• Attribute based No heavy coding needed

WebMethod
Public Function HelloWorld() as String return
Hello World End Function
24
Windows Forms

• Rich, powerful client UI
• Control anchoring, visual inheritance
• Shared across all .NET languages
• No-touch deployment
• Secure
• Semi-trusted browser component
• Fully-trusted local application
• Full Web Service integration

25
.NET (R)Evolutionary

• Evolutionary
• Existing Skills Migrate Smoothly
• Interoperates with Existing Applications
• Extension of WinDNA Architecture
• Revolutionary
• Common Language Runtime
• Deployment / Versioning (Ends DLL Hell)
• Web Services XML Integration
• Evidence Base Code Access Security

26
5 Key Points to Remember

• Developers can use any .NET Language
• The .NET Framework provides a foundation of
  classes for developers to build a wide variety of
  applications
• Source code is compiled to MSIL within an
  Assembly
• Assembles contain rich meta data and are the
  primary units of deployment
• MSIL is compiled to native code and executed by
  the Common Language Runtime