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Microsoft .NET (dotnet) Framework 2003 - 2004 overview and web services…

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C# in its early days...

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Microsoft .NET (dotnet) Framework 2003 - 2004 overview and web services…

  1. 1. Microsoft .NETFramework Overview Lorenz Sauer Jun 2004 / HTLW16
  2. 2. What is .NET?• Microsoft’s “vision” or marketing strategy, as well as new technologies• A brand applied to a new technology• Most significant new technologies – Common Language Runtime (CLR) – Common Language Infrastructure (CLI) – Web Services• Dawn of a new era of computing?
  3. 3. Benefits• Better integration of web services• Platform, that is OS independent• Language independence – Programming in your choice of language• Sophisticated Base layer, - the “framework“• Improves reliability, scalability, performance, and security
  4. 4. The .NET Framework• Windows “Standard” .NET Framework• Embedded Compact .NET Framework• .NET Framework class library• Common Language Runtime (CLR)
  5. 5. Framework Principle .NET Framework Applications Platform Specific Class Libs Base Class Libs Execution Engine (MSCOREE.DLL) Platform Adaptation Layer Host Operating System
  6. 6. Framework Blueprint .NET Framework.Net Compliant Language Windows Forms, (VC, VB.NET, ASP.NET, Web Forms, C#, JS.NET, J# Web Services others 3rd party) .NET Framework Base Classes (ADO.NET, XML, Threading, Diagnostics, IO, Net, Secutity etc. Common Language Runtime (Memory Management, Common Type System, Lifecycle Monitoring)
  7. 7. The .NET Class Library• Object-oriented collection of reusable classes• “System” namespace – All Framework classes• Accessible by a .NET language• Includes: – Database, rendering, file access & IO, diagnostics, object collections – Security, Reflection, Threading and Eventing
  8. 8. The .NET Class Library• Some Core types: – Char – Boolean – Int16 – Array• Also: – Console – Math – GC (Garbage Collection)
  9. 9. Common Language Runtime (CLR)• Manages memory• Thread execution• Code execution• Type safety verification• Lifespan / Lifetime Management• Compilation (Just In-time Compiler)
  10. 10. Common Language Infrastructure (CLI)• Subset of the CLR submitted to ECMA standards organization• Submitted for standardization: – C# – Semantics for metadata – Microsoft Intermediate Language (MSIL) – Parts of the .NET framework class library
  11. 11. Common Type System (CTS)• A single type system shared by compilers, tools and the CLR• Common type support for different languages• Types – Reference (heap allocation) – Value (stack allocation)
  12. 12. Common Language Specification (CLS)• Comprises a subset of CTS• A programming language must support CLS – For compliance with the .NET Framework• Contract: – between language designers and the .NET Framework
  13. 13. Managed Code• Software written for the CLR is referred to as managed code• Most significant concepts in managed code: – Assemblies – Microsoft Intermediate Language (MSIL)
  14. 14. Assemblies• code libraries compiled for CLR• make up a logical unit of functionality• Eases deployment, versioning and security.• A scheme for organizing code compiled for the CLR• Manifest describes dependencies, versions, scope• Contains Microsoft Intermediate Language (MSIL)
  15. 15. The Microsoft Intermediate Language (MSIL)• Intermediate code that runs in the CLR• Not a machine specific binary but an intermediate machine code representation• Must be converted by a .NET Framework: – just-in-time (JIT) compiler translates to native code
  16. 16. MSIL Tools• MSIL Assembler (Ilasm.exe) – Generates executable from MSIL• MSIL Disassembler (Ildasm.exe) – Creates MSIL code from executable• Native Image Generator Tool (Ngen.exe) – Compiles MSIL to machine code in lieu of JIT compiler
  17. 17. MSIL “Hello World”• Assembler directives begin with a period• MSIL Instructions lines: 8, 9 and 101. /* this is an MSIL comment */2. .assembly extern mscorlib {}3. .assembly hello {}4. .method static public void main() il managed5. {6. .entrypoint7. .maxstack 18. ldstr "Hello world!"9. call void [mscorlib]System.Console::WriteLine(class System.String)10. ret11. }
  18. 18. .NET Languages• The CLR was designed to support multiple languages: – C# – VB – C++ – J# – -…
  19. 19. C#• Fully tailored to .NET• Twice as comprehensive as of C++• C++ scope available via virtual declaration• Powerful COM-InterOp• Programmer decides when to use Managed Envionment and when not: – Shallow learning curve
  20. 20. Web Technologies• The .Net XML Web services are distributed, server- side applications• XML Web services built on industry standards – XML – WSDL – SOAP – UDDI – WSDL
  21. 21. XML• XML provides a way to describe information in a structured format• Tag based <….> content </…>• Attributes, values, rules…• Document trees and hierarchies via “nesting”• Supported by the World Wide Web Consortium (W3C)
  22. 22. WSDL• XML based language used to define Web services interfaces• Similar to IDL for COM and CORBA (Common Object Request Broker Architecture)
  23. 23. SOAP• Provides an XML envelope for data exchange in distributed networks• Message consists of three parts: – Envelope that defines a framework for describing what is in a message and how to process it – Encoding rules for expressing instances of application- defined data types – Convention for representing remote procedure calls (RPCs) and responses
  24. 24. UDDI• Umbrella organization of businesses• Goal: expose web services through a registry• The Registry is itself a web service – provides information about other web services – provides information about integration
  25. 25. Open Standards• CLI, C# submitted to ECMA standards organization• Open source implementations of the .NET Development Framework and C# – Mono project by Ximian – The GNU open source organization
  26. 26. Resources •Based upon: Eric Landry, Microsoft .NETFramework Overview, A Presentation •UDDI Homepage •http://www.uddi.org/ •EMCA filing of CLI and C# •http://www.ecma.ch/ecma1/STAND/ecma-335.htm
  27. 27. Resources•The Mono Project homepage•http://www.go-mono.com/•The dotGNU Homepage•http://www.dotgnu.org•Microsoft’s .NET Homepage•http://www.microsoft.com/net/

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