Platforms and tools for Web Services and Mobile Applications Introduction to.Net Bent Thomsen Aalborg University 3rd and 4th of June 2004

Microsoft.NET Web services support across the Microsoft platform ToolsClientsServices Servers Experiences & Solutions

A Unified Programming Model Windows API.NET Framework Consistent API availability regardless of language and programming model ASP Stateless, code embedded in HTML pages MFC/ATL Subclassing, Power and Expressiveness VB Object Model RAD, Composition and Delegation

Visual Studio.NET and the.NET Framework Windows Operating System Common Language Runtime Base Class Library ADO.NET and XML ASP.NET Web Forms Web Services Mobile Internet Toolkit WindowsForms Common Language Specification VBC++C#J#… Visual Studio.NET

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

CLR: Internals Class Loader IL to Native Compilers Code Manager Garbage Collector Security EngineDebug EngineType CheckerException ManagerThread SupportCOM Marshaler Base Class Library Support

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

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….Net Framework Classes Unified and Comprehensive API

System System.Data (ADO.NET)System.XML System.Web (ASP.NET) Globalization Diagnostics Configuration Collections Resources Reflection Net IO Threading Text ServiceProcess Security Design ADO SQLTypes SQL XPath XSLT Runtime InteropServices Remoting Serialization ConfigurationSessionState CachingSecurity Services Description Discovery Protocols UI HTMLControls WebControls System.Drawing Imaging Drawing2D Text Printing System.WinForms DesignComponentModel.Net Framework Classes

Referencing the Framework

11 Source Code C++, C#, VB or any.NET language csc.exe or vbc.exe Compiler Assembly DLL or EXE.Net Assemblies Compilation

VB Source code Compiler C++C# CompilerCompiler Operating System Services Common Language Runtime JIT Compiler Native Code Managedcode Assembly IL Code Assembly Assembly.Net Execution Model Common Language Runtime

.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

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

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

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 >20 other languages Protection of existing investments –Use java language syntax on.NET –Move applications and skills forward

Visual C++.NET Continue 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

.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…

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

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

Web Services Open Standards & Protocols XML –Universal data format –Standards-based integration –User-customizable HTTP –Ubiquitous protocol –Universally understood

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

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 Software as a Service Visual Studio.Net and the Net Framework Public Function HelloWorld() as String return “Hello World” End Function [WebMethod] WSDL Web Service Object Test Page Compiler

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

.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

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