Introduction to ASP NET Yingcai Xiao Approach Get

Introduction to ASP. NET Yingcai Xiao

Approach • Get the BIG picture before programming • “Why? ” then “How? ” • Principles and practices: know the concepts and know how to design and implement an application. • In the industry: design then coding

What is a Computer? From the Webster’s New World Dictionary: 1. A person who computes. 2. A device used for computing (an electronic machine which by means of stored instructions and information, perform rapid, often complex calculations or compiles, correlates, and selects data).

What is a program and what is programming? Programs: stored computer instructions for data processing. Programming = Data Structures + Algorithms Professor Donald E. Knuth

What Types of Programs? (1) Stand Alone: MS Power. Point (2) Web/Internet-based: (a) Client-side: client-side Java. Script (b) Server Side: ASP. NET, JSP, Web Services 3 -Tir Enterprise Applications (c) Both-sides: Apps (3) Cloud: Applications on the Cloud. Everything is on the Internet and the Internet is “a’ huge computer. Why? Code Reuse!

Traditional Compilation/Linking (C/C++) Source Code for Language 1 Compiler on OS 1 Language 1 Compiler on OS 2 Binary Code for OS 1 Binary Code for OS 2 OS 1 OS 2

Common Binary Code?

Java Intermediate Language: Java Bytecode Java Source Code (. java) Java Compiler (javac) on OS 1 Java Compiler (javac) on OS 2 Java Bytecode (. class) Java Interpreter on OS 1 (java) Java Interpreter on OS 2 (java) Binary Code for OS 1 Binary Code for OS 2 OS 1 OS 2 Program statements are interpreted one at a time during the run-time.

JIT Compiler An interpreter interprets intermediate code one line at a time. Slow execution. A JIT (Just-In-Time) Compiler compiles the complete code all at once just into native binary code before execution. Faster execution.

JIT Complier: Java Bytecode Compiler Java Source Code (. java) Java Compiler (javac) on OS 1 Java Compiler (javac) on OS 2 Java Bytecode (. class) Java JIT Compiler on OS 1 Java JIT Compiler on OS 2 Binary Code for OS 1 Binary Code for OS 2 OS 1 OS 2 All programming statements are compiled at compile time.

OS-Independent Code: Intermediate Languages The trend to support OS-independent binary code is to compile the source code into the binary format of an intermediate language. And to provide an interpreter for the intermediate language on each OS to translate the binary code of the intermediate language into the native binary code of the OS.

OS-Independent Compilation: Intermediate Language Source Code for Language 1 Compiler on OS 1 Language 1 Compiler on OS 2 Intermediate Binary Code Intermediate Code Interpreter OS 1 Intermediate Code Interpreter OS 2 Binary Code for OS 1 Binary Code for OS 2 OS 1 OS 2

MSIL: Microsoft Intermediate Language Source Code for Language 1 Compiler on OS 1 Language 1 Compiler on OS 2 MSIL Code MSIL JIT Compiler on OS 1 MSIL JIT Compiler on OS 2 Binary Code for OS 1 Binary Code for OS 2 OS 1 OS 2 . NET OS-Platform-Independence

The Programming Language for. NET: C# C#: (0) C^+^2 n; n = 0, 1, 2, => C, C++, C# (1) The most advanced programming language to date (3) OOP (Object-oriented Programming) (4) EDP (Event Driven Programming) (5) Dynamic type generation (6) Platform-independent? : Code runs on any platform with. NET runtime (7) Visual Studio

A Common Language?

. NET Common Language Runtime To make. NET language independent, CLR (Common Language Runtime) is defined as the runtime environment. CLR defines CTS (Common Type System) which should be followed by all languages to be used in the. NET framework. Syntax: int, for, . . Semantics: multiple inheritance is not allowed in CTS The code that follows CTS standard is called managed code. regular C++ supports multiple inheritance managed C++ does not support multiple inheritance

CLR: Common Language Runtime Source Code for Language 1 Source Code for Language 2 Language 1 Compiler on OS 1 Language 2 Compiler on OS 2 MSIL Code Confirming CTS (Managed Code) CLR on OS 1 CLR on OS 2 Binary Code for OS 1 Binary Code for OS 2 OS 1 OS 2 . NET Language-Independence

. NET Architecture for Language and Platform Independence (fan-in and fan-out on MSIL) Source Code for Language 1 Source Code for Language 2 Language 1 Compiler on OS 1 Language 2 Compiler on OS 2 MSIL Code Confirming CTS (Managed Code) CLR on OS 1 CLR on OS 2 Binary Code for OS 1 Binary Code for OS 2 OS 1 OS 2

CLI (Common Language Infrastructure) CLR/CTS for Everyone?

CLI : Common Language Infrastructure A specification defines an environment for multiple high-level languages to be used on different computer platforms. Created by Microsoft based on. NET, standardized by MS, Intel, HP and others, ratified by ECMA and ISO. . NET is an implementation of CLI for desktop systems. . NET Compact Framework is an implementation of CLI for portable devices. Open Source implementations: Mono development platform (Novell), Portable. NET (dot. GNU)

CLI (Common Language Infrastructure) Specification Open Architecture for Language and Platform Independent Programming Source Code for Language 1 Source Code for Language 2 Language 1 Compiler on OS 1 Language 2 Compiler on OS 2 CIL (Common Intermediate Language) Code Confirming CTS (Common Type System) CLR for OS 1 CLR for OS 2 Binary Code for OS 1 Binary Code for OS 2 OS 1 OS 2

Even though, CLI/CTS/CLR can make a program written in any language to run on any platform, the entire program (including all libraries used) has to be on the platform before running. Can we have part of a program on one computer and another part of the same program on another computer? Distributed Computing. A program is divided into multiple parts and different parts are distribute on different computers. e. g. virtual surgery.

Web Enabled & Distributed. NET

What is. NET? . Net is a framework for developing OSplatform-independent, programminglanguage-independent, web-enabled, distributed applications.

. Net is Web-enabled and Distributed To run distributed code on the web, we need a standard way to register the code and a standard way to access the code. Registration: UDDI Registry: Universal Description, Discovery, and Integration. Access: SOAP: Simple Object Access Protocol WSDL: Web Service Description Language

. NET Architecture for Web-based Distributed Computing Client 1 UDDI Registry 2 SOAP Client 2 Web Service 1 UDDI Registry 1 WSDL Interface 1 Web Service 2 WEB SOAP WSDL Interface 2

. NET Framework Composition http: //en. wikipedia. org/wiki/. NET_Framework

. NET Framework Compositions Common Language Runtime (CLR ): provides the runtime environment for MSIL code. Framework Class Library (FCL) : provides standard libraries for developing common. Net applications. . NET runtime environment comes with Windows. NET development environment comes with Visual Studio

. NET Application Types Web Services Browser Local Distributed Accessible Applications Remote Applications (Windows Forms or Console Applications) (ASP. NET) . Net Framework Class Library Common Language Runtime OS Other Applications (Mobile, …)

. Net Framework Class Library System Windows Web Data (Database) Forms (GUI) UI Services Enterprise Services XML String, (Data Description) … Connection Data. Set Xml. Document Language Integrated Query, Windows Presentation Foundation, Windows Communication Foundation, …

. NET Enterprise Servers Internet Information Services (IIS): web server Commerce Server: e-commerce server SQL Server: database server Exchange Server: MS exchange services Mobile Information Server: wireless server Internet Security and Acceleration (ISA) Server: firewall, proxy, … Biz. Talk: B 2 B (Business-to-Business) server

History: . Net & COM : Code Reuse MFC: Microsoft Foundation Class, code reuse within an application (process) COM: Component Object Model, code reuse across applications (processes) DCOM: Distributed COM, code reuse across systems COM+: Internet-based Enterprise COM, code reuse across the Internet. NET: COM+ 2. 0, all COM+ services are available in. NET, even those not in managed code, interoperable with COM-based applications

Versions of. NET. Net is evolving. 1. 0: fundamentals CLR, FCL 2. 0: http: //forums. asp. net/t/1115522. aspx partial classes, profile object, ACL 3. 0: http: //forums. asp. net/t/1115522. aspx WCF (Communication), WWF (Workflow), WPF (Presentation) 4. 0: http: //msdn. microsoft. com/enus/library/ms 171868. aspx DLR (dynamic language runtime) improved security model parallel processing (PLINQ)

Versions of. NET 4. 5: (2012) UWP (Universal Windows Platform) https: //en. wikipedia. org/wiki/Universal_Windows_Platform. NET Core: (2016) free and open-source, cross-platform

http: //en. wikipedia. org/wiki/. NET_Framework

Latest. NET Framework http: //msdn. microsoft. com/enus/vstudio/aa 496123 Current version: framework 4. 5 (08/2012) Framework 4. 5. ARM (Advanced RISC Machine) support in 4. 5 on Windows 8 in addition to x 86 SIMD (single instruction, multiple data), multi and many core processors (GPUs). Some support through Direct 3 D. No support yet for SSE (Streaming SIMD Extensions to x 86)

A Common Language for the Internet (free of compilation and translation)?

A Common Language for the Internet • • Tim Berners-Lee ASCII text (ISO/IEC 8859 -1) is platform-independent. HTTP (Hyper Text Transport Protocol) e. g. GET wp. html Assembly Language for the Internet HTML (Hyper Text Markup Language) High-level language for the Internet) hyper text: text that describes other text tags: type definition of text in text <title>WP</title> all tags are predefined in HTML only system defined types, no user defined types Recognizable by all types of computers. (World Wide Web)

A Common Language for the Internet ÞXML (e. Xtensible Markup Language) Allow user defined tags (types) ÞSOAP (Simple Object Access Protocol) Standards for defining objects for the Internet Based on XML ÞWSDL (Web Service Description Language) Standards for describing web services for the Internet Based on XML

Textbooks and References Textbooks: Programming Microsoft. NET, Jeff Prosise, Microsoft Press http: //www. amazon. com/Programming-Microsoft%C 2%AE-NET-Core-reference/dp/0735613761 In Safari (free online read for UA students through VPN) http: //proquest. safaribooksonline. com/book/programming/microsoft-dotnet/0735613761/firstchapter Pro C# 2010 and. NET 4 Platform, Andrew Troelsen, Apress http: //www. amazon. com/2010 -NET-Platform-Andrew-Troelsen/dp/1430225491/ref=pd_sim_b_3 In Safari (free online read for UA students through VPN) http: //proquest. safaribooksonline. com/book/programming/csharp/9781430225492

Textbooks and References Reference Books: Professional C# 4 and. NET 4, Christian Nagel, et. al. , Wrox Professional C#, Simon Robinson, et. al. , Wrox Microsoft. NET for Programmers, Fergal Grimes, Manning Programming C#: Building. NET Applications with C#, Jesse Liberty, O’Reilly For Beginners: C# Concisely, Bishop & Horspool, Pearson / Addison Wesley Beginning C# Objects from Concepts to Code, Barker and Palmer, Apress Microsoft Visual C#. NET Step by Step, John Sharp, Microsoft Press Visual C#2010, Deitel & Deitel Understanding. NET, David Chappell, Pearson / Addison Wesley