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Introduction to .net FrameWork by QuontraSolutions
.NET is a platform-independent framework that provides a managed environment for application development, supporting multiple programming languages and improving memory management through its Common Language Runtime (CLR). It facilitates cross-language development via a Common Language Infrastructure (CLI) that ensures type safety and access to metadata. The framework integrates various technologies and libraries, enabling developers to create distributed applications with web, desktop, and mobile capabilities.
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Introduction to .net FrameWork by QuontraSolutions
- 1. By Email :info@quontrasolutions.co.uk Contact : 020-3734-1498 WebSite : www.quontrasolutions.co.uk
- 2. Before .NET WindowsGUI development: Win32 API, MFC, Visual Basic, COM Web development: ASP Java – “Write once, run anywhere.” Embrace and extend: Visual J++
- 3. Life As aC/Win32 API Programmer Traditional software development for the Windows. • C developers are forced to contend with complex memory management and pointer arithmetic. • It lacks the benefits provided by the object-oriented approach When you combine the thousands of global functions and data types defined by the Win32 API to an already formidable language, it is little wonder that there are so many buggy applications floating around today.
- 4. Life As aC++/MFC Programmer C++ is an object-oriented layer on top of C. Programmers benefit from the famed “pillars of OOP” (encapsulation, inheritance, and polymorphism). Microsoft Foundation Classes (MFC) provides a set of C++ classes that facilitate the construction of Win32 applications. It wraps a “sane subset” of the raw Win32 API behind a number of classes, magic macros, and numerous code-generation tools (wizards). Regardless of the helpful MFC, programming for Windows using C++ remains a difficult and error-prone experience
- 5. Visual Basic 6.0Programmer Ability to build complex user interfaces, code libraries, and data access logic with minimal fuss and bother. • VB6 hides the complexities of the raw Win32 API from view using integrated code wizards, intrinsic data types, classes, and VB-specific functions. Not fully object-oriented • No “is-a” relationships between types (i.e., no classical inheritance) • No multithreaded applications unless you are willing to drop down to low-level Win32 API calls (which is complex at best and dangerous at worst).
- 6. Life As aJava/J2EE Programmer Object oriented with syntactic roots in C++. • Java cleans up many unsavory syntactical aspects of C++. • Java provides programmers with a large number of predefined “packages” that contain various type definitions. Limited ability to access non-Java APIs. Little support for true cross-language integration. • Not appropriate for many graphically or numerically intensive applications. • A better approach for such programs would be to use a language such as C++ where appropriate.
- 7. Life As aCOM Programmer Microsoft’s previous application development framework. • reusable binary code. • C++ programmers can build COM classes that can be used by VB6. Delphi programmers can use COM classes built using C. COM’s language independence is limited. • COM has no support for classical inheritance). COM is extremely complex under the hood. • The Active Template Library (ATL) provides a set of C++ classes, templates, and macros to ease the creation of COM types.
- 8. Windows DNA Programmer Microsoft has been adding more Internet-aware features into its family of operating systems and products. COM-based Windows Distributed interNet Applications Architecture (DNA) is quite complex. Due to the simple fact that Windows DNA requires the use of numerous technologies and languages (ASP, HTML, XML, JavaScript, VBScript, COM(+), and data access API like ADO).
- 9. The complete maze… Completely unrelated syntaxes. JavaScript has a syntax much like C, while VBScript is a subset of VB6. The result is a highly confused mishmash of technologies. Each language and/or technology has its own type system: An “int” in JavaScript is not quite the same as an “Integer” in VB6.
- 10. .Net, the Rescuer OOP JVM .NET GUI Web component-based design n-tier design
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- 12. Integrated environment .Netprovides Internet, Desktop , Mobile devices consistent object-oriented To provide a portable environment A managed environment
- 13. .NET is aframework What Is .NET New programming methodology .NET is platform independent / cross platform .NET is language-insensitive
- 14. .NET is cross-platform APP.exe ? Win64 Win32 (XP,2K,98) WinCE
- 15. Narrow view of.Net applications .NET Application .NET Framework Operating System + Hardware
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- 17. .Net Architecture .NETarchitecture is: • multi-language • cross-platform • based on the CLR, FCL, and JIT technology • .NET components are packaged as assemblies
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- 19. .Net Technical Architecture VB C++ C# Common Language Specification Windows Forms ADO.NET: Data and XML Base Class Library Common Language Runtime Visual Studio.NET ASP.NET: Web Services and Web Forms JScript … Windows Forms
- 20. Common Language Runtime A common runtime for all .NET languages • Common type system • Common metadata • Intermediate Language (IL) to native code compilers • Memory allocation and garbage collection • Code execution and security Over 15 languages supported today • C#, VB, Jscript, Visual C++ from Microsoft • Perl, Python, Smalltalk, Cobol, Haskell, Mercury, Eiffel, Oberon, Oz, Pascal, APL, CAML, Scheme, etc. Rational is working on Java compiler for CLR
- 21. The CLR Architecture Base Class Library Support Thread Support COM Marshaler Type Checker Exception Manager Security Engine Debug Engine Class Loader MSIL to Native Compilers (JIT) Code Manager Garbage Collector (GC)
- 22. CLR Execution Model(Narrow) Code in VB.NET Code in C# Code in another .NET Language VB.NET compiler C# compiler Appropriate Compiler IL(Intermediate Language) code CLR just-in-time execution
- 23. CLR Execution Model Source VB code Compiler C# C++ Compiler Compiler Assembly IL Code Assembly IL Code Assembly IL Code Common Language Runtime JIT Compiler Native Code Operating System Services Managed code Unmanaged Component
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- 25. CLR based execution APP.exe other FCL components JIT Compiler obj code CLR OS Process Core FCL Underlying OS and HW
- 26. Common Language Runtime Execution Engine • Compiles Microsoft Intermediate Language (MSIL) into native code • Handles garbage collection •Handles exceptions • Enforces code access security • Handles verification • Managed v. Unmanaged
- 27. Implications of CLRexecution model 1. Clients need CLR & FCL to run .NET apps • available via Redistributable .NET Framework 2. Design trade-off… + managed execution (memory protection, verifiable code, etc.) + portability: – slower execution?
- 28. CLR and JITcompiling Indirect execution of .Net applications. All .NET languages compile to the same CIL. The CLR transforms the CIL to assembly instructions for a particular hardware architecture. • This is termed jit’ing or Just-in-time compiling. • Some initial performance cost, but the jitted code is cached for further execution. • The CLR can target the specific architecture in which the code is executing, so some performance gains are possible.
- 29. Advantages of CLR Support for developer services (debugging) Interoperation between managed code and unmanaged code (COM, DLLs). Managed code environment Improved memory handling Improved “garbage collection”
- 30. Advantages of CLR JIT allows code to run in a protected environment as managed code. JIT allows the IL code to be hardware independent. CLR also allows for enforcement of code access security. Verification of type safety. Access to Metadata (enhanced Type Information)
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- 33. Common Language Infrastructure CLI allows for cross-language development. Four components: Common Type System (CTS) Meta-data in a language agnostic fashion. Common Language Specification – behaviors that all languages need to follow. A Virtual Execution System (VES).
- 34. Common Type System(CTS) A specification for how types are defined and how they behave. • no syntax specified A type can contain zero or more members: • Field •Method • Property • Event
- 35. Common Type System(CTS) System-defined types String Array ValueType Exception Delegate Class1 Multicast Delegate Class2 Class3 Object Enum Structure1 Enum1 Primitive types Boolean Byte Int16 Int32 Int64 Char Single Double Decimal DateTime User-defined types Delegate1 TimeSpan Guid
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- 37. Common Data Types CLR provides a set of primitive types that all languages must support. The data types include: • Integer—three types 16/32/64 bits • Float—two types: 32/64 bits • Boolean and Character • Date/time and Time span The primitive types can be collected into • Arrays • Structures • Combination of the two
- 38. Common Language Specification(CLS) Not all languages support all CTS types and features • C# is case sensitive, VB.NET is not • C# supports pointer types (in unsafe mode), VB.NET does not • C# supports operator overloading, VB.NET does not CLS was drafted to promote language interoperability • vast majority of classes within FCL are CLS-compliant
- 39. Comparison to Java compile execute Hello.java Hello.class JVM Source code Byte code compile execute Hello.vb Hello.exe CLR Source code CIL
- 40. Base Class Library@ FCL Unified Classes Web Classes (ASP.NET) Controls, Caching, Security, Session, Configuration etc Data (ADO.NET) Windows Forms ADO, SQL,Types etc XML Classes Design, Cmpnt Model etc Drawing Classes Drawing, Imaging, Text, etc XSLT, Path, Serialization etc System Classes Collections, Diagnostics, Globalization, IO, Security, Threading Serialization, Reflection, Messaging etc
- 41. Base Class Library Similar to Java’s System namespace. Used by all .NET applications Has classes for IO, threading, database, text, graphics, console, sockets/web/mail, security, cryptography, COM, run-time type discovery/invocation, assembly generation
- 42. Framework Class Library@ BCL Single consistent set of object oriented class libraries to enable building distributed web applications (Unified Classes) Built using classes arranged across logical hierarchical namespaces Work with all CLR languages • No more “VBRun” or “MFC” divide
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- 44. Intermediate Language (IL) .NET languages are not compiled to machine code. They are compiled to an Intermediate Language (IL). CLR accepts the IL code and recompiles it to machine code. The recompilation is just-in-time (JIT) meaning it is done as soon as a function or subroutine is called. The JIT code stays in memory for subsequent calls. In cases where there is not enough memory it is discarded thus making JIT process interpretive.
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