about dotnet framework overview

8/6/2019 About DotNET Framework Overview

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.NET Enterprise Vision

ERP & Billing

Customer

Service

Sales

UsersAny device,

Any place,Any time

XML Web

ServicesIntegrate businessapplications andprocesses

Back OfficeHeterogeneousapplication andserverinfrastructure

SchedulingAuthentication

Notification


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So what is .NET?

Microsoft .NET (pronounced dot net) isa software component that runs on theWindows operating system.

.NET provides tools and libraries thatenable developers to create Windowssoftware much faster and easier.

.NET benefits end-users by providingapplications of higher capability, qualityand security.


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Cont..

Microsoft describes .NET:

.NET is the Microsoft Web servicesstrategy to connect information, people,

systems, and devices through software..NET technology provides the ability toquickly build, deploy, manage, and useconnected, security-enhanced solutionswith Web services.


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.NET Framework

Programming model for .NET

Platform for running .NET managed codein a virtual machine

Provides a very good environment todevelop networked applications andWeb Services

Provides programming API and unifiedlanguage-independent developmentframework


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The Core Component of .NETFramework: FCL, CLR & CLS

Common Language Runtime

Garbage collection and Language integration

Multiple versioning support (no

more DLL hell!)Integrated security

services such as:

Loads and executes codeConverts intermediate language to native

machine code


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Cont..

Separates processes and memoryManages memory and objects

Enforces code and access security

Handles exceptions

Interfaces between managed code, COM objects, andDLLs

Provides type-checking

Provides code meta data (Reflection)

Provides profiling, debugging, etc.


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Cont..

Framework Class Library

Provides the core functionality:

ASP.NET, Web Services, ADO.NET,

Windows Forms, IO, XML, etc.The FCL is a collection of over 7000

classes and data types that enable.NET applications to read and write

files, access databases, process XML,display a graphical user interface,draw graphics, use Web services, etc.


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.NET FrameworkCommon Language Runtime

Operating System


CLR manages code executionat runtime

Memory management, threadmanagement, etc.


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.NET FrameworkBase Class Library

Operating System


.NET Framework (Base Class Library)

Object-oriented collection ofreusable types

Collections, I/O, Strings,


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.NET FrameworkData Access Layer

Operating System



ADO .NET and XML

Access relational databases

Disconnected data model

Work with XML


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.NET FrameworkASP.NET & Windows Forms

Operating System



ADO .NET and XML

ASP .NETWeb Forms Web Services

Mobile Internet Toolkit

WindowsForms

Create applications front-end Web-based user interface, Windows GUI,Web services,


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.NET FrameworkProgramming Languages

Operating System



ADO .NET and XML



WindowsForms

C++ C# VB.NET Perl J#

Use your favorite language


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.NET FrameworkCommon Language Specification

Operating System



ADO .NET and XML



WindowsForms

Common Language SpecificationC++ C# VB Perl J#


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.NET FrameworkVisual Studio .NET

Operating System



ADO .NET and XML



WindowsForms

Common Language Specification

C++ C# VB Perl J#

VisualStudio

.NET


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Operating System



ADO .NET and XML

ASP .NETWeb Services Web Forms


WindowsForms

Common Language Specification

C++ C# VB Perl J#

VisualStudio

.NET

Open LanguageSpecification

C# Language Submitted to ECMA

XML-baseddata access

Web services XML, SOAP-based

.NET FrameworkStandards Compliance


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Common Language RuntimeManages running code like a virtual machine

Threading

Memory management

No interpreter: JIT-compiler produces native

code during the program installation or atrun time

Fine-grained evidence-based security

Code access security Code can be verified to guarantee type safety

No unsafe casts, no un-initialized variables andno out-of-bounds array indexing

Role-based security


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Managed Code

Code that targets the CLR is referred to asmanaged code

All managed code has the features of the CLR

Object-orientedType-safe

Cross-language integration

Cross language exception handlingMultiple version support

Managed code is represented in special

Intermediate Language (IL)


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Automatic Memory Management

The CLR manages memory for managed codeAll allocations of objects and buffers made from a

Managed Heap

Unused objects and buffers are cleaned up

automatically through Garbage CollectionSome of the worst bugs in software development

are not possible with managed code

Leaked memory or objects

References to freed or non-existent objects

Reading of uninitialised variables

Pointerless environment


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Multiple Language Support

u IL (MSIL or CIL) Intermediate Languagev It is low-level (machine) language, like

Assembler, but is Object-orientedu CTS is a rich type system built into the CLR

v Implements various types (int, float, string, )

v And operations on those types

u CLS is a set of specifications that alllanguages and libraries need to followv This will ensure interoperability between

languages


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Intermediate Language

.NET languages are compiled to anIntermediate Language (IL)

IL is also known as MSIL or CIL

CLR compiles IL in just-in-time (JIT)manner each function is compiledjust before execution

The JIT code stays in memory for

subsequent calls

Recompilations of assemblies are alsopossible


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Common Type System (CTS)

All .NET languages have the same primitive datatypes. An intin C# is the same as an intinVB.NET

When communicating between modules written in

any .NET language, the types are guaranteed tobe compatible on the binary level

Types can be:

Value types passed by value, stored in the stack

Reference types passed by reference, stored in theheap

Strings are a primitive data type now


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Common LanguageSpecification (CLS)

Any language that conforms to the CLS isa .NET language

A language that conforms to the CLS has theability to take full advantage of theFramework Class Library (FCL)

CLS is standardized by ECMA


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.NET Languages

Languages provided by MicrosoftC++, C#, J#, VB.NET, JScript

Third-parties languages

Perl, Python, Pascal, APL, COBOL, Eiffel,Haskell, ML, Oberon, Scheme,Smalltalk

Advanced multi-language featuresCross-language inheritance and

exceptions handling

Object system is built in, not bolted on


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C# Language

Mixture between C++, Java and DelphiComponent-oriented

Properties, Methods, Events

Attributes, XML documentation

All in one place, no header files, IDL, etc.

Can be embedded in ASP+ pages

Everything really is an object

Primitive types arent magic

Unified type system == Deep simplicity

Improved extensibility and reusability


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C# Language Example

using System;

class HelloWorld

{public static void main()

{

Console.WriteLine(Hello, world!);

}

}


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Code Compilation and Execution

Compilation

Beforeinstallation orthe first time

each method is

calledExecutionJIT

CompilerNativeCode

MSILCode

Metadata

SourceCode

LanguageCompiler

Also calledAssembly

(.EXE or.DLL file)


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AssembliesDLL or EXE file

Smallest deployable unit in the CLR

Have unique version number

No version conflicts (known as DLL hell)

Contains IL code to be executed

Security boundary permissions are granted atthe assembly level

Type boundary all types include the assemblyname they are a part of

Self-describing manifest metadata thatdescribes the types in the assembly


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Metadata in Assembly

Type Descriptions

ClassesBase classesImplemented interfacesData members

Methods

NameVersionCulture

Assembly Description

Other assembliesSecurity PermissionsExported Types


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Applications

One or more assembliesAssemblies conflict resolution

Using metadata Local (preferred)

Global Assembly Cache (GAC)

Different applications may use different

versions of an assemblyEasier software updates

Easier software removal


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Visual Studio .NETDevelopment tool that contains a rich set of productivityand debugging featuresSupports managed and unmanaged applications

Supports C#, C++, VB.NET,

Many useful tools and wizards

Windows Forms Designer

ASP.NET Web Forms Designer

Web Services support

SQL Server integration with ADO.NET and XML

VS.NET is not part of the .NET Framework

Not necessary to build or run managed code

The .NET Framework SDK includes command line compilers


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VS.NET Single DevelopmentEnvironment & Skill Set

From Visual Studio.NET you can:

Write code

Design user interface

Study documentation

Debug

Test

Deploy

Same tools for all languages

Same tools for all platforms


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The .NET Framework Library

Base Class Library

ADO.NET and XML

Web Forms Web ServicesMobile Internet Toolkit

WindowsForms

ASP.NET


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.NET Contains:


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Version And Release:


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Summary

.NET Framework is a code execution platform theenvironment which .NET programs run

.NET Framework consists of two primary parts:Common Language Runtime and .NET Class

LibrariesThe CLS (Common Language Specification) allows

different languages to interact seamlessly.

The CTS (Common Type System) allows alllanguages to share base data types.


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Summary (2)

.NET languages are compiled to MSIL by theirrespective compilers

MSIL code is compiled to machine code by the JITcompiler

All .NET languages have equal access to the FCL(Framework Class Library) which is a rich set ofclasses for developing software

Base Class Library is set of basic classes:Collections, I/O, Networking, Security, etc.

ADO.NET provides .NET applications with accessto relational databases


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Summary (3)

.NET has great XML support including: DOM, XSLT,XPath, and XSchema

Windows Forms provides GUI interface for the .NETapplications

ASP.NET allows creating web interface to .NETapplications

Web Services expose functionality from web sites andmake it remotely accessible through standard XML-based protocols

Visual Studio .NET is powerful development IDE forall .NET languages and technologies


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.NET Framework ResourcesVisit following web sites:

.NET Framework Home Site http://msdn.microsoft.com/netframework/

The Microsoft .NET Framework Community http://www.gotdotnet.com/

ASP.NET http://www.asp.net/

.NET Windows Forms http://www.windowsforms.net/

Code Project http://www.codeproject.net/

Mono Open Source .NET Framework http://www.go-mono.org/

Rotor Shared Source .NET CLI http://msdn.microsoft.com/net/sscli/

Read the news groups:

news://msnews.microsoft.com/

i ft bli d t t f k
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