.NET Framework Design Goals

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.NET Framework Design Goals

• Dramatically simplifies development and
  deployment
• Unifies programming models
• Provides robust and secure execution environment
• Supports multiple programming languages

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Framework, Languages, And Tools
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demo
One Lap Around .NET
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Demo One Lap Around .NET

• Create a simple Web Service
• Test it in Internet Explorer
• Add data logic to it
• Build a smart client for it
• Show seamless and safe deployment of the smart
  client

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Framework, Languages, And Tools
Visual Studio.NET
Common Language Specification
ADO.NET and XML
Base Class Library
Common Language Runtime
Operating System
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The .NET Evolution
Application
Code and data structures
Before COM, applications were completely separate
entities with little or no integration
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The .NET Evolution
COM provides a way for components to integrate
However, each component must provide the
plumbing and objects cannot directly interact
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The .NET Evolution
With the .NET Framework common language runtime,
components are built on a common substrate No
plumbing is needed and objects can directly
interact
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Compilation And Execution
Compilation
Code (IL)
Source Code
Metadata
At installation or the first time each method is
called
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Simplify Development

• Completely eliminates COM plumbing
• No more
• Registration
• GUIDs
• .IDL files
• HRESULTs
• IUnknown
• AddRef/Release
• CoCreateInstance

gtself described apps
gthierarchical namespaces
gtunified object model
gtstructured exceptions
gtcommon root object
gtgarbage collector
gtnew operator
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Simplify Development

• Common Type System
• Common instance and type definition
• Enables clean OO programming
• Classes and interfaces
• Constructors, properties, methods, events
• Cross language inheritance
• Built-in interoperability
• With COM
• With native (Win32 style) DLLs

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Everything Is An Object

• Traditional views of primitive types
• C, Java Theyre magic
• Smalltalk, Lisp Theyre full-blown objects
• .NET Framework solution Value types
• unifies with no performance cost
• Deep simplicity throughout system
• Improved extensibility and reusability
• New primitive types Decimal, SQL
• Collections, etc., work for all types

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Everything Is An Object

• Boxing
• Allocates box, copies value into it
• Unboxing
• Checks type of box, copies value out

int i 123 object o i int j (int)o
Dim i As Integer 123 Dim o As Object i Dim j
As Integer CInt(o)
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Robust Environment

• Automatic lifetime management
• All objects are garbage collected
• Exception handling
• Error handling first class and mandatory
• Type-safety
• No buffer overruns, No unsafe casts,
  Uninitialized variables

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Secure Environment

• Security designed-in
• Code access security enforcement
• Security based on the identity of code
• Administratively configurable via policy
• ASP.NET integrated authentication of user
• Windows identity, Passport, forms-based,
• Cryptography library with XML DSIG support
• Digital signature for XML (www.w3.org/signature)

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Simplify Deployment And Management

• Zero-impact install
• Applications and components can be shared or
  private
• Side-by-side execution
• Multiple versions of the same component can
  co-exist on a system
• Assemblies
• Contain dependency information

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Framework, Languages, And Tools
Visual Studio.NET
Common Language Specification
ADO.NET and XML
Base Class Library
Common Language Runtime
Operating System
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Unify Programming Models
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How Much Simpler?
Windows API
HWND hwndMain CreateWindowEx( 0,
"MainWClass", "Main Window",
WS_OVERLAPPEDWINDOW WS_HSCROLL WS_VSCROLL,
CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT,
CW_USEDEFAULT, (HWND)NULL, (HMENU)NULL,
hInstance, NULL) ShowWindow(hwndMain,
SW_SHOWDEFAULT) UpdateWindow(hwndMain)
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Factored And Extensible

• The Framework is not a black box
• Any .NET class is available for you to extend
  through inheritance
• Gives developers much more head room
• Plug and Play components and subsystems

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The .NET Framework Library
ADO.NET and XML
Base Class Library
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The .NET Framework Library
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Base Framework
System
Security
Collections
ServiceProcess
Configuration
Text
Diagnostics
Threading
Globalization
IO
Runtime
InteropServices
Net
Remoting
Reflection
Serialization
Resources
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Data And XML
System.Data
SQLClient
OleDb
SQLTypes
Common
System.Xml
Serialization
XSLT
XPath
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ASP.NET
System.Web
Services
UI
HtmlControls
Description
WebControls
Discovery
Protocols
Caching
Security
Configuration
SessionState
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Windows Forms
System.Windows.Forms
Design
ComponentModel
System.Drawing
Drawing2D
Printing
Imaging
Text
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Framework, Languages, And Tools
Visual Studio.NET
Common Language Specification
ADO.NET and XML
Base Class Library
Common Language Runtime
Operating System
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Languages

• The .NET Platform is language neutral
• All .NET languages are first class players
• You can leverage your existing skills
• Common language specification
• Set of features guaranteed to be in all languages
• We are providing
• Visual Basic, C, C, J, JScript
• Third-parties are building
• APL, COBOL, Delphi, Pascal, Eiffel, Haskell, ML,
  Oberon, Perl, Python, Scheme, Smalltalk

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Standardization

• A subset of the .NET Framework and C submitted
  to ECMA
• Adopted as International standards in Dec. 2001
• In the ISO fast-track process now
• Co-sponsored with Intel, Hewlett-Packard
• Common language infrastructure
• Based on common language runtime and base
  framework
• Layered into increasing levels of functionality

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Additional Resources

• Learn about Web development with .NET
• DEV334 Introduction to Web Forms
• Learn about client development with .NET
• DEV350 Building Smart Client Applications
• Learn about Network class libraries
• DEV342 The .NET Framework Net Class Libraries
• Get the Deep Technical Drill Down
• DEV366 .NET Framework Under the Hood
• Learn how to Architect an application
• DEV310 Architecting Enterprise Applications
  with Visual Studio .NET
• DEV358 Architecting N-Tier .NET Applications
• DEV402 Design Choices for Implementing
  Distributed Applications in .NET

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Summary

• The .NET Framework
• Dramatically simplifies development and
  deployment
• Unifies programming models
• Provides robust and secure execution environment
• Supports multiple programming languages