Download Microsoft .NET

Microsoft .NET
Norman White
Stern School of Business
Agenda
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What is.NET
SOAP
UDDI
WSDL
CLR
What is .NET?
• Simply put, it is Microsoft’s solution to the market
demand for “WEB Services”
– I.e. services that can be hosted and accessed anywhere on
the web
• Web Services encompass
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SOAP Simple Object Access Protocol
XML eXtensible Markup Language
UDDI – Universal Description, Discovery and Integration
WSDL – Web Services Description Language
• All Web Services run over standard web protocols
– I.e. http,SSl, HTTPS …
WEB Services Promise…
• Ability to distribute applications
anywhere on the Web
• Services can be changed / updated
without touching the calling application
• Should dramatically increase ease of
implementing B2B applications
SOAP
• Simple Object Access Protocol
– Allows movement of data defined by XML
– Describes a message and how it should be
treated
– Has rules for relating data in an application to data
in a database
– Has a framework for developing processes and
procedures that can run on one system while
calling data from another
– Can run over lower level protocols like HTTP
• Allows .NET to talk to .NET and other web
services
UDDI
Universal Description, Discovery and Integration
• Use SOAP and XML to define ways for
applications to find out about the
existence and capabilities of other
applications
• Should speed up interactions that use
SOAP and XML
WSDL
Web Services Description Language
• Does for web services what XML does
for data
– Defines services and describes ways of
invoking them
– Provides a complete description of a
service,its location (I.e address,port), and a
list of operations available.
What was the problem?
• Early Microsoft web technologies focused
around Active Server Pages (ASP)
• ASP has problems
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Interpreted (performance)
Not truly object oriented (no inheritance etc.)
Not really structured code
Hard to maintain
Competition has better tools (JSP,J2EE) etc.
Solution, .NET
• Complete redesign, with all tools
running on a Common Language
Runtime (CLR), similar (VERY) to the
Java Runtime Environment (JRE) in
functionality.
• CLR hides OS from applications,
supports multi language development,
• Much cleaner architecture
CLR- more than runtime
support
• CLR incorporates
– Security
– Intermediate language compilation to
native code (on intel)
– Traditional run time support functions
• File opening
• OS interface etc.
CLR Features
• Common data types across all languages
• Standard interface calls
• Every program includes meta data about
itself, so it is “self-describing”
• Programs can be run without being
“installed”. DLL hell is gone.
– The program has imbedded info on “EXACTLY”
what components it needs. (I.e particular version
of DLL (Dynamic Link Library) component.
Other .NET additions
• New language
– C# (C Sharp)
• VERY similar to Java but designed for Microsoft
environment
• ASP.NET
– New (different ) version of ASP
– Generates compiled version of pages
automatically (like JSP) in CIL (Common
Intermediate Language)
– C# now supported as a scripting language
Convergence
• We are seeing some convergence between
the two (new) competing technologies for
web services, I.e. JSP and .NET
• Two approaches should interoperate, (but
probably with some limitations)
• .NET approach much more encompassing
than JSP due to inclusion of ADO, CLR and
other features
• .NET can (theoretically) be ported to other
operating systems…. (already runs on all
Windows OSes, but depends on IIS facilities)
Some Differences between
JSP and .NET
.NET
J2EE
C# MS only
Java run anywhere
.NET common Components (XML, JAVA core API
SOAP)
ADO integrated with SOAP etc.
JDBc, RMI etc. up to
developer
Many Languages
(C#,VB,C++, etc.)
Java only
One IDE (Visual Studio)
Many
Tight integration between
components
Loose integration using
CORBA, ORB
Management Takeaway
• .NET is significant direction for MS
• Typical “Embrace and Extend” philosophy of Gates
• In theory, fixes many of the complaints about the IIS,
ASP development environment
• Strong contender against JSP et al., more tightly
integrated
• Makes developing distributed WEB applications even
easier in MS environment
• Also provides future base for non-web applications
without DLLs..
• What happens if you PORT CLR to UNIX?
– MONO project at Simian
NEWS FLASH
November 2005
• Microsoft offers new versions of
– SQLServer – SQL server 2005
– Visual Studio 2005
– Web Services exposed directly from SQL
Server
– Data Analysis and Mining built in to SQL
Server