Introduction to .net
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The document introduces .NET framework, which was first developed by Microsoft in 2000. It targets primarily Windows but can also run on Linux, Unix and Mac OS through Mono. The main languages used for .NET are C#, VB.NET, C++/CLI and J#. Source code in .NET languages get compiled into CIL (Common Intermediate Language) bytecode that runs on CLR (Common Language Runtime) instead of directly compiling to machine code like Java. It also shows a simple "Hello World" example written in VB.NET.
![Hello, VB.NET!
.method public static void Main() cil
managed
Module Hello {
Sub Main() .entrypoint
Console.WriteLine("Hello, .custom instance void
VB.NET!") [mscorlib]System.STAThreadAttribute::.ctor(
End Sub ) = ( 01 00 00 00 )
End Module // Code size 14 (0xe)
.maxstack 8
IL_0000: nop
IL_0001: ldstr "Hello VB.NET!"
ildasm Hello.exe IL_0006: call void
[mscorlib]System.Console::WriteLine(string)
IL_000b: nop
IL_000c: nop
IL_000d: ret
} // end of method Hello::Main](https://image.slidesharecdn.com/introductionto-net-130330014741-phpapp02/85/Introduction-to-net-6-320.jpg)
Introduction to .net
- 1. Introduction to .NET Frank McCown TechLunch Old Dominion University March 28, 2007
- 2. Before .NET Windows GUI development: Win32 API, MFC, Visual Basic Web development: ASP Java – “Write once, run anywhere.” Embrace and extend: Visual J++
- 3. .NET Framework First developed by Microsoft in 2000 Current version (3.0) released in Nov 2006 Targets primarily Windows OS, but Mono Project (headed by Novell) supports Linux, Unix, FreeBSD, Mac OS X, Solaris Primary languages: C#, Visual Basic .NET, C++/CLI, and J# Third-party languages: Ada, COBOL, LISP, Perl, Ruby, and many more
- 5. Comparison to Java compile execute Hello.java Hello.class JVM Source code Byte code compile execute Hello.vb Hello.exe CLR Source code CIL
- 6. Hello, VB.NET! .method public static void Main() cil managed Module Hello { Sub Main() .entrypoint Console.WriteLine("Hello, .custom instance void VB.NET!") [mscorlib]System.STAThreadAttribute::.ctor( End Sub ) = ( 01 00 00 00 ) End Module // Code size 14 (0xe) .maxstack 8 IL_0000: nop IL_0001: ldstr "Hello VB.NET!" ildasm Hello.exe IL_0006: call void [mscorlib]System.Console::WriteLine(string) IL_000b: nop IL_000c: nop IL_000d: ret } // end of method Hello::Main
- 7. Helpful Resources Comparison of Java vs. C# http://en.wikipedia.org/wiki/Comparison_of_C_Sharp_and_Java http://www.harding.edu/fmccown/java1_5_csharp_comparison.html Comparison of VB.NET vs. C# http://en.wikipedia.org/wiki/Comparison_of_C_sharp_and_Visual_Basic_.NET http://www.harding.edu/fmccown/vbnet_csharp_comparison.html
Editor's Notes
- #3: MFC was introduced in 1992. VB created in 1991. Replaced by VB.NET. MS stopped supporting VB in 2005. ASP first developed in 1996. Used VBScript. “Write once, test everywhere.” – Hooks to OS or hardware specific devices means Java code must be changed.
- #4: C#'s principal designer and lead architect at Microsoft is Anders Hejlsberg who also developed Turbo Pascal, Borland Delphi, and Visual J++. C++/CLI (Common Language Infrastructure) supersedes managed C++. It contains new syntax that helps clarify if using managed or unmanaged memory. http://en.wikipedia.org/wiki/C%2B%2B/CLI Managed vs. unmanaged code. What is the advantage of running managed code? Of running unmanaged code?
- #5: CIL is also called MSIL (Microsoft Intermediate Lang)
- #6: Byte codes are interpreted by the JVM or JITted before being executed. CIL is JITted into object code which is executed by the CLR.