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languages This is possible because the language compilers translate each source language to the same intermediate language (CIL)
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Type safety: checks for conversion between types, ensuring that only
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conversions between compatible types will occur This helps prevent the occurrence of buffer overruns, a leading cause of security vulnerabilities
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Code access security: certification that the assembly developer s code
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has permission to execute on the computer
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Garbage collection: memory management that automatically de-
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allocates space for data allocated by the runtime
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Platform portability: support for potentially running the same assem-
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bly on a variety of operating systems One obvious restriction is that no platform-dependent libraries are used; therefore, as with Java, there are inevitably some idiosyncrasies that need to be worked out
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BCL: provides a large foundation of code that developers can depend
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C# and NET Versioning
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NOTE
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This section gives a brief synopsis of the CLI to familiarize you with the context in which a C# program executes It also provides a summary of some of the terms that appear throughout this book 21 is devoted to the topic of the CLI and its relevance to C# developers Although the chapter appears last in the book, it does not depend on any earlier chapters, so if you want to become more familiar with the CLI, you can jump to it at any time
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C# and NET Versioning
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Readers will notice that Output 11 refers to the NET Framework version 35 At the time of this writing, Microsoft had four major releases to the NET Framework and only three major C# compiler releases NET Framework version 30 was an additional set of API libraries released between C# compiler releases (and Visual Studio 2005 and 2008 versions) As a result, the current version for C# is 30 whereas the corresponding NET version is 35 Although some C# 30 functionality is available with the NET 20/30 Framework, this does not include the most significant features known as LINQ a series of API improvements for processing collections Table 13 is a brief overview of the C# andNET releases
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TABLE 13: C# and NET Versions
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Comment Type C# 10 with NET Framework 10/11 (Visual Studio 2002 and 2003) C# 20 with NET Framework 20 (Visual Studio 2005)
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Description The initial release of C# A language built from the ground up to support NET programming
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Generics were added to the C# language and the NET Framework 20 included libraries that supported generics An additional set of APIs for distributed communications (Windows Communication Foundation WCF), rich client presentation (Windows Presentation Foundation), workflow (Windows Workflow WF), and web authentication (Cardspaces)
Continues
NET Framework 30
1: Introducing C#
TABLE 13: C# and NET Versions (Continued)
Comment Type C# 30 with NET Framework 35 (Visual Studio 2008)
Description Added support for LINQ, a significant improvement to the APIs used for programming collections The NET Framework 35 provided libraries that extended existing APIs to make LINQ possible
The majority of all code within this text will work with platforms other than Microsoft s as long as the compiler version corresponds to the version of code required Although I would very much have liked to provide full details on each C# platform so as not to detract from the focus of learning C#, I restrict information such as this to Microsoft s platform, NET This is simply because Microsoft has the predominant (by far) implementation Furthermore, translation to another platform is fairly trivial
Common Intermediate Language and ILDASM
As mentioned in the previous section, the C# compiler converts C# code to CIL code and not to machine code The processor can directly understand machine code but CIL code needs to be converted before the processor can execute it Given an assembly (either a DLL or an executable), it is possible to view the CIL code using a CIL disassembler utility to deconstruct the assembly into its CIL representation (The CIL disassembler is commonly referred to by its Microsoft-specific filename, ILDASM, which stands for IL Disassembler) This program will disassemble a program or its class libraries, displaying the CIL generated by the C# compiler The exact command used for the CIL disassembler depends on which implementation of the CLI is used You can execute the NET CIL disassembler from the command line as shown in Output 18
OUTPUT 18: