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1. Introduction to Microsoft .NET
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Although not a stated goal of .NET, it is very much in the interests of Microsoft and its customers for many of Microsoft's overlapping and competing products and technologies to be rationalized and consolidated. The .NET platform presents the ideal scenario for such an exercise, making it more palatable to the user community because the new technology will offer greater integration with the .NET platform.
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Overview of .NET
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The .NET label is frequently applied to a broad range of technologies, products, and marketing initiatives, much the same as the Java label. Specifically, the scope of the .NET initiative can be broken down into the following five areas:
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The .NET Framework Development tools Server products Devices and clients Building block services
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The .NET Framework
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The .NET Framework is roughly equivalent to the Java platform, consisting of a set of class libraries and a run-time execution environment, not unlike the Java Virtual Machine. Java binds these two items together with the Java Language Specification, whereas the .NET Framework is designed to support multiple languages, including C# and modified forms of Visual Basic and C++, and so does not include a single language specification.
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Microsoft Intermediate Language
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The Microsoft intermediate language (MSIL) is the equivalent of the Java byte code system. When compiling a Java source file, the compiler generates a class file that contains Java byte codes representing instructions for the virtual machine. Because these instructions will be interpreted at run time and are not the native instructions of a processor, byte codes are known as an intermediate representation of the application logic. When a C# source file (or a source file containing any other .NET-compatible language) is compiled, the output consists of MSIL instructions. Like Java byte codes, MSIL is an intermediate representation and must be compiled to native instructions in order to be executed; this task is delegated to the common language runtime, discussed next.
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The Common Language Runtime
The common language runtime (CLR) is responsible for managing the execution of code and providing core services such as automatic memory management, threading, security, and integration with the underlying operating system responsibilities similar to those of the Java Virtual Machine.
1. Introduction to Microsoft .NET
Before MSIL can be executed, it must be translated into native code, which is specific to a particular CPU. This process is called just-in-time (JIT) compiling and is a core feature of the CLR. MSIL cannot be interpreted like Java byte codes; the JIT cannot be disabled. The tight integration between the Windows operating system and the format of a .NET application means that the CLR is invoked automatically when a .NET application is started.
The Common Type System
The CTS defines how types are declared, used, and managed at run time. The CTS is an important part of the .NET cross-language support and provides the basis for types written in one language to be used in another.
The Common Language Specification
The Common Language Specification (CLS) is a subset of the CTS. Components that conform to the CLS are guaranteed to be usable by any other component that conforms to the specification. For more information, see Appendix E, "Cross-Language Code Interoperability."
Base Class Libraries
Like Java, the .NET Framework includes a rich set of libraries that a programmer can use and extend during the development process. All of the types contained in the class libraries are CLS-compliant and can be used from any language whose compiler conforms to the CLS, including the C# compiler. The scope of the .NET class libraries is similar to that of the Java libraries and includes types that
Represent basic data types and exception Support I/O and networking Support reflection of types Support platform and application security Integrate with the underlying operating system Provide services for constructing GUI applications Provide access to databases Support the development of XML Web services
More Information
2, "Comparing Java and .NET Technologies," provides a high-level comparison of the Java and .NET class libraries. Part III, "Programming .NET with C#," and Part IV, "Advanced Topics," demonstrate how to program the .NET class libraries with C#.
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