c# datamatrix Automatic Garbage Collection in Visual C#

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Automatic Garbage Collection
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The CLR has a tool called the Garbage Collector (GC), which automatically manages memory. The GC automatically deletes objects from memory that your program will no longer access. The GC relieves the programmer of tasks that he or she has traditionally had to perform, such as deallocating memory and hunting for memory leaks. Hunting for memory leaks can be difficult and time-consuming, so this is no small feature.
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CHAPTER 1 C# AND THE .NET FRAMEWORK
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The .NET Framework was designed for interoperability between different .NET languages, the operating system, and COM. .NET language interoperability allows software modules written using different .NET languages to interact. A program written in one .NET language can use and even inherit from a class written in another .NET language, as long as certain rules are followed. Because of its ability to easily integrate modules produced in different programming languages, the .NET Framework is sometimes described as language agnostic. The platform invoke (P/Invoke) features allow code written for .NET called managed code to call and use code not written for .NET, such as the Win32 system calls. The .NET Framework allows interoperability with COM, in that .NET software components can call COM components, and COM components can call .NET components.
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No COM Required
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The .NET Framework frees the programmer from the COM legacy. As a C# programmer, you do not need to use COM, and therefore do not need any of the following: The IUnknown interface: In COM, all objects must implement interface IUnknown. In contrast, all .NET objects derive from a single class called object. Interface programming is still an important part of .NET, but it is no longer the central theme. Type libraries: In .NET, information about a program s types is kept together with the code in the program file, not in a separate type library the way it is in COM. Reference counting: The programmer no longer has to keep track of references to objects. In .NET, the GC keeps track of references and deletes objects when appropriate. HRESULT: The HRESULT data type used in COM to return runtime error codes is not used in .NET. Instead, all runtime errors produce exceptions. The registry: This system-wide database that holds information about the operating system and application configurations is not used when deploying .NET applications. This simplifies installation and removal of programs.
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CHAPTER 1 C# AND THE .NET FRAMEWORK
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Deploying programs written for the .NET Framework can be considerably easier than it was previously, for the following reasons: .NET programs do not need to be registered with the registry. In the simplest case, a program just needs to be copied to the target machine. Side-by-side execution allows different versions of a DLL to exist on the same machine. This means that every executable can have access to the version of the DLL for which it was built.
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Type Safety
The CLR checks and ensures the type safety of parameters and other data objects even between components written in different programming languages.
The Base Class Library
The .NET Framework supplies an extensive base class library, called, not surprisingly, the Base Class Library (BCL). It is also called the Framework Class Library. You can use this extensive set of available code when writing your own programs. Some of the categories of base classes provided are as follows: General base classes: Provide you with an extremely powerful set of tools for a wide range of programming tasks, such as string manipulation, security, and encryption Windows Forms classes: For building Windows GUI applications ASP.NET classes: For building web-based applications ADO.NET classes: For database manipulation
CHAPTER 1 C# AND THE .NET FRAMEWORK
Compiling to the Common Intermediate Language (CIL)
The compiler for a .NET language takes a source code file and produces an output file called an assembly. In non-.NET terms, an assembly is either an executable or a DLL. The process is illustrated in Figure 1-3. The code in the assembly is not native machine code, but an intermediate language called the Common Intermediate Language (CIL). Among other things, the assembly contains the following: The program s CIL Metadata about the types used in the program Metadata about references to other assemblies
Figure 1-3. The compilation process The acronym for the intermediate language has changed over time. Other terms for the CIL that you might encounter are IL (Intermediate Language), and MSIL (Microsoft Intermediate Language), which was used during initial development and early documentation.
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