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Formatting Enumerations
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C# allows you to format the values defined by an enumeration In general, enumeration values can be displayed using their name or their value The enumeration format specifiers are shown in Table 22-10 Pay special attention to the G and F formats Enumerations that will be used to represent bit-fields can be preceded by the Flags attribute Typically, bitfields hold values that represent individual bits and are arranged in powers of two If the Flags attribute is present, then the G specifier will display the names of all of the values that comprise the value, assuming the value is valid The F specifier will display the names of all of the values that comprise the value if the value can be constructed by ORing together two or more fields defined by the enumeration
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Specifier D d F
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Meaning Displays the value as a decimal integer Same as D Displays the name of the value However, if the value can be created by ORing together two or more values defined by the enumeration, then the names of each part of the value will be displayed (This applies whether or not the Flags attribute has been specified) Otherwise, the value is displayed as an integer Same as F Displays the name of the value If the enumeration is preceded by the Flags attribute, then all names that are part of the value will be displayed (assuming a valid value) An invalid value is displayed as an integer Same as G Displays the value as a hexadecimal integer Leading zeros will be added to ensure that at least eight digits are shown Same as X
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The Enumeration Format Speci ers
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g X x
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TABLE 22-10
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22:
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Strings and Formatting
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The following program demonstrates the enumeration specifiers:
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// Format an enumeration using System; class EnumFmtDemo { enum Direction { North, South, East, West } [Flags] enum Status { Ready=0x1, OffLine=0x2, Waiting=0x4, TransmitOK=0x8, RecieveOK=0x10, OnLine=0x20 }
PART II
static void Main() { Direction d = DirectionWest; ConsoleWriteLine("{0:G}", ConsoleWriteLine("{0:F}", ConsoleWriteLine("{0:D}", ConsoleWriteLine("{0:X}", d); d); d); d);
Status s = StatusReady | StatusTransmitOK; ConsoleWriteLine("{0:G}", ConsoleWriteLine("{0:F}", ConsoleWriteLine("{0:D}", ConsoleWriteLine("{0:X}", } } s); s); s); s);
The output is shown here:
West West 3 00000003 Ready, TransmitOK Ready, TransmitOK 9 00000009
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CHAPTER
Multithreaded Programming, Part One
lthough C# contains many exciting features, one of its most powerful is its built-in support for multithreaded programming A multithreaded program contains two or more parts that can run concurrently Each part of such a program is called a thread, and each thread defines a separate path of execution Thus, multithreading is a specialized form of multitasking Multithreaded programming relies on a combination of features defined by the C# language and by classes in the NET Framework Because support for multithreading is built into C#, many of the problems associated with multithreading in other languages are minimized or eliminated As you will see, C# s support of multithreading is both clean and easy to understand With the release of version 40 of the NET Framework, two important additions were made that relate to multithreaded applications The first is the Task Parallel Library (TPL), and the other is Parallel LINQ (PLINQ) Both provide support for parallel programming, and both can take advantage of multiple-processor (multicore) computers In addition, the TPL streamlines the creation and management of multithreaded applications Because of this, TPL-based multithreading is now the recommended approach for multithreading in most cases However, a working knowledge of the original multithreading subsystem is still important for several reasons First, there is much preexisting (legacy) code that uses the original approach If you will be working on or maintaining this code, you need to know how the original threading system operated Second, TPL-based code may still use elements of the original threading system, especially its synchronization features Third, although the TPL is based on an abstraction called the task, it still implicitly relies on threads and the thread-based features described here Therefore, to fully understand and utilize the TPL, a solid understanding of the material in this chapter is needed Finally, it is important to state that multithreading is a very large topic It is far beyond the scope of this book to cover it in detail This and the following chapter present an overview of the topic and show several fundamental techniques Thus, it serves as an introduction to this important topic and provides a foundation upon which you can build
Part II:
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