Chapter 20: Exploring the System Namespace


This chapter explores the System namespace. System is the top-level namespace of the C# library. It directly contains those classes, structures, interfaces, delegates, and enumerations that are most commonly used by a C# program or that are deemed otherwise integral to the .NET Framework. Thus, System defines the core of the C# library. System also contains many nested namespaces that support specific subsystems, such as System.Net. Several of these subsystems are described later in this book. This chapter is concerned only with the members of System, itself.

The Members of System

In addition to a large number of exception classes, System contains the following classes:

ActivationContext (Added by C# 2.0.)

Activator

AppDomain

AppDomainManager (Added by C# 2.0.)

AppDomainSetup

ApplicationId (Added by C# 2.0.)

ApplicationIdentity (Added by C# 2.0.)

Array

AssemblyLoadEventArgs

Attribute

AttributeUsageAttribute

BitConverter

Buffer

CharEnumerator

CLSCompliantAttribute

Console

ConsoleCancelEventArgs (Added by C# 2.0.)

ContextBoundObject

ContextStaticAttribute

Convert

DBNull

Delegate

Environment

EventArgs

Exception

FileStyleUriParser (Added by C# 2.0.)

FlagsAttribute

FtpStyleUriParser (Added by C# 2.0.)

GC

GenericUriParser (Added by C# 2.0.)

GopherStyleUriParser (Added by C# 2.0.)

HttpStyleUriParser (Added by C# 2.0.)

LdapStyleUriParser (Added by C# 2.0.)

LoaderOptimizationAttribute

LocalDataStoreSlot

MarshalByRefObject

Math

MTAThreadAttribute

MulticastDelegate

NetPipeStyleUriParser (Added by C# 2.0.)

NetTcpStyleUriParser (Added by C# 2.0.)

NewsStyleUriParser (Added by C# 2.0.)

NonSerializedAttribute

Nullable (Added by C# 2.0.)

Object

ObsoleteAttribute

OperatingSystem

ParamArrayAttribute

Random

ResolveEventArgs

SerializableAttribute

STAThreadAttribute

String

StringComparer (Added by C# 2.0.)

ThreadStaticAttribute

TimeZone

Type

UnhandledExceptionEventArgs

Uri

UriBuilder

UriParser (Added by C# 2.0.)

UriTypeConverter (Added by C# 2.0.)

ValueType

Version

WeakReference

 

System defines the following structures:

ArgIterator

ArraySegment<T> (Added by C# 2.0.)

Boolean

Byte

Char

ConsoleKeyInfo (Added by C# 2.0.)

DateTime

Decimal

Double

Enum

Guid

Int16

Int32

Int64

IntPtr

ModuleHandle (Added by C# 2.0.)

Nullable<T> (Added by C# 2.0.)

RuntimeArgumentHandle

RuntimeFieldHandle

RuntimeMethodHandle

RuntimeTypeHandle

SByte

Single

TimeSpan

TypedReference

UInt16

UInt32

UInt64

UIntPtr

Void

System defines the following interfaces:

_AppDomain

IAppDomainSetup

IAsyncResult

ICloneable

IComparable

IComparable<T> (Added by C# 2.0.)

IConvertible

ICustomFormatter

IDisposable

IEquatable<T> (Added by C# 2.0.)

IFormatProvider

IFormattable

IServiceProvider

  

System defines the following delegates:

Action<T> (Added by C# 2.0.)

AppDomainInitializer (Added by C# 2.0.)

AssemblyLoadEventHandler

AsyncCallback

Comparison<T> (Added by C# 2.0.)

ConsoleCancelEventHandler (Added by C# 2.0.)

Converter<T, V> (Added by C# 2.0.)

CrossAppDomainDelegate

EventHandler

EventHandler<T> (Added by C# 2.0.)

Predicate<T> (Added by C# 2.0.)

ResolveEventHandler

UnhandledExceptionEventHandler

  

System defines these enumerations:

ActivationContext.contextForm (Added by C# 2.0.)

AppDomainManagerInitializationOptions (Added by C# 2.0.)

AttributeTargets

Base64FormattingOptions (Added by C# 2.0.)

ConsoleColor (Added by C# 2.0.)

ConsoleKey (Added by C# 2.0.)

ConsoleModifiers (Added by C# 2.0.)

ConsoleSpecialKey (Added by C# 2.0.)

DateTimeKind (Added by C# 2.0.)

DayOfWeek

Environment.SpecialFolder

EnvironmentVariableTarget (Added by C# 2.0.)

GenericUriParserOptions (Added by C# 2.0.)

LoaderOptimization

MidpointRounding (Added by C# 2.0.)

PlatformID

StringComparison (Added by C# 2.0.)

StringSplitOptions (Added by C# 2.0.)

TypeCode

UriComponents (Added by C# 2.0.)

UriFormat (Added by C# 2.0.)

UriHostNameType

UriKind (Added by C# 2.0.)

UriPartial

As the preceding tables show, System is quite large. It is not possible to examine all of its constituents in detail in a single chapter. Furthermore, several of System’s members, such as Nullable<T>, Type, Exception, and Attribute, are discussed in Part I or elsewhere in this book. Finally, because System.String, which defines the C# string type, is such a large and important topic, it is covered in Chapter 21 along with formatting. For these reasons, this chapter explores only those members that are most commonly used by C# programmers and that are not fully covered elsewhere.




C# 2.0(c) The Complete Reference
C# 2.0: The Complete Reference (Complete Reference Series)
ISBN: 0072262095
EAN: 2147483647
Year: 2006
Pages: 300

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