The System namespace contains the fundamental types of the runtime, including the Object, Int32, and String types. [Edit]

Remarks

The System namespace contains the fundamental types of the runtime.

[Edit]

Classes

Type	Reason
AccessViolationException	Exception for permission access violations.
ActivationContext	Documentation for this section has not yet been entered.
Activator	This lets you create instances of an object given the Type of that object.
AppDomain	Represents an application domain, which is an isolated environment where applications execute.
AppDomainManager	Documentation for this section has not yet been entered.
AppDomainSetup	Documentation for this section has not yet been entered.
AppDomainUnloadedException	Documentation for this section has not yet been entered.
ApplicationException	ApplicationException is the base class for all exceptions defined by applications.
ApplicationId	Documentation for this section has not yet been entered.
ApplicationIdentity	Documentation for this section has not yet been entered.
ArgumentException	Represents the error that occurs when an argument passed to a method is invalid.
ArgumentNullException	Represents the error that occurs when an argument passed to a method is invalid because it is null .
ArgumentOutOfRangeException	Represents the error that occurs when an argument passed to a method is invalid because it is outside the allowable range of values as specified by the method.
ArithmeticException	Represents an error caused by an arithmetic operation.
Array	Serves as the base class for arrays. Provides methods for creating, copying, manipulating, searching, and sorting arrays.
ArrayTypeMismatchException	Represents the error that occurs when an attempt is made to store an element of the wrong type in an array.
AssemblyLoadEventArgs	Provides access to the System.Reflection.Assembly that was loaded causing a AppDomain.AssemblyLoad event.
Attribute	Serves as the base class for custom attributes.
AttributeUsageAttribute	Specifies the behavior of a custom attribute when that attribute is defined.
BadImageFormatException	Represents the error that occurs when an attempt is made to load a System.Reflection.Assembly from a file with an invalid file image.
BitConverter	Use BitConverter class to work with binary representations of value types.
Buffer	A low level array manipulation class. Allows bytewise reading and writing on the primitive types contained in an array.
CannotUnloadAppDomainException	Represents the error that occurs when an attempt to unload an application domain fails.
CharEnumerator	Supports iteration over and provides read-only access to the individual characters in a string.
CLSCompliantAttribute	Indicates whether the target of the current attribute complies with the Common Language Specification (CLS).
Console	Represents the standard input, output, and error streams for console applications.
ConsoleCancelEventArgs	Context passed to a handler on interruption, allows termination of an application.
ContextBoundObject	Documentation for this section has not yet been entered.
ContextMarshalException	Documentation for this section has not yet been entered.
ContextStaticAttribute	Documentation for this section has not yet been entered.
Convert	Performs conversions between base data types.
DataMisalignedException	Documentation for this section has not yet been entered.
DBNull	System representation of a database null.
Delegate	A class used to create types that invoke methods.
DivideByZeroException	Represents the error that is caused by an attempt to divide a number by zero.
DllNotFoundException	Thrown when a DLL specified in a DLLImport isn't found.
DuplicateWaitObjectException	Represents the error that occurs when an object appears more than once in an array of System.Threading.WaitHandle instances.
EntryPointNotFoundException	Represents the error that occurs when an attempt to load a System.Reflection.Assembly fails due to the absence of an entry point.
Environment	Provides the current settings for, and information about, the execution environment.
EventArgs	EventArgs is the base class for classes containing event data.
Exception	Represents errors that occur during application execution.
ExecutionEngineException	Represents an internal error in the execution engine.
FieldAccessException	Represents the error that occurs when there is an attempt to access a field outside the scope in which access is permitted.
FileStyleUriParser	Documentation for this section has not yet been entered.
FlagsAttribute	Indicates that the Enum targeted by the current attribute is declared as a bit-field.
FormatException	Represents errors caused by passing incorrectly formatted arguments or invalid format specifiers to methods.
FtpStyleUriParser	Documentation for this section has not yet been entered.
GC	Provides a mechanism for programmatic control of the garbage collector.
GenericUriParser	Documentation for this section has not yet been entered.
GopherStyleUriParser	Documentation for this section has not yet been entered.
HttpStyleUriParser	Documentation for this section has not yet been entered.
IndexOutOfRangeException	Represents the error that occurs when an attempt is made to access an element of an array with an index that is outside the bounds of the array.
InsufficientMemoryException	Documentation for this section has not yet been entered.
InvalidCastException	Represents the error that occurs when an explicit conversion (casting operation) fails because the source type cannot be converted to the destination type.
InvalidOperationException	Represents the error that occurs when an operation cannot be performed.
InvalidProgramException	Represents the error that occurs when a program contains invalid CIL instructions or metadata.
InvalidTimeZoneException	Documentation for this section has not yet been entered.
LdapStyleUriParser	Documentation for this section has not yet been entered.
LoaderOptimizationAttribute	Used to set the desired optimizations for a given method.
LocalDataStoreSlot	Documentation for this section has not yet been entered.
MarshalByRefObject	Enables access to objects across application domain boundaries in implementations that support remoting.
Math	Provides constants and static methods for trigonometric, logarithmic, and other common mathematical functions.
MemberAccessException	MemberAccessException is the base class for exceptions that occurs when an attempt to locate or access a type member fails.
MethodAccessException	Represents the error that occurs when there is an attempt to access a method outside the scope in which access is permitted.
MissingFieldException	Represents the error that occurs when there is an attempt to dynamically access a field that does not exist.
MissingMemberException	Represents the error that occurs when there is an attempt to dynamically access a class member that does not exist.
MissingMethodException	Represents the error that occurs when there is an attempt to dynamically access a method that does not exist.
MTAThreadAttribute	This attribute is used to flag the method as using the MultiThreaded Apartment model.
MulticastNotSupportedException	Documentation for this section has not yet been entered.
NetPipeStyleUriParser	Documentation for this section has not yet been entered.
NetTcpStyleUriParser	Documentation for this section has not yet been entered.
NewsStyleUriParser	Documentation for this section has not yet been entered.
NonSerializedAttribute	This attribute is applied to fields in types that should not be serialized.
NotFiniteNumberException	Represents the error that occurs when an arithmetic operation cannot be performed on a floating-point value that is not a finite number.
NotImplementedException	Represents the error that occurs when a requested operation is not implemented for a given type.
NotSupportedException	Represents the error that occurs when an object cannot perform an operation.
Nullable	Documentation for this section has not yet been entered.
NullReferenceException	Represents the error that occurs when there is an attempt to dereference a null object reference.
Object	Provides support for classes. This class is the root of the object hierarchy.
ObjectDisposedException	Represents the error that occurs when an operation is performed on a disposed object.
ObsoleteAttribute	Indicates that the target of the current attribute will be removed in future versions of the assembly in which the target is contained.
OperatingSystem	Represents the details of an Operating System.
OperationCanceledException	Documentation for this section has not yet been entered.
OutOfMemoryException	Represents the error that occurs when insufficient memory prevents the current memory allocation from succeeding.
OverflowException	Represents the error that occurs when the result of an arithmetic operation is too large to be represented by the destination type.
ParamArrayAttribute	Indicates that a method allows a variable number of arguments in its invocation.
PlatformNotSupportedException	Documentation for this section has not yet been entered.
Random	Generates psuedo-random numbers.
RankException	Represents the error that occurs when an array with an incorrect number of dimensions is passed to a method.
ResolveEventArgs	Documentation for this section has not yet been entered.
SerializableAttribute	Marks a type as being serializable.
StackOverflowException	Represents the error that occurs when the execution stack overflows due to too many method calls.
STAThreadAttribute	This attribute is used to flag the method as using the Single Threaded Apartment model.
String	Represents an immutable series of characters.
StringComparer	Documentation for this section has not yet been entered.
SystemException	SystemException is the base class for all exceptions defined by the system.
ThreadStaticAttribute	Indicates that there is a unique instance of the designated static field for each thread.
TimeoutException	Documentation for this section has not yet been entered.
TimeZone	Provides support for the differences in time from the time zone and UTC.
TimeZoneInfo	Documentation for this section has not yet been entered.
TimeZoneInfo.AdjustmentRule	Documentation for this section has not yet been entered.
TimeZoneNotFoundException	Documentation for this section has not yet been entered.
Type	Provides information about a type.
TypeInitializationException	Represents the error that occurs when an exception is thrown inside the static constructor of a type.
TypeLoadException	Represents the error that occurs when the system cannot load a Type.
TypeUnloadedException	Represents the error that occurs when there is an attempt to access a Type that has been unloaded.
UnauthorizedAccessException	Represents the error that occurs when an I/O operation cannot be performed because of incompatible file access levels.
UnhandledExceptionEventArgs	Provides data for the event that is raised when an exception is not caught by the program code executing in an application domain.
Uri	Provides an object representation of a uniform resource identifier (URI) as defined by IETF RFC 2396.
UriBuilder	Provides a mutable version of the Uri class.
UriFormatException	Represents the error that occurs when a Uniform Resource Identifier (URI) is not correctly formatted.
UriParser	Documentation for this section has not yet been entered.
UriTypeConverter	Documentation for this section has not yet been entered.
ValueType	Provides support for value types. This class is the base class for all value types.
Version	Represents the version number of an assembly.
WeakReference	A weak reference holds a reference to another object but does not prevent the object from being garbage collected.

Interfaces

Type	Reason
_AppDomain	Documentation for this section has not yet been entered.
IAppDomainSetup	Documentation for this section has not yet been entered.
IAsyncResult	Supported by objects that represent the state of an asynchronous operation.
ICloneable	Implemented by classes that require control over the way in which copies of instances are constructed.
IComparable	Implemented by classes that support an ordering of instances of the class.
IComparable<T>	Defines generalized comparison methods that a value type or class implements to create a type-specific comparison method.
IConvertible	Documentation for this section has not yet been entered.
ICustomFormatter	Documentation for this section has not yet been entered.
IDisposable	Implemented by classes that require explicit control over resource cleanup.
IEquatable<T>	Defines generalized equality methods that a value type or class implements to create a type-specific equality method.
IFormatProvider	Implemented by classes that supply objects that provide formatting services.
IFormattable	Implemented by classes that construct customizable string representations of objects.
IServiceProvider	This interface is used to query for instances of objects based on a Type.

Structs

Type	Reason
ArgIterator	This class is used to acess variable arguments on methods that use the __arglist calling convention.
ArraySegment<T>	Documentation for this section has not yet been entered.
Boolean	Represents a Boolean value.
Byte	Represents an 8-bit unsigned integer.
Char	Represents a Unicode character.
ConsoleKeyInfo	Documentation for this section has not yet been entered.
DateTime	Represents an instant in time, expressed as a date and time of day.
DateTimeOffset	Documentation for this section has not yet been entered.
Decimal	Represents a floating-point decimal data type with at least 28 significant digits, suitable for financial and commercial calculations.
Double	Represents a 64-bit double-precision floating-point number.
Enum	Provides support for all enumeration types. Serves as the base class for all enumeration types.
Guid	A globally-unique identifier.
Int16	Represents a 16-bit signed integer.
Int32	Represents a 32-bit signed integer.
Int64	Represents a 64-bit signed integer.
IntPtr	An implementation-specific type that is used to represent a pointer or a handle.
ModuleHandle	Documentation for this section has not yet been entered.
Nullable<T>	Represents a nullable value type. An instance of Nullable<T>can contain a value of type T or an indication that the instance contains no value. Upon boxing, if it contains no value, it will be converted to the null reference; otherwise, it will be converted to a boxed T. [Note: Because of the constraint on the generic parameter, T cannot be of type Nullable<U> for any U. end note]
RuntimeArgumentHandle	A handle that represents a variable-length argument list.
RuntimeFieldHandle	Serves as a metadata token for a field.
RuntimeMethodHandle	The RuntimeMethodHandle is a handle to the internal metadata representation of a method.
RuntimeTypeHandle	Provides a handle to the internal metadata representation of a type.
SByte	Represents an 8-bit signed integer.
Single	Represents a 32-bit single-precision floating-point number.
TimeSpan	Represents an interval of time.
TimeZoneInfo.TransitionTime	Documentation for this section has not yet been entered.
TypedReference	Describes an object that contains both a managed pointer to a location and a runtime representation of the type that can be stored at that location.
UInt16	Represents a 16-bit unsigned integer.
UInt32	Represents a 32-bit unsigned integer.
UInt64	Represents a 64-bit unsigned integer.
UIntPtr	An implementation-specific type that is used to represent a pointer or a handle.
Void	Indicates a method that does not return a value; that is, the method has a return type of void .

Delegates

Type	Reason
Action	Documentation for this section has not yet been entered.
Action<T>	A delegate to a method that returns no values, and takes one parameter.
Action<T1,T2,T3,T4>	Documentation for this section has not yet been entered.
Action<T1,T2,T3>	Documentation for this section has not yet been entered.
Action<T1,T2>	Documentation for this section has not yet been entered.
AppDomainInitializer	Documentation for this section has not yet been entered.
AssemblyLoadEventHandler	Defines the methods that are called in response to AppDomain.AssemblyLoad events.
AsyncCallback	References one or more methods called when an asynchronous operation completes.
Comparison<T>	Represents the method that compares two objects of the same type.
ConsoleCancelEventHandler	Documentation for this section has not yet been entered.
Converter<TInput,TOutput>	Represents the method that converts an object from one type to another.
CrossAppDomainDelegate	Documentation for this section has not yet been entered.
EventHandler	Defines the shape of methods that are called in response to an event.
EventHandler<TEventArgs>	Documentation for this section has not yet been entered.
Func<T,TResult>	Documentation for this section has not yet been entered.
Func<T1,T2,T3,T4,TResult>	Documentation for this section has not yet been entered.
Func<T1,T2,T3,TResult>	Documentation for this section has not yet been entered.
Func<T1,T2,TResult>	Documentation for this section has not yet been entered.
Func<TResult>	Documentation for this section has not yet been entered.
MulticastDelegate	Documentation for this section has not yet been entered.
Predicate<T>	Represents the method that defines a Boolean query on an object.
ResolveEventHandler	Signature for various events emitted by the AppDomain.
UnhandledExceptionEventHandler	Defines the shape of methods that handle the event that is raised by the system for uncaught exceptions.

Enumerations

Type	Reason
ActivationContext.ContextForm	Documentation for this section has not yet been entered.
AppDomainManagerInitializationOptions	Documentation for this section has not yet been entered.
AttributeTargets	Enumerates the application elements to which it is valid to attach an attribute.
Base64FormattingOptions	Documentation for this section has not yet been entered.
ConsoleColor	Documentation for this section has not yet been entered.
ConsoleKey	Documentation for this section has not yet been entered.
ConsoleModifiers	Documentation for this section has not yet been entered.
ConsoleSpecialKey	Documentation for this section has not yet been entered.
DateTimeKind	Documentation for this section has not yet been entered.
DayOfWeek	Enumeration of all days of a week.
Environment.SpecialFolder	An enumeration of common directories on the file system.
EnvironmentVariableTarget	Documentation for this section has not yet been entered.
GCCollectionMode	Documentation for this section has not yet been entered.
GenericUriParserOptions	Documentation for this section has not yet been entered.
LoaderOptimization	These values are used in AppDomainSetup to control the way code is JITed. As of Mono 1.1.9 the values are not used.
MidpointRounding	Documentation for this section has not yet been entered.
PlatformID	Represents the Platform of the OperatingSystem.
StringComparison	Documentation for this section has not yet been entered.
StringSplitOptions	Documentation for this section has not yet been entered.
TypeCode	Specifies what type an object is of.
UriComponents	Documentation for this section has not yet been entered.
UriFormat	Documentation for this section has not yet been entered.
UriHostNameType	Specifies the format of host names.
UriIdnScope	Documentation for this section has not yet been entered.
UriKind	Documentation for this section has not yet been entered.
UriPartial	Specifies URI components.