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System
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System Namespace

The System namespace contains fundamental classes and base classes that define commonly-used value and reference data types, events and event handlers, interfaces, attributes, and processing exceptions.

Other classes provide services supporting data type conversion, method parameter manipulation, mathematics, remote and local program invocation, application environment management, and supervision of managed and unmanaged applications.

  Class Description
Public class AccessViolationException The exception that is thrown when there is an attempt to read or write protected memory.
Public class ActivationContext Identifies the activation context for the current application. This class cannot be inherited.
Public class Supported by Portable Class Library Activator Contains methods to create types of objects locally or remotely, or obtain references to existing remote objects. This class cannot be inherited.
Public class Supported by Portable Class Library AggregateException Represents one or more errors that occur during application execution.
Public class AppContext Provides members for setting and retrieving data about an application's context.
Public class AppDomain Represents an application domain, which is an isolated environment where applications execute. This class cannot be inherited.
Public class AppDomainManager Provides a managed equivalent of an unmanaged host.
Public class AppDomainSetup Represents assembly binding information that can be added to an instance of AppDomain.
Public class AppDomainUnloadedException The exception that is thrown when an attempt is made to access an unloaded application domain.
Public class ApplicationException Serves as the base class for application-defined exceptions.
Public class ApplicationId Contains information used to uniquely identify a manifest-based application. This class cannot be inherited.
Public class ApplicationIdentity Provides the ability to uniquely identify a manifest-activated application. This class cannot be inherited.
Public class Supported by Portable Class Library ArgumentException The exception that is thrown when one of the arguments provided to a method is not valid.
Public class Supported by Portable Class Library ArgumentNullException The exception that is thrown when a null reference (Nothing in Visual Basic) is passed to a method that does not accept it as a valid argument.
Public class Supported by Portable Class Library ArgumentOutOfRangeException The exception that is thrown when the value of an argument is outside the allowable range of values as defined by the invoked method.
Public class Supported by Portable Class Library ArithmeticException The exception that is thrown for errors in an arithmetic, casting, or conversion operation.
Public class Supported by Portable Class Library Array Provides methods for creating, manipulating, searching, and sorting arrays, thereby serving as the base class for all arrays in the common language runtime.To browse the .NET Framework source code for this type, see the Reference Source.
Public class Supported by Portable Class Library ArrayTypeMismatchException The exception that is thrown when an attempt is made to store an element of the wrong type within an array.
Public class AssemblyLoadEventArgs Provides data for the AssemblyLoad event.
Public class Supported by Portable Class Library Attribute Represents the base class for custom attributes.
Public class Supported by Portable Class Library AttributeUsageAttribute Specifies the usage of another attribute class. This class cannot be inherited.
Public class Supported by Portable Class Library BadImageFormatException The exception that is thrown when the file image of a dynamic link library (DLL) or an executable program is invalid.
Public class Supported by Portable Class Library BitConverter Converts base data types to an array of bytes, and an array of bytes to base data types.
Public class Supported by Portable Class Library Buffer Manipulates arrays of primitive types.
Public class CannotUnloadAppDomainException The exception that is thrown when an attempt to unload an application domain fails.
Public class CharEnumerator Supports iterating over a String object and reading its individual characters. This class cannot be inherited.
Public class Supported by Portable Class Library CLSCompliantAttribute Indicates whether a program element is compliant with the Common Language Specification (CLS). This class cannot be inherited.
Public class Console Represents the standard input, output, and error streams for console applications. This class cannot be inherited.To browse the .NET Framework source code for this type, see the Reference Source.
Public class ConsoleCancelEventArgs Provides data for the Console.CancelKeyPress event. This class cannot be inherited.
Public class ContextBoundObject Defines the base class for all context-bound classes.
Public class ContextMarshalException The exception that is thrown when an attempt to marshal an object across a context boundary fails.
Public class ContextStaticAttribute Indicates that the value of a static field is unique for a particular context.
Public class Supported by Portable Class Library Convert Converts a base data type to another base data type.
Public class Supported by Portable Class Library DataMisalignedException The exception that is thrown when a unit of data is read from or written to an address that is not a multiple of the data size. This class cannot be inherited.
Public class DBNull Represents a nonexistent value. This class cannot be inherited.
Public class Supported by Portable Class Library Delegate Represents a delegate, which is a data structure that refers to a static method or to a class instance and an instance method of that class.
Public class Supported by Portable Class Library DivideByZeroException The exception that is thrown when there is an attempt to divide an integral or decimal value by zero.
Public class Supported by Portable Class Library DllNotFoundException The exception that is thrown when a DLL specified in a DLL import cannot be found.
Public class DuplicateWaitObjectException The exception that is thrown when an object appears more than once in an array of synchronization objects.
Public class EntryPointNotFoundException The exception that is thrown when an attempt to load a class fails due to the absence of an entry method.
Public class Supported by Portable Class Library Enum Provides the base class for enumerations.
Public class Supported by Portable Class Library Environment Provides information about, and means to manipulate, the current environment and platform. This class cannot be inherited.
Public class Supported by Portable Class Library EventArgs Represents the base class for classes that contain event data, and provides a value to use for events that do not include event data.
Public class Supported by Portable Class Library Exception Represents errors that occur during application execution.To browse the .NET Framework source code for this type, see the Reference Source.
Public class ExecutionEngineException Obsolete. The exception that is thrown when there is an internal error in the execution engine of the common language runtime. This class cannot be inherited.
Public class FieldAccessException The exception that is thrown when there is an invalid attempt to access a private or protected field inside a class.
Public class FileStyleUriParser A customizable parser based on the File scheme.
Public class Supported by Portable Class Library FlagsAttribute Indicates that an enumeration can be treated as a bit field; that is, a set of flags.
Public class Supported by Portable Class Library FormatException The exception that is thrown when the format of an argument is invalid, or when a composite format string is not well formed.
Public class FormattableString Represents a composite format string, along with the arguments to be formatted.
Public class FtpStyleUriParser A customizable parser based on the File Transfer Protocol (FTP) scheme.
Public class Supported by Portable Class Library GC Controls the system garbage collector, a service that automatically reclaims unused memory.
Public class GenericUriParser A customizable parser for a hierarchical URI.
Public class GopherStyleUriParser A customizable parser based on the Gopher scheme.
Public class HttpStyleUriParser A customizable parser based on the HTTP scheme.
Public class Supported by Portable Class Library IndexOutOfRangeException The exception that is thrown when an attempt is made to access an element of an array or collection with an index that is outside its bounds.
Public class InsufficientExecutionStackException The exception that is thrown when there is insufficient execution stack available to allow most methods to execute.
Public class InsufficientMemoryException The exception that is thrown when a check for sufficient available memory fails. This class cannot be inherited.
Public class Supported by Portable Class Library InvalidCastException The exception that is thrown for invalid casting or explicit conversion.
Public class Supported by Portable Class Library InvalidOperationException The exception that is thrown when a method call is invalid for the object's current state.
Public class InvalidProgramException The exception that is thrown when a program contains invalid Microsoft intermediate language (MSIL) or metadata. Generally this indicates a bug in the compiler that generated the program.
Public class Supported by Portable Class Library InvalidTimeZoneException The exception that is thrown when time zone information is invalid.
Public class Supported by Portable Class Library Lazy<T> Provides support for lazy initialization.
Public class Supported by Portable Class Library Lazy<T, TMetadata> Provides a lazy indirect reference to an object and its associated metadata for use by the Managed Extensibility Framework.
Public class LdapStyleUriParser A customizable parser based on the Lightweight Directory Access Protocol (LDAP) scheme.
Public class LoaderOptimizationAttribute Used to set the default loader optimization policy for the main method of an executable application.
Public class LocalDataStoreSlot Encapsulates a memory slot to store local data. This class cannot be inherited.
Public class MarshalByRefObject Enables access to objects across application domain boundaries in applications that support remoting.
Public class Supported by Portable Class Library Math Provides constants and static methods for trigonometric, logarithmic, and other common mathematical functions.To browse the .NET Framework source code for this type, see the Reference Source.
Public class Supported by Portable Class Library MemberAccessException The exception that is thrown when an attempt to access a class member fails.
Public class MethodAccessException The exception that is thrown when there is an invalid attempt to access a method, such as accessing a private method from partially trusted code.
Public class MissingFieldException The exception that is thrown when there is an attempt to dynamically access a field that does not exist.
Public class Supported by Portable Class Library MissingMemberException The exception that is thrown when there is an attempt to dynamically access a class member that does not exist.
Public class MissingMethodException The exception that is thrown when there is an attempt to dynamically access a method that does not exist.
Public class MTAThreadAttribute Indicates that the COM threading model for an application is multithreaded apartment (MTA).
Public class Supported by Portable Class Library MulticastDelegate Represents a multicast delegate; that is, a delegate that can have more than one element in its invocation list.
Public class MulticastNotSupportedException The exception that is thrown when there is an attempt to combine two delegates based on the Delegate type instead of the MulticastDelegate type. This class cannot be inherited.
Public class NetPipeStyleUriParser A parser based on the NetPipe scheme for the "Indigo" system.
Public class NetTcpStyleUriParser A parser based on the NetTcp scheme for the "Indigo" system.
Public class NewsStyleUriParser A customizable parser based on the news scheme using the Network News Transfer Protocol (NNTP).
Public class NonSerializedAttribute Indicates that a field of a serializable class should not be serialized. This class cannot be inherited.
Public class NotFiniteNumberException The exception that is thrown when a floating-point value is positive infinity, negative infinity, or Not-a-Number (NaN).
Public class Supported by Portable Class Library NotImplementedException The exception that is thrown when a requested method or operation is not implemented.
Public class Supported by Portable Class Library NotSupportedException The exception that is thrown when an invoked method is not supported, or when there is an attempt to read, seek, or write to a stream that does not support the invoked functionality.
Public class Supported by Portable Class Library Nullable Supports a value type that can be assigned null. This class cannot be inherited.
Public class Supported by Portable Class Library NullReferenceException The exception that is thrown when there is an attempt to dereference a null object reference.
Public class Supported by Portable Class Library Object Supports all classes in the .NET Framework class hierarchy and provides low-level services to derived classes. This is the ultimate base class of all classes in the .NET Framework; it is the root of the type hierarchy.To browse the .NET Framework source code for this type, see the Reference Source.
Public class Supported by Portable Class Library ObjectDisposedException The exception that is thrown when an operation is performed on a disposed object.
Public class Supported by Portable Class Library ObsoleteAttribute Marks the program elements that are no longer in use. This class cannot be inherited.
Public class OperatingSystem Represents information about an operating system, such as the version and platform identifier. This class cannot be inherited.
Public class Supported by Portable Class Library OperationCanceledException The exception that is thrown in a thread upon cancellation of an operation that the thread was executing.
Public class Supported by Portable Class Library OutOfMemoryException The exception that is thrown when there is not enough memory to continue the execution of a program.
Public class Supported by Portable Class Library OverflowException The exception that is thrown when an arithmetic, casting, or conversion operation in a checked context results in an overflow.
Public class Supported by Portable Class Library ParamArrayAttribute Indicates that a method will allow a variable number of arguments in its invocation. This class cannot be inherited.
Public class Supported by Portable Class Library PlatformNotSupportedException The exception that is thrown when a feature does not run on a particular platform.
Public class Progress<T> Provides an IProgress<T> that invokes callbacks for each reported progress value.
Public class Supported by Portable Class Library Random Represents a pseudo-random number generator, which is a device that produces a sequence of numbers that meet certain statistical requirements for randomness.To browse the .NET Framework source code for this type, see the Reference Source.
Public class Supported by Portable Class Library RankException The exception that is thrown when an array with the wrong number of dimensions is passed to a method.
Public class ResolveEventArgs Provides data for loader resolution events, such as the TypeResolve, ResourceResolve, ReflectionOnlyAssemblyResolve, and AssemblyResolve events.
Public class SerializableAttribute Indicates that a class can be serialized. This class cannot be inherited.
Public class StackOverflowException The exception that is thrown when the execution stack overflows because it contains too many nested method calls. This class cannot be inherited.
Public class STAThreadAttribute Indicates that the COM threading model for an application is single-threaded apartment (STA).
Public class Supported by Portable Class Library String Represents text as a series of Unicode characters.To browse the .NET Framework source code for this type, see the Reference Source.
Public class Supported by Portable Class Library StringComparer Represents a string comparison operation that uses specific case and culture-based or ordinal comparison rules.
Public class SystemException Serves as the base class for system exceptions namespace.
Public class Supported by Portable Class Library ThreadStaticAttribute Indicates that the value of a static field is unique for each thread.
Public class Supported by Portable Class Library TimeoutException The exception that is thrown when the time allotted for a process or operation has expired.
Public class TimeZone Represents a time zone.
Public class Supported by Portable Class Library TimeZoneInfo Represents any time zone in the world.
Public class TimeZoneInfo.AdjustmentRule Provides information about a time zone adjustment, such as the transition to and from daylight saving time.
Public class TimeZoneNotFoundException The exception that is thrown when a time zone cannot be found.
Public class Supported by Portable Class Library Tuple Provides static methods for creating tuple objects. To browse the .NET Framework source code for this type, see the Reference Source.
Public class Supported by Portable Class Library Tuple<T1> Represents a 1-tuple, or singleton.
Public class Supported by Portable Class Library Tuple<T1, T2> Represents a 2-tuple, or pair.
Public class Supported by Portable Class Library Tuple<T1, T2, T3> Represents a 3-tuple, or triple.
Public class Supported by Portable Class Library Tuple<T1, T2, T3, T4> Represents a 4-tuple, or quadruple.
Public class Supported by Portable Class Library Tuple<T1, T2, T3, T4, T5> Represents a 5-tuple, or quintuple.
Public class Supported by Portable Class Library Tuple<T1, T2, T3, T4, T5, T6> Represents a 6-tuple, or sextuple.
Public class Supported by Portable Class Library Tuple<T1, T2, T3, T4, T5, T6, T7> Represents a 7-tuple, or septuple.
Public class Supported by Portable Class Library Tuple<T1, T2, T3, T4, T5, T6, T7, TRest> Represents an n-tuple, where n is 8 or greater.
Public class Supported by Portable Class Library Type Represents type declarations: class types, interface types, array types, value types, enumeration types, type parameters, generic type definitions, and open or closed constructed generic types.To browse the .NET Framework source code for this type, see the Reference Source.
Public class Supported by Portable Class Library TypeAccessException The exception that is thrown when a method attempts to use a type that it does not have access to.
Public class Supported by Portable Class Library TypeInitializationException The exception that is thrown as a wrapper around the exception thrown by the class initializer. This class cannot be inherited.
Public class Supported by Portable Class Library TypeLoadException The exception that is thrown when type-loading failures occur.
Public class TypeUnloadedException The exception that is thrown when there is an attempt to access an unloaded class.
Public class Supported by Portable Class Library UnauthorizedAccessException The exception that is thrown when the operating system denies access because of an I/O error or a specific type of security error.
Public class UnhandledExceptionEventArgs Provides data for the event that is raised when there is an exception that is not handled in any application domain.
Public class Supported by Portable Class Library Uri Provides an object representation of a uniform resource identifier (URI) and easy access to the parts of the URI.
Public class Supported by Portable Class Library UriBuilder Provides a custom constructor for uniform resource identifiers (URIs) and modifies URIs for the Uri class.
Public class UriFormatException The exception that is thrown when an invalid Uniform Resource Identifier (URI) is detected.
Public class UriParser Parses a new URI scheme. This is an abstract class.
Public class UriTemplate A class that represents a Uniform Resource Identifier (URI) template.
Public class UriTemplateEquivalenceComparer A class used to compare UriTemplate instances for structural (instead of reference) equivalence.
Public class UriTemplateMatch A class that represents the results of a match operation on a UriTemplate instance.
Public class UriTemplateMatchException Represents an error when matching a Uri to a UriTemplateTable.
Public class UriTemplateTable A class that represents an associative set of UriTemplate objects.
Public class UriTypeConverter Converts a String type to a Uri type, and vice versa.
Public class Supported by Portable Class Library ValueType Provides the base class for value types.
Public class Supported by Portable Class Library Version Represents the version number of an assembly, operating system, or the common language runtime. This class cannot be inherited.
Public class Supported by Portable Class Library WeakReference Represents a weak reference, which references an object while still allowing that object to be reclaimed by garbage collection.
Public class WeakReference<T> Represents a typed weak reference, which references an object while still allowing that object to be reclaimed by garbage collection.
Public class WindowsRuntimeSystemExtensions Provides extension methods for converting between tasks and Windows Runtime asynchronous actions and operations.

  Structure Description
Public structure ArgIterator Represents a variable-length argument list; that is, the parameters of a function that takes a variable number of arguments.
Public structure Supported by Portable Class Library ArraySegment<T> Delimits a section of a one-dimensional array.
Public structure Supported by Portable Class Library Boolean Represents a Boolean (true or false) value.
Public structure Supported by Portable Class Library Byte Represents an 8-bit unsigned integer.
Public structure Supported by Portable Class Library Char Represents a character as a UTF-16 code unit.
Public structure ConsoleKeyInfo Describes the console key that was pressed, including the character represented by the console key and the state of the SHIFT, ALT, and CTRL modifier keys.
Public structure Supported by Portable Class Library DateTime Represents an instant in time, typically expressed as a date and time of day. To browse the .NET Framework source code for this type, see the Reference Source.
Public structure Supported by Portable Class Library DateTimeOffset Represents a point in time, typically expressed as a date and time of day, relative to Coordinated Universal Time (UTC).
Public structure Supported by Portable Class Library Decimal Represents a decimal number.
Public structure Supported by Portable Class Library Double Represents a double-precision floating-point number.
Public structure Supported by Portable Class Library Guid Represents a globally unique identifier (GUID).To browse the .NET Framework source code for this type, see the Reference Source.
Public structure Supported by Portable Class Library Int16 Represents a 16-bit signed integer.
Public structure Supported by Portable Class Library Int32 Represents a 32-bit signed integer.To browse the .NET Framework source code for this type, see the Reference Source.
Public structure Supported by Portable Class Library Int64 Represents a 64-bit signed integer.
Public structure Supported by Portable Class Library IntPtr A platform-specific type that is used to represent a pointer or a handle.
Public structure ModuleHandle Represents a runtime handle for a module.
Public structure Supported by Portable Class Library Nullable<T> Represents a value type that can be assigned null.
Public structure RuntimeArgumentHandle References a variable-length argument list.
Public structure Supported by Portable Class Library RuntimeFieldHandle Represents a field using an internal metadata token.
Public structure Supported by Portable Class Library RuntimeMethodHandle RuntimeMethodHandle is a handle to the internal metadata representation of a method.
Public structure Supported by Portable Class Library RuntimeTypeHandle Represents a type using an internal metadata token.
Public structure Supported by Portable Class Library SByte Represents an 8-bit signed integer.
Public structure Supported by Portable Class Library Single Represents a single-precision floating-point number.
Public structure Supported by Portable Class Library TimeSpan Represents a time interval.To browse the .NET Framework source code for this type, see the Reference Source.
Public structure TimeZoneInfo.TransitionTime Provides information about a specific time change, such as the change from daylight saving time to standard time or vice versa, in a particular time zone.
Public structure TypedReference Describes objects that contain both a managed pointer to a location and a runtime representation of the type that may be stored at that location.
Public structure Supported by Portable Class Library UInt16 Represents a 16-bit unsigned integer.
Public structure Supported by Portable Class Library UInt32 Represents a 32-bit unsigned integer.
Public structure Supported by Portable Class Library UInt64 Represents a 64-bit unsigned integer.
Public structure Supported by Portable Class Library UIntPtr A platform-specific type that is used to represent a pointer or a handle.
Public structure Supported by Portable Class Library Void Specifies a return value type for a method that does not return a value.

  Interface Description
Public interface _AppDomain Exposes the public members of the System.AppDomain class to unmanaged code.
Public interface IAppDomainSetup Represents assembly binding information that can be added to an instance of AppDomain.
Public interface Supported by Portable Class Library IAsyncResult Represents the status of an asynchronous operation.
Public interface ICloneable Supports cloning, which creates a new instance of a class with the same value as an existing instance.
Public interface Supported by Portable Class Library IComparable Defines a generalized type-specific comparison method that a value type or class implements to order or sort its instances.
Public interface Supported by Portable Class Library IComparable<T> Defines a generalized comparison method that a value type or class implements to create a type-specific comparison method for ordering or sorting its instances.
Public interface Supported by Portable Class Library IConvertible Defines methods that convert the value of the implementing reference or value type to a common language runtime type that has an equivalent value.
Public interface Supported by Portable Class Library ICustomFormatter Defines a method that supports custom formatting of the value of an object.
Public interface Supported by Portable Class Library IDisposable Provides a mechanism for releasing unmanaged resources.To browse the .NET Framework source code for this type, see the Reference Source.
Public interface Supported by Portable Class Library IEquatable<T> Defines a generalized method that a value type or class implements to create a type-specific method for determining equality of instances.
Public interface Supported by Portable Class Library IFormatProvider Provides a mechanism for retrieving an object to control formatting.
Public interface Supported by Portable Class Library IFormattable Provides functionality to format the value of an object into a string representation.
Public interface Supported by Portable Class Library IObservable<T> Defines a provider for push-based notification.
Public interface Supported by Portable Class Library IObserver<T> Provides a mechanism for receiving push-based notifications.
Public interface IProgress<T> Defines a provider for progress updates.
Public interface Supported by Portable Class Library IServiceProvider Defines a mechanism for retrieving a service object; that is, an object that provides custom support to other objects.

  Delegate Description
Public delegate Supported by Portable Class Library Action Encapsulates a method that has no parameters and does not return a value.
Public delegate Supported by Portable Class Library Action<T> Encapsulates a method that has a single parameter and does not return a value.To browse the .NET Framework source code for this type, see the Reference Source.
Public delegate Supported by Portable Class Library Action<T1, T2> Encapsulates a method that has two parameters and does not return a value.
Public delegate Supported by Portable Class Library Action<T1, T2, T3> Encapsulates a method that has three parameters and does not return a value.
Public delegate Supported by Portable Class Library Action<T1, T2, T3, T4> Encapsulates a method that has four parameters and does not return a value.
Public delegate Supported by Portable Class Library Action<T1, T2, T3, T4, T5> Encapsulates a method that has five parameters and does not return a value.
Public delegate Supported by Portable Class Library Action<T1, T2, T3, T4, T5, T6> Encapsulates a method that has six parameters and does not return a value.
Public delegate Supported by Portable Class Library Action<T1, T2, T3, T4, T5, T6, T7> Encapsulates a method that has seven parameters and does not return a value.
Public delegate Supported by Portable Class Library Action<T1, T2, T3, T4, T5, T6, T7, T8> Encapsulates a method that has eight parameters and does not return a value.
Public delegate Supported by Portable Class Library Action<T1, T2, T3, T4, T5, T6, T7, T8, T9> Encapsulates a method that has nine parameters and does not return a value.
Public delegate Supported by Portable Class Library Action<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10> Encapsulates a method that has 10 parameters and does not return a value.
Public delegate Supported by Portable Class Library Action<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11> Encapsulates a method that has 11 parameters and does not return a value.
Public delegate Supported by Portable Class Library Action<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12> Encapsulates a method that has 12 parameters and does not return a value.
Public delegate Supported by Portable Class Library Action<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13> Encapsulates a method that has 13 parameters and does not return a value.
Public delegate Supported by Portable Class Library Action<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14> Encapsulates a method that has 14 parameters and does not return a value.
Public delegate Supported by Portable Class Library Action<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15> Encapsulates a method that has 15 parameters and does not return a value.
Public delegate Supported by Portable Class Library Action<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16> Encapsulates a method that has 16 parameters and does not return a value.
Public delegate AppDomainInitializer Represents the callback method to invoke when the application domain is initialized.
Public delegate AssemblyLoadEventHandler Represents the method that handles the AssemblyLoad event of an AppDomain.
Public delegate Supported by Portable Class Library AsyncCallback References a method to be called when a corresponding asynchronous operation completes.
Public delegate Supported by Portable Class Library Comparison<T> Represents the method that compares two objects of the same type.
Public delegate ConsoleCancelEventHandler Represents the method that will handle the CancelKeyPress event of a System.Console.
Public delegate Converter<TInput, TOutput> Represents a method that converts an object from one type to another type.
Public delegate CrossAppDomainDelegate Used by DoCallBack for cross-application domain calls.
Public delegate Supported by Portable Class Library EventHandler Represents the method that will handle an event that has no event data.
Public delegate Supported by Portable Class Library EventHandler<TEventArgs> Represents the method that will handle an event when the event provides data.
Public delegate Supported by Portable Class Library Func<TResult> Encapsulates a method that has no parameters and returns a value of the type specified by the TResult parameter.
Public delegate Supported by Portable Class Library Func<T, TResult> Encapsulates a method that has one parameter and returns a value of the type specified by the TResult parameter.To browse the .NET Framework source code for this type, see the Reference Source.
Public delegate Supported by Portable Class Library Func<T1, T2, TResult> Encapsulates a method that has two parameters and returns a value of the type specified by the TResult parameter.
Public delegate Supported by Portable Class Library Func<T1, T2, T3, TResult> Encapsulates a method that has three parameters and returns a value of the type specified by the TResult parameter.
Public delegate Supported by Portable Class Library Func<T1, T2, T3, T4, TResult> Encapsulates a method that has four parameters and returns a value of the type specified by the TResult parameter.
Public delegate Supported by Portable Class Library Func<T1, T2, T3, T4, T5, TResult> Encapsulates a method that has five parameters and returns a value of the type specified by the TResult parameter.
Public delegate Supported by Portable Class Library Func<T1, T2, T3, T4, T5, T6, TResult> Encapsulates a method that has six parameters and returns a value of the type specified by the TResult parameter.
Public delegate Supported by Portable Class Library Func<T1, T2, T3, T4, T5, T6, T7, TResult> Encapsulates a method that has seven parameters and returns a value of the type specified by the TResult parameter.
Public delegate Supported by Portable Class Library Func<T1, T2, T3, T4, T5, T6, T7, T8, TResult> Encapsulates a method that has eight parameters and returns a value of the type specified by the TResult parameter.
Public delegate Supported by Portable Class Library Func<T1, T2, T3, T4, T5, T6, T7, T8, T9, TResult> Encapsulates a method that has nine parameters and returns a value of the type specified by the TResult parameter.
Public delegate Supported by Portable Class Library Func<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, TResult> Encapsulates a method that has 10 parameters and returns a value of the type specified by the TResult parameter.
Public delegate Supported by Portable Class Library Func<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, TResult> Encapsulates a method that has 11 parameters and returns a value of the type specified by the TResult parameter.
Public delegate Supported by Portable Class Library Func<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, TResult> Encapsulates a method that has 12 parameters and returns a value of the type specified by the TResult parameter.
Public delegate Supported by Portable Class Library Func<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, TResult> Encapsulates a method that has 13 parameters and returns a value of the type specified by the TResult parameter.
Public delegate Supported by Portable Class Library Func<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, TResult> Encapsulates a method that has 14 parameters and returns a value of the type specified by the TResult parameter.
Public delegate Supported by Portable Class Library Func<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, TResult> Encapsulates a method that has 15 parameters and returns a value of the type specified by the TResult parameter.
Public delegate Supported by Portable Class Library Func<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, TResult> Encapsulates a method that has 16 parameters and returns a value of the type specified by the TResult parameter.
Public delegate Supported by Portable Class Library Predicate<T> Represents the method that defines a set of criteria and determines whether the specified object meets those criteria.
Public delegate ResolveEventHandler Represents a method that handles the AppDomain.TypeResolve, AppDomain.ResourceResolve, or AssemblyResolve event of an AppDomain.
Public delegate UnhandledExceptionEventHandler Represents the method that will handle the event raised by an exception that is not handled by the application domain.

  Enumeration Description
Public enumeration ActivationContext.ContextForm Indicates the context for a manifest-activated application.
Public enumeration AppDomainManagerInitializationOptions Specifies the action that a custom application domain manager takes when initializing a new domain.
Public enumeration Supported by Portable Class Library AttributeTargets Specifies the application elements on which it is valid to apply an attribute.
Public enumeration Base64FormattingOptions Specifies whether relevant Convert.ToBase64CharArray and Convert.ToBase64String methods insert line breaks in their output.
Public enumeration ConsoleColor Specifies constants that define foreground and background colors for the console.
Public enumeration ConsoleKey Specifies the standard keys on a console.
Public enumeration ConsoleModifiers Represents the SHIFT, ALT, and CTRL modifier keys on a keyboard.
Public enumeration ConsoleSpecialKey Specifies combinations of modifier and console keys that can interrupt the current process.
Public enumeration Supported by Portable Class Library DateTimeKind Specifies whether a DateTime object represents a local time, a Coordinated Universal Time (UTC), or is not specified as either local time or UTC.
Public enumeration Supported by Portable Class Library DayOfWeek Specifies the day of the week.
Public enumeration Environment.SpecialFolder Specifies enumerated constants used to retrieve directory paths to system special folders.
Public enumeration Environment.SpecialFolderOption Specifies options to use for getting the path to a special folder.
Public enumeration EnvironmentVariableTarget Specifies the location where an environment variable is stored or retrieved in a set or get operation.
Public enumeration Supported by Portable Class Library GCCollectionMode Specifies the behavior for a forced garbage collection.
Public enumeration GCNotificationStatus Provides information about the current registration for notification of the next full garbage collection.
Public enumeration GenericUriParserOptions Specifies options for a UriParser.
Public enumeration LoaderOptimization An enumeration used with the LoaderOptimizationAttribute class to specify loader optimizations for an executable.
Public enumeration Supported by Portable Class Library MidpointRounding Specifies how mathematical rounding methods should process a number that is midway between two numbers.
Public enumeration PlatformID Identifies the operating system, or platform, supported by an assembly.
Public enumeration Supported by Portable Class Library StringComparison Specifies the culture, case, and sort rules to be used by certain overloads of the String.Compare and String.Equals methods.
Public enumeration Supported by Portable Class Library StringSplitOptions Specifies whether applicable String.Split method overloads include or omit empty substrings from the return value.
Public enumeration Supported by Portable Class Library TypeCode Specifies the type of an object.
Public enumeration Supported by Portable Class Library UriComponents Specifies the parts of a Uri.
Public enumeration Supported by Portable Class Library UriFormat Controls how URI information is escaped.
Public enumeration Supported by Portable Class Library UriHostNameType Defines host name types for the Uri.CheckHostName method.
Public enumeration UriIdnScope Provides the possible values for the configuration setting of the System.Configuration.IdnElement in the System.Configuration namespace.
Public enumeration Supported by Portable Class Library UriKind Defines the kinds of Uris for the Uri.IsWellFormedUriString(String, UriKind) and several Uri.Uri methods.
Public enumeration UriPartial Defines the parts of a URI for the Uri.GetLeftPart method.
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