Namespace System
Classes
- Activator
Contains methods to create types of objects locally. This class cannot be inherited.
- AggregateException
Initializes a new instance of the AggregateException class with a system-supplied message that describes the error.
- AppDomainUnloadedException
The exception that is thrown when an attempt is made to access an unloaded application domain.
- ApplicationException
Serves as the base class for application-defined exceptions.
- ArgumentException
The exception that is thrown when one of the arguments provided to a method is not valid.
- 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.
- 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.
- Array
Provides methods for creating, manipulating, searching, and sorting arrays, thereby serving as the base class for all arrays in the common language runtime.
- Attribute
Represents the base class for custom attributes.
- AttributeUsageAttribute
Specifies the usage of another attribute class. This class cannot be inherited.
- BitConverter
Converts base data types to an array of bytes, and an array of bytes to base data types.
- CLSCompliantAttribute
Indicates whether a program element is compliant with the Common Language Specification (CLS). This class cannot be inherited.
- Console
Writes the specified data, followed by the current line terminator, to the standard output stream.
- 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.
- Enum
Provides the base class for enumerations.
- Environment
Provides information about, and means to manipulate, the current environment and platform. This class cannot be inherited.
- 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.
- Exception
Represents errors that occur during application execution.
- FlagsAttribute
Indicates that an enumeration can be treated as a bit field; that is, a set of flags.
- FormatException
The exception that is thrown for invalid casting or explicit conversion.
- GC
Controls the system garbage collector, a service that automatically reclaims unused memory.
- IndexOutOfRangeException
The exception that is thrown when an attempt is made to access an element of an array with an index that is outside the bounds of the array. This class cannot be inherited.
- InvalidCastException
The exception that is thrown for invalid casting or explicit conversion.
- InvalidOperationException
The exception that is thrown when a method call is invalid for the object's current state.
- MTAThreadAttribute
Indicates that the COM threading model for an application is multithreaded apartment (MTA).
- MarshalByRefObject
Enables access to objects across application domain boundaries in applications that support remoting.
- Math
Provides constants and static methods for trigonometric, logarithmic, and other common mathematical functions.
- MulticastDelegate
Represents a multicast delegate; that is, a delegate that can have more than one element in its invocation list.
- NonSerializedAttribute
Indicates that a field of a serializable class should not be serialized. This class cannot be inherited.
- NotImplementedException
The exception that is thrown when a requested method or operation is not implemented.
- 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.
- NullReferenceException
The exception that is thrown when there is an attempt to dereference a null object reference.
- 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.
- ObjectDisposedException
The exception that is thrown when an operation is performed on a disposed object.
- ObsoleteAttribute
Marks the program elements that are no longer in use. This class cannot be inherited.
- OutOfMemoryException
The exception that is thrown when there is not enough memory to continue the execution of a program.
- ParamArrayAttribute
Indicates that a method will allow a variable number of arguments in its invocation. This class cannot be inherited.
- PlatformNotSupportedException
The exception that is thrown when a feature does not run on a particular platform.
- Random
Represents a random number generator, a device that produces a sequence of numbers that meet certain statistical requirements for randomness.
- STAThreadAttribute
Indicates that the COM threading model for an application is single-threaded apartment (STA).
- SerializableAttribute
Indicates that a class can be serialized. This class cannot be inherited.
- string
Represents text as a sequence of UTF-16 code units.
- SystemException
Serves as the base class for system exceptions namespace.
- TimeoutException
The exception that is thrown when the time allotted for a process or operation has expired.
- 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.
- Uri
Provides an object representation of a uniform resource identifier (URI) and easy access to the parts of the URI.
- ValueType
Provides the base class for value types.
- Version
Represents the version number of an assembly, operating system, or the common language runtime. This class cannot be inherited.
- WeakReference
Represents a weak reference, which references an object while still allowing that object to be reclaimed by garbage collection.
Structs
- bool
Represents a Boolean value.
- byte
Represents an 8-bit unsigned integer.
- char
Represents a character as a UTF-16 code unit.
- DateTime
Represents an instant in time, typically expressed as a date and time of day.
- double
Represents a double-precision floating-point number.
- Guid
Represents a globally unique identifier (GUID).
- short
Represents a 16-bit signed integer.
- int
Represents a 32-bit signed integer.
- long
Represents a 64-bit signed integer.
- IntPtr
A platform-specific type that is used to represent a pointer or a handle.
- RuntimeArgumentHandle
This value type is used for constructing System.ArgIterator.
- RuntimeFieldHandle
Represents a field using an internal metadata token.
- RuntimeMethodHandle
RuntimeMethodHandle is a handle to the internal metadata representation of a method.
- RuntimeTypeHandle
Represents a type using an internal metadata token.
- sbyte
Represents an 8-bit signed integer.
- float
Represents a single-precision floating-point number.
- SpanByte
Provides a type- and memory-safe representation of a contiguous region of arbitrary byte array
- TimeSpan
Represents a time interval.
- ushort
Represents a 16-bit unsigned integer.
- uint
Represents a 32-bit ununsigned integer.
- ulong
Represents a 64-bit ununsigned integer.
- void
Specifies a return value type for a method that does not return a value.
Interfaces
- IAsyncResult
Represents the status of an asynchronous operation.
- ICloneable
Defines an interface indicating that an object may be cloned.
- IComparable
Defines a generalized type-specific comparison method that a value type or class implements to order or sort its instances.
- ICustomFormatter
Defines a method that supports custom formatting of the value of an object.
- IDisposable
Defines a method to release allocated resources.
- IFormatProvider
Provides a mechanism for retrieving an object to control formatting.
- IFormattable
Provides functionality to format the value of an object into a string representation.
- IServiceProvider
Defines a mechanism for retrieving a service object; that is, an object that provides custom support to other objects.
Enums
- AttributeTargets
Specifies the application elements on which it is valid to apply an attribute.
- Base64FormattingOptions
Specifies whether relevant Convert.ToBase64CharArray and Convert.ToBase64String methods insert line breaks in their output.
- 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.
- DayOfWeek
Specifies the day of the week.
- TypeCode
Specifies the type of an object.
- Uri.Flags
Defines flags kept in m_Flags variable.
- UriHostNameType
Defines host name types for the http and https protocols. method.
- UriKind
Defines the kinds of Uris for the IsWellFormedUriString(string, UriKind) method and several Uri methods.
Delegates
- Action
Encapsulates a method that has no parameters and does not return a value.
- Action<T>
Encapsulates a method that has a single parameter and does not return a value.
- Action<T1, T2>
Encapsulates a method that has a single parameter and does not return a value.
- AsyncCallback
References a method to be called when a corresponding asynchronous operation completes.
- EventHandler
Represents the method that will handle an event that has no event data.
- EventHandler<TEventArgs>
Represents the method that will handle an event when the event provides data.
- Func<TResult>
Encapsulates a method that has no parameters and returns a value of the type specified by the
TResultparameter.
- Func<T, TResult>
Encapsulates a method that has one parameter and returns a value of the type specified by the
TResultparameter.
- Func<T1, T2, TResult>
Encapsulates a method that has one parameter and returns a value of the type specified by the
TResultparameter.