This is the root namespace for Windows PowerShell. It contains classes, enumerations, and interfaces. For example, cmdlet developers will use the Cmdlet and PSCmdlet base classes to implement custom cmdlet classes, and host application developers will use the PowerShell class to create runspaces and invoke commands.

 Classes

Class	Description
ActionPreferenceStopException	Exception thrown when the pipeline is stopped because of a Stop or Inquire policy.
AliasAttribute	Defines one or more user-friendly names for a cmdlet parameter.
AliasInfo	Provides information about an alias that is used to invoke a command, such as a description of the alias, the name of the command that the alias refers to, and the .NET Framework types returned by that command.
AllowEmptyCollectionAttribute	Allows an empty collection as the argument to a mandatory collection parameter.
AllowEmptyStringAttribute	Allows an empty string to be used as an argument for a mandatory string parameter.
AllowNullAttribute	Allows null as the argument of a mandatory cmdlet or function parameter.
ApplicationFailedException	The exception is thrown when an application fails.
ApplicationInfo	Provides information about applications that are not directly executable by Windows PowerShell.
ArgumentTransformationAttribute	Serves as a base class for attributes that perform argument transformations.
ArgumentTransformationMetadataException	Exception that is thrown when the ArgumentTransformation attribute encounters an error.
AuthorizationManager	Represents an authorization manager for a runspace.
Breakpoint	Describes a breakpoint that is being used by the Windows PowerShell debugger. This class is introduced in Windows PowerShell 2.0.
BreakpointUpdatedEventArgs	Define the arguments for a BreakpointUpdated event. This class is introduced in Windows PowerShell 2.0.
CallStackFrame	Defines a single item of the call stack. Each item in the call stack is referred to as a frame. This class is introduced in Windows PowerShell 2.0.
ChildItemCmdletProviderIntrinsics	Exposes the child items of provider data stores to the cmdlet base class.
Cmdlet	Serves as a base class for derived cmdlets that do not depend on the Windows PowerShell runtime and that can be called directly from within another cmdlet.
CmdletAttribute	Identifies a .NET Framework class as a cmdlet, and defines the verb and noun name pair used to invoke the cmdlet.
CmdletBindingAttribute	Identifies a function as an advanced function that acts in a way that is similar to a cmdlet. This attribute is used by script developers when writing functions in place of writing compiled cmdlets. This class is introduced in Windows PowerShell 2.0.
CmdletCommonMetadataAttribute	Serves as a base class for attributes that specify cmdlet functionality, such as the CmdletBinding attribute that is used by script developers when writing functions in place of writing compiled cmdlets. This class is introduced in Windows PowerShell 2.0.
CmdletInfo	Provides information about a cmdlet, such as its definition (usage pattern), noun and verb name, and other information.
CmdletInvocationException	Exception thrown when a cmdlet encounters a terminating error.
CmdletProviderInvocationException	Exception thrown when a provider encounters a terminating error that originated with a provider.
CmdletProviderManagementIntrinsics	Provides access to information about the providers of a runspace.
CommandBreakpoint	Defines a breakpoint on a command.
CommandInfo	Serves as a base class for information classes that describe cmdlets, functions, scripts, and other types of commands.
CommandInvocationIntrinsics	Provides access to application programming interfaces (APIs) that cmdlets can use to build script blocks and run scripts.
CommandMetadata	Provides access to the metadata that describes a command, such as the name, type, and parameters of the command. This class is introduced in Windows PowerShell 2.0.
CommandNotFoundException	Exception thrown when a command cannot be found.
CommandParameterInfo	Provides information about a parameter for a particular parameter set.
CommandParameterSetInfo	Provides information about a parameter set of a cmdlet.
ContentCmdletProviderIntrinsics	Exposes the content of data store items to the cmdlet base class.
ConvertThroughString	Enables the LanguagePrimitives.ConvertTo method to convert a type to another type using a string conversion.
CredentialAttribute	Defines the attribute used to designate that a cmdlet parameter should accept credentials.
CustomPSSnapIn	Serves as a base class for snap-ins that are used to register a list of cmdlets and providers. (Be aware that Windows PowerShell 2.0 introduced support for modules, which is the preferred method to add cmdlets and providers.)
DataAddedEventArgs	Event arguments passed to DataAdded handlers of a PSDataCollection buffer. This class is introduced in Windows PowerShell 2.0.
Debugger	Provides access to the Windows PowerShell debugger. This class is introduced in Windows PowerShell 2.0.
DebuggerStopEventArgs	Defines the arguments for the DebuggerStop event. This class is introduced in Windows PowerShell 2.0.
DebugRecord	Describes a debug message that was sent to the debug stream and information about the command that sent the message. This class is introduced in Windows PowerShell 2.0.
DisplayEntry	Represents an entry in a format display unit. This class is introduced in Windows PowerShell 2.0.
DriveManagementIntrinsics	Provides access to information for monitoring and managing the Windows PowerShell drives that are used by providers.
DriveNotFoundException	Exception thrown when a drive that is referenced by an operation could not be found.
EngineIntrinsics	Provides access to the command, provider, host, event manager, and session-state information for this instance of the Windows PowerShell runtime.
ErrorCategoryInfo	Provides access to the auxiliary information about an error.
ErrorDetails	Provides additional error information for an error record, such as a more detailed replacement error message.
ErrorRecord	Describes a terminating or nonterminating error that occurred during the processing of a command.
ExtendedTypeDefinition	Represents any additional .NET Framework type definitions for an object. This class is introduced in Windows PowerShell 2.0.
ExtendedTypeSystemException	Exception thrown when an extended type system (ETS) runtime error occurs.
ExternalScriptInfo	Provides information about Windows PowerShell scripts that are directly executable by Windows PowerShell but are not built into the runspace configuration.
FilterInfo	Provides information about a filter that is stored in the session state.
FormatViewDefinition	Represents the formatting view for a .NET Framework type. This class is introduced in Windows PowerShell 2.0.
ForwardedEventArgs	Provides access to a deserialized PSEventArgs object that describes an event that was raised from within a remote runspace and forwarded to the current runspace. This class is introduced in Windows PowerShell 2.0.
FunctionInfo	Gets information about a function that is available in the session state.
GettingValueExceptionEventArgs	Represents the arguments for events that are triggered when the GetValue method of a PSObjectPropertyDescriptor object throws an exception.
GetValueException	Exception thrown by the Windows PowerShell runtime when it recognizes that an error has occurred while getting the value of an extended member (property, method, or parameterized property) of an object.
GetValueInvocationException	The exception thrown by the underlying getter of a referenced member when it recognizes that an error has occurred while getting the value of an extended member (property, method, or parameterized property) of an object.
HaltCommandException	The exception thrown when the cmdlet or provider wants to terminate the running command without the error condition being considered an error.
IncompleteParseException	The exception thrown when an incomplete parsing error occurs while parsing Windows PowerShell script text.
InformationalRecord	Serves as a base class for debug, verbose, and warning record classes. This class is introduced in Windows PowerShell 2.0.
InvalidJobStateException	Exception that is thrown when an operation is requested the state of the Job object is different from the expected state. This class is introduced in Windows PowerShell 2.0.
InvalidPowerShellStateException	Exception that is thrown when the state of the PowerShell object is different from the expected state. For example, this exception is thrown if you invoke the pipeline and then try to add a command to the pipeline. This class is introduced in Windows PowerShell 2.0.
InvocationInfo	Provides information about invoked commands, such as the name of the command, the string used to invoke the command, and where the command is in the pipeline.
ItemCmdletProviderIntrinsics	Exposes the provider items to the cmdlet base class.
ItemNotFoundException	Exception thrown when an item cannot be found for a specified path that contains no wildcard characters.
Job	Serves as a base class for objects that represents a background job. A background job runs a command that can contain a command or expression. The job is run asynchronously within its own runspace. This class is introduced in Windows PowerShell 2.0.
JobRepository	Manages and provides information about the current active jobs. This class is introduced in Windows PowerShell 2.0.
JobStateEventArgs	Provides the arguments for a raised event that is passed to a JobStateEvent handler. This class is introduced in Windows PowerShell 2.0.
JobStateInfo	Provides information about the state of a job and, if the last state change was due to an error, the reason for the job being in its current state. This class is introduced in Windows PowerShell 2.0.
LanguagePrimitives	Provides script language semantics that can be used when consuming objects.
LineBreakpoint	Defines a breakpoint on a specific line within a script file. This class is introduced in Windows PowerShell 2.0.
ListControl	Represents a control that displays content in a list format. This class is introduced in Windows PowerShell 2.0.
ListControlEntry	Represents a single element in a list control. This class is introduced in Windows PowerShell 2.0.
ListControlEntryItem	Represents an item of an entry for a list control entry. This class is introduced in Windows PowerShell 2.0.
MetadataException	The exception thrown when errors occur while processing metadata. In this case, the term "metadata" refers to the attributes declared in cmdlets and providers.
MethodException	The exception thrown when Windows PowerShell detects that an error has occurred while invoking a method.
MethodInvocationException	The exception thrown when the referenced method detects that an error has occurred while invoking the method.
OutputTypeAttribute	Identifies the .NET Framework types that are returned by a cmdlet or by a script. This class is introduced in Windows PowerShell 2.0.
ParameterAttribute	Defines the Parameter attribute that is used to identify a cmdlet or function parameter. For more information about the syntax and parameters used to declare the Parameter attribute for cmdlets, see ParameterAttribute Declaration.
ParameterBindingException	The exception thrown if the specified value cannot be bound to a parameter of a command.
ParameterMetadata	Describes the metadata for cmdlet, script, and function parameters. This class is introduced in Windows PowerShell 2.0.
ParameterSetMetadata	Represents the metadata for a parameter that belongs to a parameter set. A parameter can have different metadata for each parameter set that it belongs to. This class is introduced in Windows PowerShell 2.0.
ParentContainsErrorRecordException	The exception contained in an ErrorRecord object when that object is contained in a parent exception implementing the IContainsErrorRecord interface. This prevents the ErrorRecord property of the parent exception and the ErrorRecord object from containing mutual references to one another.
ParseException	The exception thrown when an error occurs while parsing a script.
ParsingMetadataException	The exception that is thrown for all parameter-binding exceptions that are related to metadata attributes.
PathInfo	Provides information about a Windows PowerShell path.
PathInfoStack	Represents a stack of locations.
PathIntrinsics	Provides information about a path for providers.
PipelineClosedException	Exception thrown when an attempt is made to write to an asynchronous pipeline source that is already closed.
PipelineDepthException	The exception thrown when the number of commands participating in a pipeline (object streaming) exceeds the configured maximum. This class is introduced in Windows PowerShell 2.0.
PipelineStoppedException	The exception thrown when a cmdlet or a Windows PowerShell provider attempts to write to the pipeline or perform a number of other Windows PowerShell operations after the pipeline has been terminated. The pipeline could have been terminated before the call was made or during the call.
PowerShell	Provides methods that are used to create a pipeline of commands and invoke those commands either synchronously or asynchronously within a runspace. This class also provides access to the output streams that contain data that is generated when the commands are invoked. This class is primarily intended for host applications that programmatically use Windows PowerShell to perform tasks. This class is introduced in Windows PowerShell 2.0.
ProgressRecord	Represent the status of an ongoing operation at a point in time.
PropertyCmdletProviderIntrinsics	Exposes the Windows PowerShell provider properties to the cmdlet base class.
ProviderCmdlet	Defines the cmdlet names that a provider can use when declaring the OutputType attribute. The OutputType attribute declares what .NET Framework types are returned by a cmdlet. This class is introduced in Windows PowerShell 2.0.
ProviderInfo	Provides information about a loaded Windows PowerShell provider.
ProviderIntrinsics	Exposes the providers to the Cmdlet base class. The methods of this class use the providers to perform operations.
ProviderInvocationException	The exception thrown when a provider encounters an error.
ProviderNameAmbiguousException	The exception thrown when more than one provider exists for a given provider name and the request does not contain the snap-in name qualifier.
ProviderNotFoundException	The exception thrown when the provider, referenced by an operation, cannot be found.
ProxyCommand	Represents a command that is based on another command, and is created dynamically by the Windows PowerShell runtime. This class is introduced in Windows PowerShell 2.0.
PSAdaptedProperty	Represents an extended adapted property of a PSObject object. This class is introduced in Windows PowerShell 2.0.
PSAliasProperty	Represents an alias to another extended property of a PSObject object.
PSArgumentException	The exception thrown when a parameter contains an argument that is not valid.
PSArgumentNullException	The exception thrown when a non-null value is expected and a parameter contains a null value.
PSArgumentOutOfRangeException	The exception thrown when a parameter contains an argument that is outside the range expected by the Windows PowerShell runtime.
PSCmdlet	Serves as a base class for derived cmdlets that depend on access to the Windows PowerShell runtime, and therefore execute within a runspace.
PSCodeMethod	Serves as an additional code method for a PSObject object.
PSCodeProperty	Represents an extended code property of a PSObject object.
PSCommand	Defines a pipeline that can be run by a PowerShell object. This class is introduced in Windows PowerShell 2.0.
PSControl	Serves as a base class for control elements that are used to define how content is displayed, such as list and table controls. This class is introduced in Windows PowerShell 2.0.
PSCredential	Represents a set of security credentials such as a user name and a password.
PSCustomObject	Serves as a placeholder object that is used when the PSObject constructor, which has no parameters, is used.
PSDataCollection	A thread safe buffer that is used by Windows PowerShell host applications to provide input data when invoking a pipeline of commands asynchronously. This class is introduced in Windows PowerShell 2.0.
PSDataStreams	Provides access to the data streams of a PowerShell object. These data streams include the debug, error, progress, verbose, and warning data streams, but do not include the output data stream. This class is introduced in Windows PowerShell 2.0.
PSDebugContext	Provides information about why Windows PowerShell entered the debugger. This class is introduced in Windows PowerShell 2.0.
PSDriveInfo	Provides information about a Windows PowerShell drive that is used to access stored data through a provider.
PSEngineEvent	Defines the constants that represent Windows PowerShell engine events. This class is introduced in Windows PowerShell 2.0.
PSEvent	Represents a .NET Framework event on an object that can be surfaced by using the Get-Member cmdlet. This class is introduced in Windows PowerShell 2.0.
PSEventArgs	Provides access to the eventing functionality provided by Windows PowerShell. This class can be used to subscript to and receive events. This class is introduced in Windows PowerShell 2.0.
PSEventArgsCollection	Represents the events received by the Event Manager. This class is introduced in Windows PowerShell 2.0.
PSEventHandler	Serves as a base class for deriving an event handler for PSEvent objects. These objects represent events that are generated by Windows PowerShell. This class is introduced in Windows PowerShell 2.0.
PSEventJob	Represents an action that can be taken as a background job when an event arrives. This class is introduced in Windows PowerShell 2.0.
PSEventManager	Represents the Windows PowerShell event manager that handles subscribing to and receiving events that are raised by Windows PowerShell. This class is introduced in Windows PowerShell 2.0.
PSEventSubscriber	Represents a subscriber to those events that are generated by Windows PowerShell. This object is returned by the Get-EventSubscriber cmdlet. This class is introduced in Windows PowerShell 2.0.
PSInstaller	Serves as a base class for the EngineInstaller and PSSnapInInstaller classes.
PSInvalidCastException	The exception thrown when an error occurs during type conversions.
PSInvalidOperationException	The exception thrown when an operation that is not valid is requested.
PSInvocationSettings	Specifies the settings that can be used by the PowerShell object when the pipeline is invoked. This class is introduced in Windows PowerShell 2.0.
PSInvocationStateChangedEventArgs	Provides the event arguments passed to PowerShell object state change handlers. This class is introduced in Windows PowerShell 2.0.
PSInvocationStateInfo	Provides information about the current state of the invocation process, such as what the current state is and, if a failure occurred, the reason for the last state change. This class is introduced in Windows PowerShell 2.0.
PSListModifier	Provides Add, Remove, and Replace lists that can be used to update lists. This class is introduced in Windows PowerShell 2.0.
PSListModifier	Provides Add, Remove, and Replace lists that can be used to update lists. This class is introduced in Windows PowerShell 2.0.
PSMemberInfo	Serves as a base class for extended member classes that provide information, such as the PSEvent, PSMethodInfo, and PSPropertyInfo classes. Extended members are those members that are added to a PSObject object.
PSMemberInfoCollection	Serves as a collection of members in a PSObject or PSMemberSet object.
PSMemberSet	Serves as a set of members.
PSMethod	Defines a method that provides access to a method of the base object or made accessible through an adapter. These methods are referred to as Windows PowerShell methods.
PSMethodInfo	Serves as a base class for all extended member classes that act like methods, such as the PSScriptMethod and PSCodeMethod classes.
PSModuleInfo	Provides information about a module, such as the name of the module file, the path to the module file, what elements are exported from the module, and more. This class is introduced in Windows PowerShell 2.0.
PSNoteProperty	Represents an extended note property of a PSObject object.
PSNotImplementedException	Exception thrown when a requested operation is not implemented.
PSNotSupportedException	Exception thrown when a requested operation is not supported.
PSObject	Encapsulates a base object of type Object or type PSCustomObject to allow for a consistent view of any object within the Windows PowerShell environment.
PSObjectDisposedException	The exception thrown when a target object has already been disposed of.
PSObjectPropertyDescriptor	Provides information about a property of an adapted object or a PSObject object.
PSObjectTypeDescriptionProvider	Retrieves a PSObjectTypeDescriptor object that provides information about the properties of an object of type PSObject.
PSObjectTypeDescriptor	Provides information about the properties of a PSObject object.
PSParameterizedProperty	Provides access to parameterized properties of a base object.
PSParseError	Provides information about a syntax error that was detected while parsing a script into tokens. This class is introduced in Windows PowerShell 2.0.
PSParser	Provides a mechanism to parse a script into a collection of tokens. This class is introduced in Windows PowerShell 2.0.
PSPrimitiveDictionary	Provides a hash table that contains keys that are case-insensitive strings and values that can be serialized and deserialized during Windows PowerShell remoting handshakes. This class is introduced in Windows PowerShell 2.0.
PSProperty	Serves as a base property for a Windows PowerShell property or an adapter property of a PSObject object.
PSPropertyAdapter	Represents an adapter that is used to expose the properties of objects. This class is introduced in Windows PowerShell 2.0.
PSPropertyInfo	Serves as a base class for all extended members of a PSObject object that behave like properties. This can include alias, code, note, and script properties.
PSPropertySet	Represents a set of properties.
PSReference	Defines an object that is a value or variable reference in the Windows PowerShell scripting language.
PSScriptMethod	Represents a method that runs a script when it is called. These methods are used to extend objects, and are referred to as script methods.
PSScriptProperty	Represents an extended script property of a PSObject object.
PSSecurityException	A wrapper for the SecurityException class.
PSSnapIn	Serves as a base class for Windows Powershell snap-ins that are used to register all the cmdlets and providers in an assembly. (Be aware that Windows PowerShell 2.0 introduced support for modules, which is the preferred method to add cmdlets and providers.)
PSSnapInInfo	Provides information about a Windows Powershell snap-in. Snap-ins are used to add and cmdlets or Windows PowerShell provider to a session.
PSSnapInInstaller	Serves as a base class for classes used to create Windows Powershell snap-ins. This class is included in this SDK for completeness only. The members of this class cannot be used directly, nor should this class be used to derive other classes.
PSToken	Represents a token generated from a Windows PowerShell script. This class is introduced in Windows PowerShell 2.0.
PSTraceSource	Represents a TraceSource object that is used by the Windows PowerShell runtime to produce trace output.
PSTransaction	Represents an active transaction. creates a PSTransaction object when the New-Transaction cmdlet is called the first time (Windows PowerShell supports only one active transaction). This object is returned by the Get-Transaction cmdlet. This class is introduced in Windows PowerShell 2.0.
PSTransactionContext	Provides a mechanism to reset the current Windows PowerShell transaction. This class is introduced in Windows PowerShell 2.0.
PSTypeConverter	Defines a base class that is used to implement a type converter for a specific target class.
PSTypeName	Represents a .NET Framework type. The PSTypeName object can be used where the real .NET Framework type is not be available. This class is introduced in Windows PowerShell 2.0.
PSVariable	Represents a variable used in the Windows PowerShell language.
PSVariableIntrinsics	Provides access to variable information for the session.
PSVariableProperty	Represents an extended variable property of a PSObject object. This class is introduced in Windows PowerShell 2.0.
ReadOnlyPSMemberInfoCollection	Serves as a read only collection of members.
RedirectedException	Exception that is used in the ErrorRecord object for an object that is added to the error stream.
RemoteCommandInfo	Represents a command that was invoked on another runspace, typically on a remote computer. This class is introduced in Windows PowerShell 2.0.
RemoteException	Exception that is used to wrap an error coming from a remote instance of Windows PowerShell.
Repository	Contains the objects of active elements, such as PSJob and RemoteRunspaceInfo objects. This class is introduced in Windows PowerShell 2.0.
RunspaceInvoke	Allows the execution of commands from a CLR language.
RunspacePoolStateInfo	Provides information about the current state of the runspace pool, such as what the current state is and, if a failure occurred, the reason for the last state change. This class is introduced in Windows PowerShell 2.0.
RunspaceRepository	Provides information about the state of the remote runspaces that are available to the local runspace. This class is introduced in Windows PowerShell 2.0.
RuntimeDefinedParameter	Represents a dynamic parameter that is constructed at runtime. The Windows PowerShell runtime adds this parameter to the parameter list of a cmdlet or function when some pre-defined condition is met, such as a specific argument is supplied for some other parameter.
RuntimeDefinedParameterDictionary	Represents a collection of parameters that can be constructed at runtime.
RuntimeException	Serves as a base class for Windows PowerShell exceptions that might occur while a command is running.
ScriptBlock	Represents a precompiled block of script text that can be used as a single unit.
ScriptBlockToPowerShellNotSupportedException	Exception thrown when converting from a ScriptBlock object to a PowerShell object is not allowed. This class is introduced in Windows PowerShell 2.0.
ScriptCallDepthException	The exception thrown when the number of session state objects of a specific type and in a specific scope exceeds the configured maximum number allowed.
ScriptInfo	Provides information about those scripts that are directly executable by Windows PowerShell.
ScriptRequiresException	Exception thrown when a script cannot run because the requirements that are specified by the script’s #requires statements, are not met.
SecurityDescriptorCmdletProviderIntrinsics	Provides the Windows PowerShell provider security APIs to the cmdlet base class.
SessionState	Provides access to data that describes the current operating environment of a Windows PowerShell runspace or module. The properties of this class retrieve objects that can then be used to either monitor or modify the session state data.
SessionStateException	The exception thrown when an error occurs while working with session-state elements such as variables, aliases, functions, filters, drives, and providers.
SessionStateOverflowException	The exception thrown when the number of session-state objects exceeds the maximum number allowed for this type in this scope.
SessionStateUnauthorizedAccessException	The exception thrown when a change to a session-state object cannot be completed because the object is read-only, because the object is a constant, or because the object that is declared as a constant cannot be removed or made a nonconstant.
SettingValueExceptionEventArgs	Represents the arguments for events that are triggered by exceptions thrown by the SetValue method of a PSObjectPropertyDescriptor object.
SetValueException	The exception thrown by Windows PowerShell when it recognizes that an error has occurred while setting the value of an ETS member (property, method, or parameterized property).
SetValueInvocationException	Exception thrown by the underlying setter of a referenced member when it recognizes that an error has occurred while setting the value of an ETS member (property, method, or parameterized property).
Signature	Represents a digital signature on a signed file.
SteppablePipeline	Represents a steppable pipeline. This class is introduced in Windows PowerShell 2.0.
TableControl	Represents a control that displays content in a table format. This class is introduced in Windows PowerShell 2.0.
TableControlColumn	Represents a column of data in a row of a Table control. This class is introduced in Windows PowerShell 2.0.
TableControlColumnHeader	Represents a column header in a Table control. This class is introduced in Windows PowerShell 2.0.
TableControlRow	Represents the content of a row in a Table control. This class is introduced in Windows PowerShell 2.0.
ValidateArgumentsAttribute	Serves as the base class for all validation attributes that validate cmdlet parameter arguments.
ValidateCountAttribute	Defines an attribute that uses maximum and minimum limits to validate the number of arguments that a cmdlet parameter accepts. (This attribute can also be used by Windows PowerShell functions.)
ValidateEnumeratedArgumentsAttribute	Serves as a base class for validation attributes that validate each element of an argument of a parameter.
ValidateLengthAttribute	Defines an attribute that uses minimum and maximum limits to validate the number of characters in a cmdlet parameter argument (This attribute can also be used by Windows PowerShell functions.)
ValidateNotNullAttribute	Validates that the argument of an optional parameter is not null.
ValidateNotNullOrEmptyAttribute	Validates that the argument of an optional parameter is not null, an empty string, or an empty collection.
ValidatePatternAttribute	Defines an attribute that uses a regular expression to validate the character pattern of a cmdlet parameter argument. (This attribute can also be used by Windows PowerShell functions.)
ValidateRangeAttribute	Defines an attribute that uses minimum and maximum values to validate a cmdlet parameter argument (This attribute can also be used by Windows PowerShell functions.)
ValidateScriptAttribute	Defines an attribute that uses a script to validate a parameter of any Windows PowerShell function that declares the CmdletBinding attribute. (This attribute cannot be used to validate the argument of a cmdlet parameter.) This class is introduced in Windows PowerShell 2.0.
ValidateSetAttribute	Defines an attribute that uses a set of values to validate a cmdlet parameter argument.
ValidationMetadataException	The exception thrown when an error occurs while validating input for any validation attribute.
VariableBreakpoint	Defines a breakpoint on a variable. This class is introduced in Windows PowerShell 2.0.
VerboseRecord	Describes a verbose message sent to the verbose stream, plus information about the command that sent the message. This class is introduced in Windows PowerShell 2.0.
VerbsCommon	Defines the common verb names that can be used to name cmdlets, such as the verbs “get” and “set”.
VerbsCommunications	Defines the communication verb names that can be used to name cmdlets.
VerbsData	Defines the data verbs, such as Import, Export, Merge, Update, and Restore, that can be used to specify the action of a cmdlet.
VerbsDiagnostic	Defines the diagnostic verb names that can be used to specify the action of a cmdlet, such as Debug, Ping, and Trace.
VerbsLifecycle	Defines the lifecycle verbs, such as Enable, Disable, Start, and Stop, that can be used to name cmdlets.
VerbsOther	Defines canonical verb names that do not fit into a specific verb name category such as the common, communications, data, lifecycle, or security verb names.
VerbsSecurity	Defines the security verbs that can be used to name cmdlets.
WarningRecord	Describes a warning message sent to the warning stream, plus information about the command that sent the message. This class is introduced in Windows PowerShell 2.0.
WideControl	Represents a control that displays content in a wide column format. This class is introduced in Windows PowerShell 2.0.
WideControlEntryItem	Represents an entry in a wide column control. This class is introduced in Windows PowerShell 2.0.
WildcardPattern	Represents a wildcard pattern that is used for matching.
WildcardPatternException	Exception thrown when a wildcard pattern is not valid.

 Interfaces

Interface	Description
ICommandRuntime	This interface provides a mechanism for overriding the default behavior of methods, such as the ShouldProcess and WriteObject methods, called by cmdlets that are invoked directly from within another cmdlet using the Invoke method.
IContainsErrorRecord	Provides a mechanism for adding an error record to an exception.
IDynamicParameters	Provides a mechanism for a cmdlet to retrieve parameters that can be added dynamically by the Windows PowerShell runtime.
IResourceSupplier	Provides a mechanism for obtaining a resource string based on a base name and resource identifier.

 Structures

Structure	Description
SwitchParameter	Defines a type of parameter that is evaluated based on its presence on the command line. Cmdlets and functions can define switch parameters that are evaluated by the Windows PowerShell runtime when the parameters of the command are bound.

 Delegates

Delegate	Description
PSEventReceivedEventHandler	Represents the delegate called by events that are raised by the Windows PowerShell Event Manager. This class is introduced in Windows PowerShell 2.0.

 Enumerations

Enumeration	Description
ActionPreference	Defines the actions that the Windows PowerShell runtime takes when an error occurs, and when debugging, progress, warning, and verbose messages are written.
Alignment	Defines how content is defined in a display cell. This class is introduced in Windows PowerShell 2.0.
BreakpointUpdateType	Defines the different ways that a breakpoint can be updated, such as when it was set or removed. This class is introduced in Windows PowerShell 2.0.
CommandOrigin	Defines the dispatch origin of a command.
CommandTypes	Defines the types of commands that Windows PowerShell can execute.
ConfirmImpact	Defines the impact level of the action performed by the cmdlet. For example, cmdlets may have a high, medium, or low risk of losing data.
CopyContainers	Defines how a copy operation acts on a container.
DebuggerResumeAction	Defines the ways that the debugger can resume its execution after a breakpoint is encountered. This class is introduced in Windows PowerShell 2.0.
DisplayEntryValueType	Defines the type of the display entry, such as a script block or property. This class is introduced in Windows PowerShell 2.0.
ErrorCategory	Defines the error categories used to group errors for display purposes.
JobState	Defines the state of the job, such as has the job started, is it running, or has it been stopped. This class is introduced in Windows PowerShell 2.0.
ModuleAccessMode	Defines how a module can be accessed when adding or removing the module, such as a read-only or read-write module. This class is introduced in Windows PowerShell 2.0.
ModuleType	Defines the type of module, which is based on the type of root module file. This class is introduced in Windows PowerShell 2.0.
ProgressRecordType	Defines if an activity of a progress report is in progress or completed.
PSCredentialTypes	Defines the types of Windows PowerShell credentials.
PSCredentialUIOptions	Defines the options that are available, such as different validation options, when prompting for credentials.
PSInvocationState	Defines the states of a PowerShell pipeline. This class is introduced in Windows PowerShell 2.0.
PSLanguageMode	Defines what elements of the Windows PowerShell language are available to external requests. This class is introduced in Windows PowerShell 2.0.
PSMemberTypes	Defines the type of members that can be added to a PSObject object.
PSMemberViewTypes	Defines the methods and properties of the PSObject that are accessible. This class is introduced in Windows PowerShell 2.0.
PSTokenType	Defines the types of tokens that can be generated from Windows PowerShell scripts. This class is introduced in Windows PowerShell 2.0.
PSTraceSourceOptions	Defines the tracing options based on the types of tracing that are enabled. For example, tracing can be enabled to trace methods, properties, errors, and more.
PSTransactionStatus	Defines the status of a Windows PowerShell transaction, such as it is currently active or have the actions of the transaction been accepted or rejected. This class is introduced in Windows PowerShell 2.0.
RemoteStreamOptions	Defines the data streams that are updated with the invocation information for remote calls. This class is introduced in Windows PowerShell 2.0.
ReturnContainers	Defines what type containers are returned.
RollbackSeverity	Defines the error condition that will cause Windows PowerShell to automatically rollback a transaction. This class is introduced in Windows PowerShell 2.0.
ScopedItemOptions	Defines how session-state data can be used.
SessionCapabilities	Defines the capabilities provided by a session, such as can it be used for implicit and interactive remoting. This class is introduced in Windows PowerShell 2.0.
SessionStateCategory	Defines the type of session state element that was being accessed when an error occurred.
SessionStateEntryVisibility	Defines the visibility of a session state entry to request from outside the session state. This class is introduced in Windows PowerShell 2.0.
ShouldProcessReason	Defines the reason why the ShouldProcess method was called.
SignatureStatus	Defines the status of a signature for a file.
SigningOption	Defines the options that control what data is embedded in the signature blob.
SplitOptions	Defines the options available for the –split operator that is used to separate one or more strings into substrings. This class is introduced in Windows PowerShell 2.0.
VariableAccessMode	Defines the access modes that can be used to trigger a variable breakpoint. This class is introduced in Windows PowerShell 2.0.
WildcardOptions	Defines the options that are available to modify how wildcard patterns are matched.