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Unregister-Event

Updated: April 21, 2010

Applies To: Windows PowerShell 2.0

Cancels an event subscription.

Syntax

Unregister-Event [-SubscriptionId] <int> [-Force] [-Confirm] [-WhatIf] [<CommonParameters>]

Unregister-Event [-SourceIdentifier] <string> [-Force] [-Confirm] [-WhatIf] [<CommonParameters>]

Description

The Unregister-Event cmdlet cancels an event subscription that was created by using the Register-EngineEvent, Register-ObjectEvent, or Register-WmiEvent cmdlet.

When an event subscription is canceled, the event subscriber is deleted from the session and the subscribed events are no longer added to the event queue. When you cancel a subscription to an event created by using the New-Event cmdlet, the new event is also deleted from the session.

Unregister-Event does not delete events from the event queue. To delete events, use the Remove-Event cmdlet.

Parameters

-Force

Cancels all event subscriptions, including subscriptions that were hidden by using the SupportEvent parameter of Register-ObjectEvent, Register-WmiEvent, and Register-EngineEvent.

 

Required?

false

Position?

named

Default Value

none

Accept Pipeline Input?

false

Accept Wildcard Characters?

false

-SourceIdentifier <string>

Cancels event subscriptions that have the specified source identifier.

A SourceIdentifier or SubscriptionId parameter must be included in every command.

 

Required?

true

Position?

1

Default Value

none

Accept Pipeline Input?

true (ByPropertyName)

Accept Wildcard Characters?

false

-SubscriptionId <int>

Cancels event subscriptions that have the specified subscription identifier.

A SourceIdentifier or SubscriptionId parameter must be included in every command.

 

Required?

true

Position?

1

Default Value

none

Accept Pipeline Input?

true (ByPropertyName)

Accept Wildcard Characters?

false

-Confirm

Prompts you for confirmation before executing the command.

 

Required?

false

Position?

named

Default Value

none

Accept Pipeline Input?

false

Accept Wildcard Characters?

false

-WhatIf

Describes what would happen if you executed the command without actually executing the command.

 

Required?

false

Position?

named

Default Value

none

Accept Pipeline Input?

false

Accept Wildcard Characters?

false

<CommonParameters>

This command supports the common parameters: Verbose, Debug, ErrorAction, ErrorVariable, OutBuffer, OutVariable, WarningAction, and WarningVariable. For more information, see about_CommonParameters.

Inputs and Outputs

The input type is the type of the objects that you can pipe to the cmdlet. The return type is the type of the objects that the cmdlet returns.

 

Inputs

System.Management.Automation.PSEventSubscriber

You can pipe the output from Get-EventSubscriber to Unregister-Event.

Outputs

None

This cmdlet does not return any output.

Notes

Events, event subscriptions, and the event queue exist only in the current session. If you close the current session, the event queue is discarded and the event subscription is canceled.

Unregister-Event cannot delete events created by using the New-Event cmdlet unless you have subscribed to the event by using the Register-EngineEvent cmdlet. To delete a custom event from the session, you must remove it programmatically or close the session.

Example 1

C:\PS>unregister-event -sourceIdentifier ProcessStarted

Description

-----------

This command cancels the event subscription that has a source identifier of "ProcessStarted".

To find the source identifier of an event, use the Get-Event cmdlet. To find the source identifier of an event subscription, use the Get-EventSubscriber cmdlet.

Example 2

C:\PS>unregister-event -subscriptionId 2

Description

-----------

This command cancels the event subscription that has a subscription identifier of 2.

To find the subscription identifier of an event subscription, use the Get-EventSubscriber cmdlet.

Example 3

C:\PS>get-eventsubscriber -force | unregister-event -force

Description

-----------

This command cancels all event subscriptions in the session.

The command uses the Get-EventSubscriber cmdlet to get all event subscriber objects in the session, including the subscribers that are hidden by using the SupportEvent parameter of the event registration cmdlets.

It uses a pipeline operator (|) to send the subscriber objects to Unregister-Event, which deletes them from the session. To complete the task, the Force parameter is also required on Unregister-Event.

See Also

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