Unregister-​Event

Cancels an event subscription.

Syntax

Unregister-Event
          [-SourceIdentifier] <String>
          [-Confirm]
          [-Force]
          [-WhatIf]
          [<CommonParameters>]
Unregister-Event
          [-SubscriptionId] <Int32>
          [-Confirm]
          [-Force]
          [-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.

Examples

Example 1: Cancel an event subscription by source identifier

PS C:\> Unregister-Event -SourceIdentifier "ProcessStarted"

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: Cancel an event subscription by subscription identifier

PS C:\> Unregister-Event -SubscriptionId 2

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: Cancel all event subscriptions

PS C:\> Get-EventSubscriber -Force | Unregister-Event -Force

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.

Required Parameters

-SourceIdentifier

Specifies a source identifier that this cmdlet cancels event subscriptions.

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

Type:String
Position:0
Default value:None
Accept pipeline input:True (ByPropertyName)
Accept wildcard characters:False
-SubscriptionId

Specifies a source identifier ID that this cmdlet cancels event subscriptions.

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

Type:Int32
Position:0
Default value:None
Accept pipeline input:True (ByPropertyName)
Accept wildcard characters:False

Optional Parameters

-Confirm

Prompts you for confirmation before running the cmdlet.

Type:SwitchParameter
Aliases:cf
Position:Named
Default value:False
Accept pipeline input:False
Accept wildcard characters:False
-Force

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

Type:SwitchParameter
Position:Named
Default value:None
Accept pipeline input:False
Accept wildcard characters:False
-WhatIf

Shows what would happen if the cmdlet runs. The cmdlet is not run.

Type:SwitchParameter
Aliases:wi
Position:Named
Default value:False
Accept pipeline input:False
Accept wildcard characters:False

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.

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