NAME
    Unregister-Event

SYNOPSIS
    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 [<SwitchParameter>]
        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
        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
        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
        Accept pipeline input?     true (ByPropertyName)
        Accept wildcard characters? false

    -Confirm [<SwitchParameter>]
        Prompts you for confirmation before executing the command.

        Required?                    false
        Position?                    named
        Default value
        Accept pipeline input?     false
        Accept wildcard characters? false

    -WhatIf [<SwitchParameter>]
        Describes what would happen if you executed the command without actually executing the command.

        Required?                    false
        Position?                    named
        Default value
        Accept pipeline input?     false
        Accept wildcard characters? false

    <CommonParameters>
        This cmdlet supports the common parameters: Verbose, Debug,
        ErrorAction, ErrorVariable, WarningAction, WarningVariable,
        OutBuffer and OutVariable. For more information, type,
        “Get-Help about_CommonParameters“.

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.

RELATED LINKS
    Online version: http://go.microsoft.com/fwlink/?LinkID=135269
    Register-ObjectEvent
    Register-EngineEvent
    Register-WmiEvent
    Unregister-Event
    Get-Event
    New-Event
    Remove-Event
    Wait-Event
    Get-EventSubscriber