Deleting all alerts on a sharepoint list using powershell?

Question

I understand alerts will only be show to those who created them.

However I am on a test site and would like to rid the list of all alerts.

Is there a way to do this programatically.

I can seem to list them out using the following script:(See below error)

When I tried including a $web.Alerts.Delete() in the for block it throws me an error

(Cannot find an overload for "Delete" and the argument count: At C:\Users\spfarm\desktop\Alerts.ps1:14 char:19 + $web.Alerts.Delete <<<< (); + CategoryInfo : NotSpecified: (:) [], MethodEx + FullyQualifiedErrorId : MethodCountCouldNotFindBest)

$web = Get-SPWeb "http://SharepointTest:2000/"
$listurl = "http://sharepointTest:2000/Lists/Announcements/"

foreach($alert in $web.Alerts)
{
#if($alert.ListUrl -eq $ListUrl)
#{ 
 "User - " + $alert.User.Name
 "Title - " + $alert.Title
 "Frequency - " + $alert.AlertFrequency
 "Delivery Via - " + $alert.DeliveryChannels
 "Change Type - " + $alert.eventtype
 Write-Host "_____________________"

#}
}

Dave Wise · Accepted Answer · 2012-07-18 15:32:53Z

3

According to the Microsoft Documentation, there is no .Delete() method on the SPAlertsCollection that takes no parameters. It appears that the method requires you to iterate through the alerts and then delete each one by passing the alert unique ID to the .Delete(GUID) method

answered Jul 18, 2012 at 15:32

Dave Wise

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Add a comment |

Colin Thornton · Accepted Answer · 2018-05-04 02:08:05Z

The solution from Manish won't work as you'll get the error: Collection was modified; enumeration operation may not execute.

Collection was modified; enumeration operation may not execute Delete all libraries

Try this:

Add-PSSnapin Microsoft.SharePoint.PowerShell -ErrorAction SilentlyContinue

$web = Get-SPWeb "http://SharepointTest:2000/"
$webAlerts = $web.Alerts;

$alertsToDelete = @()

foreach($alert in $webAlerts)
{
    $alertsToDelete += $alert.Id
}

write-host "Found this many alerts to delete: " $alertsToDelete.Count

foreach($alertId in $alertsToDelete) {

    write-host "deleting alert: " $alertId

    $web.Alerts.Delete($alertId)
}

Manish Oswal · Accepted Answer · 2018-03-26 10:51:15Z

you can try this powershell to deleted alerts on the web

This script deletes ALL alerts for a web with the specific title

 $webUrl = read-host "Please input web url"
$alertTitle = read-host "Pleas input alert title"
$web = get-spweb $webUrl

if($web -ne $null)
{
    $alerts = $web.alerts | where-object {$_.title -eq $alertTitle}

    if($alerts -ne $null)
    {
        "Alerts found: " + $alerts.count.tostring()

        foreach($alert in $alerts)
        {
            "Deleting Alert '" + $alert.title + "' with ID '" + $alert.id.tostring() + "' for user '" + $alert.user + "'"
            $web.alerts.delete($alert.id)
        }
    }else
    {
        "##### No alerts found ######"
    }
}else
{
    "##### Web not found ######"
}

$web.dispose()

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