Great information on MissingAssembly Error in Health Analyzer--the most common issues in the Health Analyzer when you deploy custom solutions in your SharePoint 2010 environment,

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Hi Julian,

Thank you for this great article, it saved me hours.
ReportOnly switch worked fine to get the list of EventReceivers.
But when trying to delete them, after the first delete I had a "Collection was modified; enumeration operation may not execute." Exception. And it is quite normal because the collection is modified.
I had to addapt your script by using "for" instead of "foreach", and it worked fine !
Here is the modification, the "foreach" are commented out.

Add-PSSnapin microsoft.sharepoint.powershell

function Delete-MissingAssembly($ContentDb, $Assembly, [switch]$ReportOnly)
{
[bool]$report = $false
if($ReportOnly){$report=$true}
$database = Get-SPContentDatabase | ?{$_.Name -eq $ContentDb}
#foreach($site in $database.Sites)
for($s = 0; $s -lt $database.Sites.Count; $s++)
{
$site = $database.Sites[$s]
Remove-EventReceiver -ERContainer $site -Assembly $Assembly -ReportOnly $report
#foreach($web in $site.AllWebs)
for($w = 0; $w -lt $site.AllWebs.Count; $w++)
{
$web = $site.AllWebs[$w]
Remove-EventReceiver -ERContainer $web -Assembly $Assembly -ReportOnly $report
#foreach($list in $web.Lists)
for($l = 0; $l -lt $web.Lists.Count; $l++)
{
Remove-EventReceiver -ERContainer $web.Lists[$l] -Assembly $Assembly -ReportOnly $report
}
}
}
}

function Remove-EventReceiver($ERContainer, $Assembly, $ReportOnly)
{
#foreach($er in $ERContainer.EventReceivers)
for($i = 0; $i -lt $ERContainer.EventReceivers.Count; $i++)
{
$er = $ERContainer.EventReceivers[$i]
if($er.Assembly -eq $Assembly)
{
Write-Host "Event Receiver with Id[" $er.Id "], Name[" $er.Name "] and Type [" $er.Type "] found in [" $ERContainer.Url $ERContainer.DefaultViewUrl "]."
if($ReportOnly -eq $false)
{
Write-Host "Try to delete the receiver:"
$er.Delete()
Write-Host "ER deleted."
}
}
}
}

Thanks a lot !

Couldn't get deletion to work with either ForEach or For. So I used the pipeline to grab the ID for each matching assembly and then deleted them by ID.

$evenReceiverIds = $ERContainer.EventReceivers | ? { $_.Assembly -like $Assembly } | % { $_.ID }

$evenReceiverIds | % {
$er = $ERContainer.EventReceivers[$_]
Write-Host Deleting $er.Assembly, $er.Class, $er.Type
if($ReportOnly -eq $false)
{
$er.Delete()
Write-Host " --[DELETED]"
}
}