Adding Event Receivers with PowerShell

Here’s my little script for removing and adding Event Receivers with PowerShell.

You’ll need to update the first four lines that set the web, list, assembly and class names and then adjust the events you want to register at the end of the script. I hope you find this useful….

Add-PSSnapin Microsoft.SharePoint.PowerShell –erroraction SilentlyContinue

## setup our properties
$SiteUrl = "http://your.web.url/goes/here"
$ListName = "Elements"
$assembly = "your.assembly.name, Version=1.0.0.0, Culture=neutral, PublicKeyToken=9d09fbe311db6826"
$class = "your.assembly.name.classname"

## function to add the receiver
Function AddReceiver($type)
{  
    Write-Host "    Adding receiver: $type – $assembly – $class" -nonewline
    try {
        $OpenList.EventReceivers.Add("ItemAdded", $assembly, $class)
        Write-Host " – done" -foreground green  
    }
    catch {
        Write-Host " – error adding receiver : $_" -foreground red  
    }
}

## open the web site
Write-Host "Opening web ‘$SiteUrl’" -nonewline
$OpenWeb = Get-SPWeb $SiteUrl -EA Stop
Write-host " – done " -foreground green

## open the list
Write-Host "Opening ‘$ListName’ list" -nonewline
$OpenList = $OpenWeb.Lists[$ListName]
if ($OpenList -eq $null)
{
    Write-host " – can’t open list " -foreground red
    return
}
else
{
    Write-host " – done " -foreground green
}

## remove any existing event receivers
Write-Output "Removing existing event receivers:"
$count = $OpenList.EventReceivers.Count
if ($count -gt 0)
{
    for( $x = $count -1; $x -gt -1; $x–)
    {
        $Receiver = $OpenList.EventReceivers[$x] ; $t = $Receiver.Type ; $a = $Receiver.Assembly ; $c = $Receiver.Class
        Write-Host "    [$x] – $t – $a – $c" -nonewline
        $Receiver.Delete()
        Write-Host " – done " -foreground green
    }
}
else
{
    Write-Host "    – no existing EventReceivers found." -foreground green
}

## add new event receivers
Write-Host "Adding new event receivers:"
## add a new row for each type required to be registered
AddReceiver("ItemAdded")
AddReceiver("ItemUpdated")

Write-Host "-FIN-" -foreground green

I hope you find this useful…