Updating/setting multiple values in lookup field through powershell

Question

I'm trying to set multiple values to lookup column. I can get it to set one value but multiple values don't work
see below
[Microsoft.SharePoint.SPFieldLookupValueCollection] $itemValues = New-Object Microsoft.SharePoint.SPFieldLookupValueCollection
[Microsoft.SharePoint.SPFieldLookupValue] $lookupvalue = New-Object Microsoft.SharePoint.SPFieldLookupValue
$lookupvalue.LookupId = 1
$lookupvalue.LookupId = 2
$itemValues.Add($lookupvalue)
$CMRSItems["Event Type"] = $itemValues
$CMRSItems.Update()
I was expecting the LookupID 1 and 2 to update but it doesn't. When i specify LookupId = 1 it works
What am i doing wrong.
Thanks in Advance

Answer 1

Hi Patrick, 
In your script above you're using the same object to set both ID's on. Setting the ID of $lookupvalue, then adding it to the lookupvaluecollection, before changing the ID value to 2, then adding that to the collection. 
I wrote an article on setting fields using PowerShell, but it doesn't include multiple lookup values. It does contain multiple choice and taxonomy values though, which is a similar concept. It's here if you want to take a look: http://social.technet.microsoft.com/wiki/contents/articles/20831.sharepoint-a-complete-guide-to-getting-and-setting-fields-using-powershell.aspx
Regards, Matthew
MCPD | MCITP
My Blog
View
Matthew Yarlett's profile
See my webpart on the TechNet Gallery that allows administrative users to upload, crop and format user profile photos. Check it out here:
Upload and Crop User Profile Photos