I want to add multiple users in multi-picker person field in SharePoint list. I tried below code but always getting an error that:

New-object : Cannot find type [Microsoft.SharePoint.SPFieldUserValueCollection]: verify that the assembly containing this type is loaded.

Can anyone help me to fix this issue?

$ClientContext = New-Object Microsoft.SharePoint.Client.ClientContext($SiteURL)
$Securedpw = ConvertTo-SecureString $Password -AsPlainText -Force
$ClientContext.Credentials = New-Object Microsoft.SharePoint.Client.SharePointOnlineCredentials($UserName, $Securedpw)
$web = $ClientContext.Web 
$list= $web.lists.GetByTitle($listName)
$ListItemCreationInformation = New-Object Microsoft.SharePoint.Client.ListItemCreationInformation
$ListItem= $list.AddItem($ListItemCreationInformation)

$UserAccounts="domain\arzoo; domain\ashwin"
$UserAccountsColl = $UserAccounts -split ';'
$UserCollection = new-object Microsoft.SharePoint.SPFieldUserValueCollection
foreach($UserAccount in $UserAccountsColl)
   #Get the User

    #Add to collection
    $UserFieldValue = new-object Microsoft.SharePoint.SPFieldUserValue($Web, $User.ID, $User.LoginName)

#update the Multiple value Person or Group field
$ListItem[$FieldName] = $UserCollection

Load SharePoint CSOM assemblies in beginning:

Add-Type -Path (Resolve-Path "C:\Program Files\Common Files\microsoft shared\Web Server Extensions\16\ISAPI\Microsoft.SharePoint.Client.dll")
Add-Type -Path (Resolve-Path "C:\Program Files\Common Files\microsoft shared\Web Server Extensions\16\ISAPI\Microsoft.SharePoint.Client.Runtime.dll")

And try to initialize $UserCollection as below in your code:

$UserCollection = @()
foreach($UserAccount in $UserAccountsColl)
   #Get the User
    $spuserValue = New-Object Microsoft.SharePoint.Client.FieldUserValue
    $spuserValue.LookupId = $User.id  
    $UserCollection += $spuserValue
$userValueCollection = [Microsoft.SharePoint.Client.FieldUserValue[]]$UserCollection 

#update the Multiple value Person or Group field
$ListItem[$FieldName] = $userValueCollection

Hope this will help you.

  • I tried to initialize $UserCollection and loaded relevant path also still getting the same error @dikesh gandhi – Arzoo Soni Apr 24 '19 at 9:12
  • Hello Dikesh. Your added .dlls do not deliver the SPFieldUserValueCollection. Therefore, you would need to add the Microsoft.SharePoint.dll. – SteffPoint Dec 6 '19 at 12:34
  • 1
    Thanks @SteffPoint for drawing my attention. I have updated my answer. – Dikesh Gandhi Dec 6 '19 at 13:42
  • You're welcome. I have made the experience, that when writing multiple users to a person field (multi = true) in a document library (SP2013 on prem), only the first person is written into the SP- field. Do you have any idea, what could be the issue? My script is pretty much the same as yours - see here: sharepoint.stackexchange.com/questions/272870/… – SteffPoint Dec 6 '19 at 14:52

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