PowerShell script to change the content type for an existing document in Modern SharePoint Site

Technology Specialist
Published On :   02 Jan 2019
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During our O365 Migration, we had an issue with removing old content type at library level since the items are attached with the old content type, hence I wrote script to change the old content type with the new content type for each items.

In this article, let us see how to change the document content type for an existing item without changing/modifying the Modified by and Modified columns.

Note: Before changing the content type of your document/item, make sure that the content type you are going to change to is associated with the list or library. Otherwise you will get a generic error when loading your page.

Step 1: Make sure SharePoint dlls are available in your local folder

Step 2: Please provide the required inputs such as site URL, List Name, User Name and Password

 #Load SharePoint CSOM Assemblies
 Add-Type -Path "C:\PS\dll\Microsoft.SharePoint.Client.dll"
 Add-Type -Path "C:\PS\dll\Microsoft.SharePoint.Client.Runtime.dll"
 #Variables for Processing
 $SiteUrl = "https://ps.sharepoint.com/sites/test”
 $Password ="****"
 #Setup Credentials to connect
 $Credentials = New-Object Microsoft.SharePoint.Client.SharePointOnlineCredentials($UserName,(ConvertTo-SecureString $Password -AsPlainText -Force))
 #Set up the context
 $Context = New-Object Microsoft.SharePoint.Client.ClientContext($SiteUrl)
 $Context.Credentials = $credentials
 #Filter and Get the List Items using CAML
 $list = $Context.web.Lists.GetByTitle($ListName)
 $Query = [Microsoft.SharePoint.Client.CamlQuery]::CreateAllItemsQuery(1000); 
 $Items = $list.GetItems($Query);
 #$listItem= $list.GetItemById(97709);
 #Get the new content type ID for library/lsit 
    foreach($ct in $list.ContentTypes){
    if($ct.Name -eq "Document"){
        $contentTypeId= $ct.Id
  Write-Host "New Content Type ID."+ $contentTypeId -ForegroundColor Green
   foreach($listItem in $Items)
 # Change the old content type with the new content type at item level and preserve the modified and Modified by 
      Write-Host "Item ID:"$listItem["ID"].ToString();
      write-Host $listItem.ContentType.Name
                     if ($listItem.ContentType.Name -eq "Working Document")
                     $listItem["ContentTypeId"] = $contentTypeId.StringValue
                     $modifiedBy = $listItem["Editor"] #Editor is the internal name of the Modified By column
                     $listItem["Editor"] = $modifiedBy
                     $modified = $listItem["Modified"] #Modified is the internal name of the Modified column
                     $listItem["Modified"] = $modified
     write-host "Item Updated!"  -foregroundcolor Green 
     write-host "$($_.Exception.Message)" -foregroundcolor red 

Hope this helps!