Restore deleted Form-WebParts (NewForm.aspx, EditForm.aspx, DispForm.aspx)

If a clever user hits on the idea to delete the form webpart from NewForm.aspx, EditForm.aspx or DispForm.aspx, this can be restored easily with PowerShell. No need to open SharePoint Designer.

Basically a new ListFormWebPart-object must be instanciated, connected with the list and added to the webpartzone of the page. That's it.

Have a look at the following code:

$site = New-Object Microsoft.SharePoint.SPSite -ArgumentList http://sitecollection/sites/site1
$web = $site.OpenWeb()

$list = $web.Lists["My Library"] #title of the regarding list

$webpart = new-object Microsoft.SharePoint.WebPartPages.ListFormWebPart

# assign list to webpart
$webpart.ListId = $list.ID

# possible pagetypes are PAGE_DISPLAYFORM, PAGE_EDITFORM, or PAGE_NEWFORM
# see: https://msdn.microsoft.com/en-us/library/microsoft.sharepoint.webpartpages.listformwebpart.pagetype.aspx
$webpart.PageType = "PAGE_EDITFORM"

# use the absolute link to the form-aspx
$wpm = $web.GetLimitedWebPartManager("http://sitecollection/sites/site1/myLibrary/Forms/EditForm.aspx", [System.Web.UI.WebControls.WebParts.PersonalizationScope]::Shared)

$wpm.AddWebPart($webpart, "Main", 1)

# dispose spweb-object in webpartmanager to avoid memory leaks
$wpm.Web.Dispose()

$web.Dispose()
$site.Dispose()