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Within a PS script, I'm trying to add a site column and add this column to a custom content type.

Here is my script :

add-pssnapin Microsoft.SharePoint.PowerShell -EA 0 function AddFieldToContentType([Microsoft.SharePoint.SPWeb] $web, [string]$contentTypeName, [string]$xmlSchema) { $fieldName = $web.Fields.AddFieldAsXml($xmlSchema) $web.Update() $field = $web.Fields[$fieldName] $ct = $web.AvailableContentTypes[$contentTypeName] $link = new-object Microsoft.SharePoint.SPFieldLink $field $ct.FieldLinks.Add($link) $ct.Update($true) } [Microsoft.SharePoint.SPWeb]$web = get-spweb -Identity http://somewhere [xml]$xml = 'my field schema truncated for readability' AddFieldToContentType $web "my content type name" $xml

This fails at the line $ct.Update($true) with this error :

Exception calling "Update" with "1" argument(s): "The collection cannot be modified."

What's wrong with this code ?

Thanks

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1 Answer 1

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19

AvailableContentTypes is readonly, so you need to use ContentTypes instead.

$field = $web.Fields[$fieldName] $ct = $web.ContentTypes[$contentTypeName] $link = new-object Microsoft.SharePoint.SPFieldLink $field $ct.FieldLinks.Add($link) $ct.Update($true)
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    To add to this, AvailableContentTypes is read only because it is a collection from the current scope, including those of the current website, as well as any parent websites Commented Jul 6, 2011 at 16:09
  • this solved the problem, hovewer, I don't understand the cause, as I'm not changing the content type collection, but the content type itself Commented Jul 6, 2011 at 16:29
  • The Update() method must be looking at the collection that the content type is in and using that in some way. It follows since you can't create a new content type and call Update() without first adding it to a collection - a list or web. AvailableContentTypes gathers them up into a collection for you, but it doesn't give you the collection for the specific web. Commented Jul 6, 2011 at 16:52
  • I get almost this exact same problem: - $ct.update($true) produces an "Access Denied" error, although it does add the Site Column to the Content Type. - however, $ct.update($false) works without a hitch. - not only that, but in both cases, the "update all columns which use this column" is set to Yes. I've no idea why it acts this way. Commented Nov 3, 2016 at 15:29

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