Set SharePoint permission on a folder using SPQuery \ CAML

Posted on 2015-02-07
Medium Priority
Last Modified: 2015-02-10
I need to set permissions on a lot of SharePoint folders in a document library but I don't want to have to spin through all folders to find the specific one each time.  I have to set permissions on about 1000 folders and have an XML document where I'm getting the folders and their permissions from.  

I have the script about 90% written using a CAML query to get the specific folder.   (This works fine and returns the specific folder I'm looking for)
        $spQuery = New-Object Microsoft.SharePoint.SPQuery
	 	$spQuery.Query =	"<OrderBy>
								<FieldRef Name=BaseName Ascending=TRUE></FieldRef>
								    <Eq><FieldRef Name=ContentType/><Value Type=Text>Folder</Value></Eq>
								    <Eq><FieldRef Name=BaseName/><Value Type=Text>$folderName</Value></Eq>
		$spQuery.ViewAttributes = "Scope=RecursiveAll"
        $spListItems = $spList.GetItems($spQuery)

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However, when I try to set the $currentFolder, it is an SPFolder instead of SPItem.
			foreach ($spListItem in $spListItems)
				$currentItem = $spListItem.Name
				$folderName = $spListItem.Folder.URL
				$folderName = $folderName.Replace($currentItem,"")
				$RelativeFolderURL = $spListItem.URL
				$currentFolder =$SPWeb.GetFolder($RelativeFolderURL)
			GrantGroupPermission $currentFolder

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And the method to break inheritance and set permissions is only available on an SPItem object
  function GrantGroupPermission($groupName)
   [Microsoft.SharePoint.SPGroupCollection]$spgroups = $web.SiteGroups
   [Microsoft.SharePoint.SPGroup]$spgroup = $spgroups[$groupName]
   $sproleass=new-object Microsoft.SharePoint.SPRoleAssignment([Microsoft.SharePoint.SPPrincipal]$spgroup)
[b][u]#The Next Line Breaks[/u][/b]
[b][u]#This Line Doesn't Work Either[/u][/b]
   Write-Host "Permission provided for group ", $groupName

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I've attached 2 files.  
One that works when I explicitly give it a folder name.
The second is my script that I'm trying to use CAML to get the folder name

I'm hoping someone here will be able to help figure this out.
Question by:skipper68
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LVL 15

Expert Comment

ID: 40597331
Use this:

.item will get you the SPListItem of the folder.

Author Comment

ID: 40598289
Thank you very much for the response.  I tried your suggestion previously, and again just to make sure.  I got the following error(s).
 Unsuccessful attempt to add .item to the $folder object
I've also included a screencap of how it looks without the $folder.item....
Errors without .Item
Thank you again for helping.
LVL 44

Expert Comment

by:Rainer Jeschor
ID: 40598303
which SharePoint version and edition?
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Author Comment

ID: 40598309
SP 2010 Enterprise
LVL 15

Accepted Solution

colly92002 earned 2000 total points
ID: 40599388
Looks like you might be passing the method a null $folder object.

Possibly because of this cast?
GrantGroupPermission $action [Microsoft.SharePoint.SPListItem]$currentFolder

If you have removed that cast, try displaying your folder url etc and make sure your CAML is returning what you expect.

Author Comment

ID: 40599504
I think that was it!  I was casting it to an item instead of letting the object cast itself.  I'm going to run through a couple more to verify but I think that was it.

Author Closing Comment

ID: 40600608
Colly, you rock!  That was exactly it.  

Do you know what the logic is behind why this fails?  In normal programming, you can cast a string as an integer to use it in a calculation.  Any insight as to why this didn't work would be appreciated.
LVL 15

Expert Comment

ID: 40600731
It's because you are casting an object to another type that does not allow it (probably because it is incompatible)  and this results in a null object.

These articles will probably explain it better than I can:

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