I am trying below powershell script for change wiki content

       Add-PSSnapin microsoft.sharepoint.powershell  -ea silentlycontinue

$web = Get-SPWeb "http://dooku/enterprisewiki"
$list = $web.Lists["Site Pages"]

function upgradefeature($search,$replace)

foreach ($item in $list.items)

 if ($item["ows_WikiField"].contains($search))

  do {write-host -NoNewline .;Start-Sleep -m 10;} while ($item.file.CheckOutStatus -eq "None")

  $item["ows_WikiField"] = $item["ows_WikiField"].replace($search ,$replace );

  sleep 1
  $item.file.CheckIn("checked in by administrator");

  write-host $item.name "modified" $search "replace with" $replace   -foregroundcolor red



$replace1 = "enterprisewiki/pages/"

$search1 = "techs/Procedures%20%20Policies/"
upgradefeature $search1 $replace1 

This script works fine for me. When i create another custom wiki library name 'page-test' and try this code with change of this line

  $list = $web.Lists["page-test"]

it shows me error

You cannot call a method on a null-valued expression. At C:\Users\wikilinks\Desktop\Test.ps1:13 char:37 + if ($item["ows_WikiField"].contains <<<< ($search)) + CategoryInfo : InvalidOperation: (contains:String) [], RuntimeException + FullyQualifiedErrorId : InvokeMethodOnNull

why this custom wiki library not getting this field ows_WikiField or there is some other issue? please help me. thanks

2 Answers 2


Are you sure the WikiField has content? I'd replace

if ($item["ows_WikiField"].contains($search)) 


if ($item["ows_WikiField"] -and $item["ows_WikiField"].contains($search)) 
  • thanks per for reply but i have wiki pages with content. so why wikifield not found or it's give me null reference. Mar 30, 2012 at 7:11

SP2010 wiki page content field is called WikiField. Drop the ows_.


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