SPSite.RootWeb.AllProperties is null Claims Authentication

Question

I just created a new WebApplication & Site Collection in sharepoint.

Note : WebApplication uses Claims Authentication mode, Custom Trusted Identity Provider for my application.

In powershell when i try to access $site.RootWeb.AllProperties it is returning null

$site.RootWeb.AllProperties.Add("a", "1")

You cannot call a method on a null-valued expression. At line:1 char:21

+ $site.RootWeb.AllProperties.Add <<<< ("a","1")

+ CategoryInfo : InvalidOperation: (Add:String) [], RuntimeException

+ FullyQualifiedErrorId : InvokeMethodOnNull

Does anyone knows why this occurs?

Answer 1

This blog provides a good overview of how to work with the SPWeb property bag while also providing links to MSDN. http://bramnuyts.be/2012/01/10/working-with-spwebs-propertybag/

The root of your problem, it seems, is that you are doing SPWeb.AllProperties.Add() instead of SPWeb.AddProperty()

Answer 2

Getting the site using Elevated Privileges fixed the problem

PS C:\windows> [Microsoft.SharePoint.SPSecurity]::RunWithElevatedPrivileges({$s = get-spsite "http://balajig-01"})
PS C:\windows> $s.RootWeb.AllProperties


Name                           Value
----                           ----- 
vti_associatemembergroup       5
vti_extenderversion            14.0.0.6120
vti_associatevisitorgroup      4
vti_associategroups            5;4;3
vti_createdassociategroups     3;4;5
vti_approvallevels             Approved Rejected Pending\ Review
vti_categories                 Travel Expense\ Report Business Competition G...
vti_associateownergroup        3
vti_defaultlanguage            en-us

Thanks anyways