Been fiddling with some script to ADD a value to the PropertyBag for a SharePoint site within Office365.

There’s a great post (and script) on the Microsoft site – for READING all properties :

How to read all property bags in a SharePoint Online Site Collection

But, for adding a new key, I had to fiddle & find an answer.

This post also – mentions the issue with “persisting” values :

Add and Retrieve property bag by CSOM (thanks !!)

NB.   This code (PowerShell) will only ADD a key/value – if not already in place.    (You’ll need to change slightly – to UPDATE the value)

        $rootWeb = $spoCtx.Web
        $spoCtx.Load($rootWeb);
        $spoCtx.ExecuteQuery();

        $allProps = $rootWeb.AllProperties;
        $spoCtx.Load($allProps);
        $spoCtx.ExecuteQuery();

        # DOESN’T WORK !!
        # $allProps.FieldValues.Add(‘KEY’, $value);

        $rootWeb.AllProperties[‘KEY’] = $value;
        $rootWeb.Update();

        $spoCtx.ExecuteQuery();

That’s not TOO tricky in the end – just needed some fiddley syntax to make it work – especially the POWERSHELL bit…

Hope that helps you – it was a battle for me.   

🙂