How to generate a ClientContext from SiteId in SharePoint Online? - sharepoint-online

Question

I have a SiteId and I want to generate a ClientContext to fetch all the groups of that particular site. But I am not able to find a way to generate a ClientContext from the SiteId same we do in SharePoint on-premises.
Is there a way to generate a ClientContext from SiteId in SharePoint Online or we need the URL only?
I want to achieve something like this:
using(var context = new ClientContext(new GUId(siteId))
{
//TODO
}

Answer 1

You can get your ClientContext in two steps:
search the site by its ID using the search API
create a client context using the site's URL
Here's some PowerShell doing exactly this. I'm using the PnP Cmdlets out of convenience, similar results can also be achieved using plain CSOM.
# this is your site's ID
$siteId = "a20d2341-1b4f-47ed-8180-24a5c31adfa9"
# basically any known site URL - the root is probably fine
$anySiteUrl = "https://<yourtenant>.sharepoint.com"
$credential = Get-Credential
Connect-PnPOnline –Url $anySiteUrl –Credentials $credential
# search for site by ID
$site = Submit-PnPSearchQuery -Query "SiteID:$siteId AND ContentClass=STS_Site"
if ($site.ResultRows.Count -eq 1)
{
# URL to use for "real" connection
$siteUrl = $site.ResultRows[0].Path
Connect-PnPOnline –Url $siteUrl –Credentials $credential
$currentSite = Get-PnPSite
# and there is your ClientContext
$ctx = Get-PnPContext
$web = $currentSite.RootWeb
$ctx.Load($web)
$ctx.Load($web.SiteGroups)
$ctx.ExecuteQuery()
# here are your groups
$web.SiteGroups
}
(Note: you must install the SharePointPnPPowerShellOnline PowerShell module for this code to run.)