Unable to get the specific list/library contenttypes csom powershell

Question

I am unable to get the specific list/library contenttypes using csom powershell.

Getting error:"The collection has not been initialized. It has not been requested or the request has not been executed. It may need to be explicitly requested."

Below is code I used to get content type collection:

    $Context = New-Object Microsoft.SharePoint.Client.ClientContext($siteUrl)  
    $Context.Credentials = $credentials
    $Context.ExecuteQuery()

    $Web= $Context.Web
    $Context.Load($Web)
    $Context.ExecuteQuery()


    $listsColl=$Web.Lists
    $Context.Load($listsColl)
    $Context.ExecuteQuery()

    $contentTypeColl=$Context.Site.RootWeb.ContentTypes
    $Context.Load($contentTypeColl)
    $Context.ExecuteQuery()

    $CT=$contentTypeColl | where {$_.Id -eq "0x010100793AA7D56406304698C72BB5734F0C25"}
    $Context.Load($CT)
    $Context.ExecuteQuery()     

    $list=$listsColl.GetByTitle("1_Uploaded Files")
    $Context.Load($list)
    $Context.ExecuteQuery()

Answer 1

Sample script to get list Content Types using SharePoint Online CSOM for your reference:

Add-Type -Path "C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\16\ISAPI\Microsoft.SharePoint.Client.dll"
Add-Type -Path "C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\16\ISAPI\Microsoft.SharePoint.Client.Runtime.dll"

#Variables for Processing
$SiteUrl = "https://xxx.sharepoint.com/sites/xxx/"

$UserName="[email protected]"
$Password ="xxx"

#Setup Credentials to connect
$Credentials = New-Object Microsoft.SharePoint.Client.SharePointOnlineCredentials($UserName,(ConvertTo-SecureString $Password -AsPlainText -Force))

#Set up the context
$Context = New-Object Microsoft.SharePoint.Client.ClientContext($SiteUrl)
$Context.Credentials = $credentials
$Context.ExecuteQuery()
$listsColl=$Context.Web.Lists
$Context.Load($listsColl)
$Context.ExecuteQuery()
$list=$listsColl.GetByTitle("testdoc1")
$Context.Load($list)
$Context.ExecuteQuery()
$Contenttypes = $list.ContentTypes
$context.Load($Contenttypes)
try
{
    $context.ExecuteQuery()
    Write-Host "Successfully retrived list content types" -foregroundcolor black -backgroundcolor green
}
catch
{
    Write-Host "Error while getting the $ListName List content types $_.Exception.Message" -foregroundcolor black -backgroundcolor Red  
}

Write-Host "Displaying $ListName List content type started....." -foregroundcolor black -backgroundcolor yellow  
foreach($contentType in $Contenttypes)
{
    Write-Host $contentType.Name
}
Write-Host "Displaying List Content types Completed" -foregroundcolor black -backgroundcolor Green 

Reference:

https://www.sharepoint-journey.com/get-list-content-types-in-ofice-365-using-powershell-and-csom.html

Answer 2

So the point is.
This DOES NOT WORK

$contentTypeColl | where {$_.Id -eq "0x010100793AA7D56406304698C72BB5734F0C25"}

This WORKS

$contentTypeColl | foreach { $_.Id } | where { $_ -eq "0x010100793AA7D56406304698C72BB5734F0C25"}

But I don't know why.