Umb 8.6.1

Upgrading the code from a V7 site to V8 I have a class called by an UmbracoApiController which needs to get a list of children of a particular node.

To get the ContentService I've had to use :-

using Umbraco.Core.Composing;
IContentService contentService = Current.Services.ContentService;

which is not what the docs say here: https://our.umbraco.com/documentation/reference/management/services/contentservice/

However, contentService only has a GetPagedChildren, it doesn't have the old GetChildren which V7 did.

All I want this for is to hold in an array or list so I can compare a value in each child with the value I get from the API to see if it exists.

Is there a better way to do this? I'm also aware that this is looking at the DB directly. I have a suspicion there's a way to look at the cache instead which would be quicker but can't find any info.

Any comments or advice would be appreciated.

/ Craig