Hi,

You should be able to use a similar technique to the one mentioned in Kunal's blog post. In this instance though you'd want to intercept IVisitorGroupCriterionRepository. If you create a class which implements that interface like this:

public class FilterVisitorGroupCriteria : IVisitorGroupCriterionRepository
{
    private readonly IVisitorGroupCriterionRepository _instance;
    public FilterVisitorGroupCriteria(IVisitorGroupCriterionRepository instance)
    {
        _instance = instance;
    }

    public IEnumerable<VisitorGroupCriterion> List()
    {
        //Get the list of criteria from the default implementation
        var initialCriteriaList = _instance.List();
        foreach (var criterion in initialCriteriaList)
        {
            //Add your filtering here and return the criteria you want to keep
            yield return criterion;
        }
    }
}

Then register it as an interceptor in your startup.cs like this:

services.Intercept<IVisitorGroupCriterionRepository>((a, b) => new FilterVisitorGroupCriteria(b));

You should then be able to do whatever filtering you need to to exclude the criteria you're not interested in.

Aha, thanks Paul!
Excellent, I was hoping there was a similar way to perform this. This seems very simple to implement. Have my upvote :)