Override Execute method for a custom Sitecore Conditional Rule

ContactFacetExist.cs

protected override bool Execute(T ruleContext)
{
    Assert.ArgumentNotNull((object)ruleContext, "ruleContext");
    Assert.IsNotNull((object)Tracker.Current, "Tracker.Current must be not null");
    Assert.IsNotNull((object)Tracker.Current.Contact, "Tracker.Current.Contact must be not null");
 
    if (string.IsNullOrWhiteSpace(ContactFacetMemberPath) || Tracker.Current.Contact == null)
        return false;
 
    //Custom method that reads the facet member XML path and using reflection retrieves the value.
    var memberValue = GetFacet(ContactFacetMemberPath, Tracker.Current.Contact);         
    return !string.IsNullOrWhiteSpace(memberValue);
}