Optimizely CMS - Extension methods for Listing content used on a page and visitor groups used in content

UsefulExtensions.cs

using EPiServer;
using EPiServer.Core;
using EPiServer.Personalization.VisitorGroups;
using System;
using System.Collections.Generic;
using System.Linq;

namespace CodeArt.Optimizely.Extensions
{
    public static class UsefulExtensions.cs
    {
        ///<summary>
        /// Lists all content (typically blocks) used in content areas and xhtmlstrings on a content item, recursively (blocks in blocks, etc)
        ///</summary>
        public static IEnumerable<IContent> FetchReferencedContentRecursively(this IContentRepository repo, IContent c)
        {
            yield return c;
            foreach (var p in c.Property)
            {
                if (p.Value == null) continue;
                if (p.PropertyValueType == typeof(ContentArea))
                {
                    var ca = p.Value as ContentArea;
                    if (ca == null) continue;
                    foreach (var f in ca.Items)
                    {
                        foreach (var y in repo.FetchReferencedContentRecursively(repo.Get<IContent>(f.ContentLink)))
                            yield return y;
                    }
                }
                else if (p.PropertyValueType == typeof(XhtmlString))
                {
                    var ca = p.Value as XhtmlString;
                    if (ca == null) continue;
                    foreach (var f in ca.Fragments.Where(fr => fr is EPiServer.Core.Html.StringParsing.ContentFragment))
                    {
                        var j = f as EPiServer.Core.Html.StringParsing.ContentFragment;
                        foreach (var y in repo.FetchReferencedContentRecursively(repo.Get<IContent>(j.ContentLink)))
                            yield return y;
                    }
                }
            }

        }
       
    
        /// <summary>
        /// Analyzes which visitor groups are used in an IContent and returns a list of those groups.
        /// </summary>
        public static IEnumerable<VisitorGroup> ExtractVisitorGroups(this IVisitorGroupRepository vgRepo,IContent c)
        {
            foreach (var p in c.Property)
            {
                if (p.Value == null) continue;
                if (p.PropertyValueType == typeof(ContentArea))
                {
                    var ca = p.Value as ContentArea;
                    if (ca == null) continue;
                    foreach (var f in ca.Items.Where(l => l.AllowedRoles != null && l.AllowedRoles.Any()))
                    {
                        //Match! This page uses the visitor groups in l.AllowedRoles. Record.
                        foreach (var r in f.AllowedRoles)
                        {
                            yield return vgRepo.Load(Guid.Parse(r));
                        }
                    }
                }
                else if (p.PropertyValueType == typeof(XhtmlString))
                {
                    var ca = p.Value as XhtmlString;
                    if (ca == null) continue;
                    foreach (var f in ca.Fragments.Where(fr => fr is EPiServer.Core.Html.StringParsing.PersonalizedContentFragment))
                    {

                        var j = f as EPiServer.Core.Html.StringParsing.PersonalizedContentFragment;
                        var roles = j.GetRoles();
                        foreach (var r in roles)
                        {
                            yield return vgRepo.Load(Guid.Parse(r));
                        }
                    }
                }
            }
        }
        
        
    }
}