Custom Taxonomy Control to filter taxonomy by Blog ID

BlogTaxonomyControl.cs

	/// <summary>
	/// Custom Sitefinity Taxonomy Control to display taxonomy items for a specific Blog
	/// </summary>
	public class BlogTaxonomyControl : TaxonomyControl
	{
		public Guid ParentBlogID { get; set; }

		/// <summary>
		/// Raises the <see cref="E:System.Web.UI.Control.Load"/> event.
		/// </summary>
		/// <param name="e">The <see cref="T:System.EventArgs"/> object that contains the event data.</param>
		protected override void OnLoad(EventArgs e)
		{
			base.OnLoad(e);

			// this control is specifically for blogs, set the ContentType to match
			this.ContentType = typeof(Telerik.Sitefinity.Blogs.Model.BlogPost);
		}

		/// <summary>
		/// Returns a dictionary where the key is the taxon and value is
		/// the number is the count of the times that the taxon is used(marked)
		/// </summary>
		/// <returns></returns>
		protected override Dictionary<ITaxon, uint> GetTaxaItemsCountForTaxonomy()
		{
			// get all taxonomy items from published blog posts
			Guid taxonomyId = this.TaxonomyId;
			IQueryable<TaxonomyStatistic> queryable = from t in this.CurrentTaxonomyManager.GetStatistics()
													  where ((t.TaxonomyId == taxonomyId) && (t.MarkedItemsCount >= 0)) && 
															(t.StatisticType == Telerik.Sitefinity.GenericContent.Model.ContentLifecycleStatus.Live) && 
															(t.DataItemType == this.ContentType.ToString())
													  select t;

			// is there a TaxaCount maximum?
			if (this.TaxaCount > 0)
			{
				queryable = (from r in queryable
							 orderby r.MarkedItemsCount descending
							 select r).Take<TaxonomyStatistic>(this.TaxaCount);
			}

			// fill a dictionary with the taxa and counts
			Dictionary<ITaxon, uint> dictionary = new Dictionary<ITaxon, uint>();
			foreach (TaxonomyStatistic statistic in queryable)
			{
				// match the taxonomy items to the blog with the specified ID
				if (ParentBlogID != Guid.Empty)
				{
					var posts = App.WorkWith().Blog(ParentBlogID).BlogPosts().Where(t => t.GetValue<TrackedList<Guid>>(this.FieldName).Contains(statistic.TaxonId)).Get();
					if (posts.Count() == 0) continue;
				}

				// add to dictionary
				ITaxon key = this.CurrentTaxonomyManager.GetTaxon(statistic.TaxonId);
				if ((key != null) && !dictionary.ContainsKey(key))
				{
					if (key is HierarchicalTaxon)
					{
						HierarchicalTaxon taxon2 = key as HierarchicalTaxon;
						if (!taxon2.AvailableLanguages.Contains<string>(key.Title.CurrentLanguage.Name) && ((taxon2.AvailableLanguages.Count<string>() != 1) || (taxon2.AvailableLanguages[0] != string.Empty)))
						{
							continue;
						}
					}
					dictionary.Add(key, statistic.MarkedItemsCount);
				}
			}
			return dictionary;
		}
	}