Pretzel.Logic.Templating.Context.SiteContextGenerator.BuildTagsAndCategories C# (CSharp) Method

        private static void BuildTagsAndCategories(SiteContext context)
        {
            var tags = new Dictionary<string, List<Page>>();
            var categories = new Dictionary<string, List<Page>>();

            foreach (var post in context.Posts)
            {
                if (post.Tags != null)
                {
                    foreach (var tagName in post.Tags)
                    {
                        if (tags.ContainsKey(tagName))
                        {
                            tags[tagName].Add(post);
                        }
                        else
                        {
                            tags.Add(tagName, new List<Page> { post });
                        }
                    }
                }

                if (post.Categories != null)
                {
                    foreach (var categoryName in post.Categories)
                    {
                        AddCategory(categories, categoryName, post);
                    }
                }
            }

            context.Tags = tags.Select(x => new Tag { Name = x.Key, Posts = x.Value }).OrderBy(x => x.Name).ToList();
            context.Categories = categories.Select(x => new Category { Name = x.Key, Posts = x.Value }).OrderBy(x => x.Name).ToList();
        }