public ContentData Add(ContentData contentData)
{
int id = (_dictionary.Keys.Count > 0) ? _dictionary.Keys.Max() + 1 : 1;
var content = contentData.MapToContent(id);
content.Id = id;
content.CreatedAt = DateTime.Now;
content.UpdatedAt = content.CreatedAt;
_dictionary.Add(id, content);
return(Get(id));
}
