Sitecore Lucene Facet

Search code

var searchIndex = ContentSearchManager.GetIndex("MySearchIndex"); // Get the search index
var searchPredicate = BuildSearchPredicate(searchRequest); // Build the search predicate 

using (var searchContext = searchIndex.CreateSearchContext()) // Get a context of the search index
{
    var searchResults = searchContext.GetQueryable<SearchModel>().Where(searchPredicate); // Search the index for items which match the predicate

    var searchFacets = searchContext.GetQueryable<SearchModel>().Where(searchPredicate).FacetOn(x => x.Category).GetFacets();

    // Category facets
    var categoryFacets = searchFacets.Categories.Where(x => x.Name == "categoryfacet").FirstOrDefault(); // Get the custom categoryfacet facet list

    if (categoryFacets != null)
    {
        foreach (var facet in categoryFacets.Values.Where(x => x.Name != null))
        {
            results.CategoryFacets.Add(new SearchFacet
            {
                Count = facet.AggregateCount,
                Value = facet.Name
            });
        }
    }

    var pagedResults = searchResults.Page((searchRequest.Page - 1), searchRequest.PerPage).GetResults();
}

public class SearchFacet
{
    public string Value { get; set; }
    public int Count { get; set; }
}

public class SearchModel
{
    [IndexField("__smallupdateddate")]
    public DateTime LastUpdated { get; set; }

    [IndexField("_name")]
    public string ItemName { get; set; }

    [IndexField("_displayname")]
    public string DisplayName { get; set; }

    [IndexField("_templatename")]
    public string TemplateName { get; set; }

    [IndexField("introduction")]
    public string Introduction { get; set; }

    [IndexField("text")]
    public string Maintext { get; set; }

    [IndexField("exclude_from_search")]
    public bool ExcludeFromSearch { get; set; }

    [IndexField("page_description")]
    public string PageDescription { get; set; }

    [IndexField("categoryfacet")]
    public string Category { get; set; }

    [IndexField("customtitle")]
    public string Title { get; set; }
}