Indexing a Multilist Field in Sitecore 7

When it came time to index a multilist field in Sitecore 7, I didn’t exactly know where to start. Although, I had successfully been able to add a link/droplink field into the index by using the following snippet:

[IndexField("Link Field Name")]
public ID LinkFieldName{ get; set; }

While the code above allows you to index a single item by ID, I needed to index multiple items by ID. I finally got around to double checking the “Developer’s Guide to Item Buckets and Search” documentation on Sitecore SDN and it gave me the clue I needed. IEnumerable is included in the list of automatic type conversions when mapping Sitecore fields to the index. So with that info I could do the following:

[IndexField("Multilist Field Name")]
public IEnumerable<ID> MultilistFieldName { get; set; }

I knew I was on the right track but I was also having problems figuring out how to grab each ID individually in order to use it in a search statement. After some testing I found that the “.Contains()” method does exactly as needed. It allowed me to check if a specific ID is contained in the list of IDs from the multilist field.

using (var context = ContentSearchManager.GetIndex("sitecore_web_index").CreateSearchContext())
{
    var query = context.GetQueryable<SearchResultItem>()
        .Where(
            i => i.MultilistFieldName.Contains(ID.Parse("{00000000-0000-0000-0000-000000000000}"))
            );
}

There we go! Pretty easy once you figure it all out. There is always something new to learn with Sitecore 7.

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