gistfile1.txt

public class LazySearchService : ISearchService
{
    public readonly ISearchService innerService;

    public LazySearchService(ISearchService innerService)
    {
        this.innerService = innerService;
    }

    public ISearchResult Search(SearchCriteria criteria)
    {
        var hash = criteria.GetHashCode().ToString();

        if (!Sitecore.Context.Items.Contains(hash))
        {
            Sitecore.Context.Items.Add(hash, innerService.Search(criteria));
        }

        return Sitecore.Context.Items[hash] as ISearchResult;
    }
}