linq - Sitecore 搜索 : Get results term by term

Question

在这里，我试图获取多个术语的搜索结果。说 fulltext="Lee jeans"，然后 regexresult={"lee","jeans"}。

代码:

IProviderSearchContext searchContext = index.CreateSearchContext();
IQueryable<SearchItem> scQuery = searchContext.GetQueryable<SearchItem>();
var predicate = PredicateBuilder.True<SearchItem>();

   //checking if the fulltext includes terms within " "
                    var regexResult = SearchRegexHelper.getSearchRegexResult(fulltext);

                    regexResult.Remove(" ");

                    foreach (string term in regexResult)
                    {
                        predicate = predicate.Or(p => p.TextContent.Contains(term));
                    }
                    scQuery = scQuery.Where(predicate);

IEnumerable<SearchHit<SearchItem>> results = scQuery.GetResults().Hits;

results=sortResult(results);

排序基于站点核心字段:

  switch (query.Sort)
  {
    case SearchQuerySort.Date:
    results = results.OrderBy(x => GetValue(x.Document, FieldNames.StartDate));
    break;
    case SearchQuerySort.Alphabetically:
    results = results.OrderBy(x => GetValue(x.Document, FieldNames.Profile));
    break;
    case SearchQuerySort.Default:
    default:
    results = results.OrderByDescending(x => GetValue(x.Document, FieldNames.Updated));
    break;
}

现在，我需要先获得“lee”的结果并对它们进行排序，然后找到“jeans”的结果并对其进行排序。最终的搜索结果将首先包含“lee”的串联排序项目集，然后是“jeans”的排序项目。

因此我们必须首先获得“lee”的结果，然后是“jeans”的结果

有没有一种方法可以逐项获得结果？

Answer 1

您可以使用 Query-Time Boosting 来提高术语的相关性，从而影响排名:

• Sitecore 7: Six Types of Search Boosting
• Lucene Boost With LINQ in Sitecore 7 ContentSearch

你想给第一个词最高的提升，然后逐渐减少每个附加词:

var regexResult = SearchRegexHelper.getSearchRegexResult(fulltext);
regexResult.Remove(" ");
float boost = regexResult.Count();

foreach (string term in regexResult)
{
    predicate = predicate.Or(p => p.TextContent.Contains(term)).Boost(boost--);
}

编辑:不可能在同一查询中进行提升和排序，至少，排序将撤消由于提升而返回的基于“相关性”的排序。

另一种方法是多次搜索并连接返回单个列表的结果。效率不高，因为您实际上是在进行多次搜索:

IProviderSearchContext searchContext = index.CreateSearchContext();
var items = new List<SearchResultItem>();

var regexResult = SearchRegexHelper.getSearchRegexResult(fulltext);

regexResult.Remove(" ");

foreach (string term in regexResult)
{
    var results = searchContext.GetQueryable<SearchResultItem>()
                                   .Where(p => p.Content.Contains(term));
    SortSearchResults(results); //results passed in by reference, no need to return object to set it back to itself

    items.AddRange(results);
}

注意:以上没有考虑结果集之间的重复。