Class IndexSearcher

Implements search over a single IndexReader.

Applications usually need only call the inherited Search(Query, Int32) or Search(Query, Filter, Int32) methods. For performance reasons it is recommended to open only one IndexSearcher and use it for all of your searches.

NOTE: IndexSearcher instances are completely thread safe, meaning multiple threads can call any of its methods, concurrently. If your application requires external synchronization, you should not synchronize on the IndexSearcher instance; use your own (non-Lucene) objects instead.

Inheritance
System.Object
Searcher
IndexSearcher
Inherited Members
Namespace:
Assembly: Lucene.Net.NetCore.dll
Syntax
public class IndexSearcher : Searcher, Searchable, IDisposable, IDisposable

Constructors

Name Description
IndexSearcher(IndexReader)

Creates a searcher searching the provided index

Note that the underlying IndexReader is not closed, if IndexSearcher was constructed with IndexSearcher(IndexReader r). If the IndexReader was supplied implicitly by specifying a directory, then the IndexReader gets closed.

IndexSearcher(IndexReader, IndexReader[], Int32[])

Expert: directly specify the reader, subReaders and their DocID starts

NOTE: This API is experimental and might change in incompatible ways in the next release
IndexSearcher(Directory)

Creates a searcher searching the index in the named directory, with readOnly=true
IndexSearcher(Directory, Boolean)

Creates a searcher searching the index in the named directory. You should pass readOnly=true, since it gives much better concurrent performance, unless you intend to do write operations (delete documents or change norms) with the underlying IndexReader.

Properties

Name Description
IndexReader

Return the IndexReader this searches.

MaxDoc
reader_ForNUnit

Methods

Name Description
Dispose(Boolean)
Doc(Int32)
Doc(Int32, FieldSelector)
DocFreq(Term)
Explain(Weight, Int32)
GatherSubReaders(Collections.Generic.IList<IndexReader>, IndexReader)
Rewrite(Query)
Search(Weight, Filter, Collector)
Search(Weight, Filter, Int32)
Search(Weight, Filter, Int32, Sort)
Search(Weight, Filter, Int32, Sort, Boolean)

Just like Search(Weight, Filter, Int32, Sort), but you choose whether or not the fields in the returned FieldDoc instances should be set by specifying fillFields.

NOTE: this does not compute scores by default. If you need scores, create a TopFieldCollector instance by calling Create(Sort, Int32, Boolean, Boolean, Boolean, Boolean) and then pass that to Search(Weight, Filter, Collector).

SetDefaultFieldSortScoring(Boolean, Boolean)

By default, no scores are computed when sorting by field (using Search(Query, Filter, Int32, Sort)). You can change that, per IndexSearcher instance, by calling this method. Note that this will incur a CPU cost.