During the search, a search query can be checked for spelling errors in words. To enable spelling correction in search queries, the Enabled property of the spelling corrector options is set to true. By default, the spelling correction is disabled.
The spelling corrector considers the following types of misprints: adding a character, deleting a character, replacing a character, and, optionally, transposing two adjacent characters.
The SpellingCorrectorOptions class contains the following properties:
- MaxMistakeCount is the maximum number of mistakes possible in each word of a search query. The default value is 2.
- OnlyBestResults is a value indicating whether only the best results will be returned by the spelling corrector. The default value is false.
- OnlyBestResultsRange is the maximum exceeding of the minimum number of mistakes that are found by the spelling corrector. The default value is 0.
- ConsiderTranspositions is a value indicating whether the spelling corrector must consider transposition of two adjacent characters as a single mistake (true) or two mistakes (false). The default value is true.
The following example shows how to perform a search using the spelling correction.
string indexFolder = @"c:\MyIndex\"; string documentsFolder = @"c:\MyDocuments\"; // Creating an index in the specified folder Index index = new Index(indexFolder); // Indexing documents from the specified folder index.Add(documentsFolder); // Creating a search options instance SearchOptions options = new SearchOptions(); options.SpellingCorrector.Enabled = true; // Enabling the spelling correction options.SpellingCorrector.MaxMistakeCount = 1; // Setting the maximum number of mistakes options.SpellingCorrector.OnlyBestResults = true; // Enabling the option for only the best results of the spelling correction // Search for the word "Rleativity" containing a spelling error // The word "Relativity" will be found that differs from the search query in two transposed letters SearchResult result = index.Search("Rleativity", options);
You may easily run the code from documentation articles and see the features in action in our GitHub examples:
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