Auto correct the query before sending it to your search engine

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Auto correct a query before sending it to your search engine

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autocorrect.cs

public string AutoCorrect(string query)
{
	if (query.Length < 5)
	{
		return query;
	}

	SpellCheckClient spellCheckClient = new SpellCheckClient(new ApiKeyServiceClientCredentials("Your_BING_SpellCheck_Key_Here"));
	HttpOperationResponse<SpellCheckModel> result = spellCheckClient.SpellCheckerWithHttpMessagesAsync(text: query, mode: "spell", setLang: ContentLanguage.PreferredCulture.TwoLetterISOLanguageName).Result;

	IList<SpellingFlaggedToken> tokens = result.Body.FlaggedTokens;

	if (tokens.Count == 0)
	{
		return query;
	}

	string autoCorrect = query;
	int diff = 0;
	
	foreach (SpellingFlaggedToken problemToken in tokens)
	{
		int offset = problemToken.Offset;
		int originalTokenLength = problemToken.Token.Length;

		SpellingTokenSuggestion suggestionToken = problemToken.Suggestions[0];

		if (suggestionToken.Score < .5)
		{
			continue;
		}

		string suggestion = suggestionToken.Suggestion;

		int lengthDiff = suggestion.Length - originalTokenLength;

		autoCorrect = autoCorrect.Substring(0, offset + diff) + suggestion + autoCorrect.Substring(offset + diff + originalTokenLength);

		diff += lengthDiff;
	}

	return autoCorrect;
}