Microsoft Windows Search API

Aby móc korzystać w aplikacjach z wbudowanego w Windows search'a należy do projetu dodać referencje Microsoft.Search.Interop. Można ją pobrać wraz z przykładowymi aplikacjami tutaj.
Przeszukiwanie zródeł lokalnych polega na przeszukiwaniu przy pomocy OleDbConnection katalogu SystemIndex. Poniżej zamieszam przykład zastosowania

            CSearchManager manager = new CSearchManager();
            // the SystemIndex catalog is the default catalog that windows uses
            CSearchCatalogManager catalogManager = manager.GetCatalog("SystemIndex");

            // get the ISearchQueryHelper which will help us to build SQL necessary to query the indexer
            CSearchQueryHelper queryHelper = catalogManager.GetQueryHelper();
            //we get which column we can obtain (in this example file path and file name)
            queryHelper.QuerySelectColumns = "System.ItemPathDisplay,System.FileName";

            string dir = @"C:\" //path in which we want search
            // then we add a scope in format of
            queryHelper.QueryWhereRestrictions = "AND scope='file:" + dir + "' AND Contains(System.ItemType,'\".pdf\"') ";//we can search only specyfied type of file in this example pdf


            // Generate SQL from our parameters 
            string sqlQuery = queryHelper.GenerateSQLFromUserQuery(searchPhraze);


            // --- Perform the query ---
            // create an OleDbConnection object which connects to the indexer provider with the windows application
            System.Data.OleDb.OleDbConnection conn = new OleDbConnection(queryHelper.ConnectionString);

            // open it
            conn.Open();

            // now create an OleDB command object with the query we built above and the connection we just opened.
            OleDbCommand command = new OleDbCommand(sqlQuery, conn);

            // execute the command, which returns the results as an OleDbDataReader.
            OleDbDataReader WDSResults = command.ExecuteReader();

            while (WDSResults.Read())
            {
                string filePath = WDSResults.GetString(0); 
                string filename = WDSResults.GetString(1);

                
                });
            }

            WDSResults.Close();
            conn.Close();