Question

I am using Lunece.net 2.0.5 version.
I want to open and display all the records in the index file in a grid (table) format in an ASP.NET web application, and also provide edit option for each cell in that grid.
But I don’t know how to read each row from Index file.

I used code below-

   private List<String> GetIndexTerms(string indexFolder)
        {
            List<String> termlist = new List<string>();
            IndexReader reader = IndexReader.Open(indexFolder, false);
            TermEnum terms = reader.Terms();
            while (terms.Next())
            {
                Term term = terms.Term();
                String termText = term.Text();
                int frequency = reader.DocFreq(term);
                termlist.Add(termText);
            }
            reader.Close();
            return termlist;
        }

but it returns list of each term and here I am unable to aggregate data by each row (record).

Let me know if there is way to read file by each row or I need to update version of Lucene that I am currently using.

Also please provide any links to Lucene.net’s better documentation websites.

Answer 1

You can read all the records/rows (documents in Lucene terminology) directly from the index without searching

var reader =  IndexReader.Open(dir);
for (int i = 0; i < reader.MaxDoc(); i++)
{
    if (reader.IsDeleted(i)) continue;

    Document d =  reader.Document(i);
    var fieldValuePairs =  d.GetFields()
                            .Select(f => new { 
                                  Name = f.Name(), 
                                  Value = f.StringValue() })
                            .ToArray();
}

PS: v2.0.5 is very old. try latest & greatest Lucene.Net