SpellChecker.Net.Search.Spell.SpellChecker.AddGram C# (CSharp) Method

        private static void AddGram(System.String text, Document doc, int ng1, int ng2)
        {
            int len = text.Length;
            for (int ng = ng1; ng <= ng2; ng++)
            {
                System.String key = "gram" + ng;
                System.String end = null;
                for (int i = 0; i < len - ng + 1; i++)
                {
                    System.String gram = text.Substring(i, (i + ng) - (i));
                    doc.Add(new Field(key, gram, Field.Store.NO, Field.Index.NOT_ANALYZED));
                    if (i == 0)
                    {
                        doc.Add(new Field("start" + ng, gram, Field.Store.NO, Field.Index.NOT_ANALYZED));
                    }
                    end = gram;
                }
                if (end != null)
                {
                    // may not be present if len==ng1
                    doc.Add(new Field("end" + ng, end, Field.Store.NO, Field.Index.NOT_ANALYZED));
                }
            }
        }