ReadAllTerms

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;

using ManagedIrbis;
using ManagedIrbis.Search;

class Program
{
    private static string connectionString = "user=librarian;password=secret;";

    public static TermInfo[] ReadAllTerms
        (
            IIrbisConnection connection,
            string prefix
        )
    {
        var list = new List<TermInfo>();
        var startTerm = prefix;

        var flag = true;
        while (flag)
        {
            var parameters = new TermParameters
            {
                Database = connection.Database,
                StartTerm = startTerm,
                NumberOfTerms = 10000
            };
            var terms = connection.ReadTerms(parameters);
            if (terms.Length == 0)
            {
                break;
            }

            foreach (var term in terms)
            {
                if (!term.Text.StartsWith(prefix))
                {
                    flag = false;
                    break;
                }
                list.Add(term);
            }

            startTerm = terms.Last().Text;
        }

        var result = TermInfo.TrimPrefix(list.ToArray(), prefix);

        return result;
    }

    public static void Main()
    {
        var stopwatch = new Stopwatch();
        stopwatch.Start();

        using (var connection = new IrbisConnection(connectionString))
        {
            var terms = ReadAllTerms(connection, "T=");
            Console.WriteLine("Found: {0}", terms.Length);
        }

        stopwatch.Stop();
        Console.WriteLine("Time elapsed: {0} minute(s)", stopwatch.Elapsed.TotalMinutes);
    }
}