https://groups.google.com/forum/#!topic/jayrock/WR7rMn0fuoc

Program.cs

// https://groups.google.com/forum/#!topic/jayrock/WR7rMn0fuoc

using System;
using System.IO;
using System.Net;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using Jayrock.JsonRpc;

static class Program
{
    static int Main(string[] args)
    {
        try
        {
            var cts = new CancellationTokenSource();
            var task = RunServer(args, cts.Token);
            Console.WriteLine("Press ENTER key to stop.");
            Console.ReadLine();
            cts.Cancel();
            task.Wait();
            return 0;
        }
        catch (Exception e)
        {
            Console.Error.WriteLine(e.GetBaseException().Message);
            return 1;
        }
    }

    public static Task RunServer(string[] prefixes, CancellationToken cancellationToken)
    {
        if (prefixes == null || prefixes.Length == 0)
            throw new ArgumentException("prefixes");

        if (!HttpListener.IsSupported)
            throw new NotSupportedException("Windows XP SP2 or Server 2003 is required.");

        var listener = new HttpListener();
        Array.ForEach(prefixes, listener.Prefixes.Add);
        listener.Start();
        cancellationToken.Register(listener.Stop);
        Console.WriteLine("Listening...");

        var tcs = new TaskCompletionSource<object>();

        listener.GetContextAsync().ContinueWith(async t =>
        {
            try
            {
                while (true)
                {
                    var context = await t;
                    var request = context.Request;
                    var dispatcher = JsonRpcDispatcherFactory.CreateDispatcher(new DemoService());
                    var encoding = Encoding.UTF8; // TODO Handle instead of assuming UTF-8
                    using (var reader = new StreamReader(request.InputStream, encoding))
                    using (var writer = new StringWriter())
                    {
                        dispatcher.Process(reader, writer);
                        writer.Flush();
                        var response = context.Response;
                        response.ContentType = "application/json";
                        response.ContentEncoding = encoding;
                        var buffer = encoding.GetBytes(writer.GetStringBuilder().ToString());
                        response.ContentLength64 = buffer.Length;
                        response.OutputStream.Write(buffer, 0, buffer.Length);
                    }
                    t = listener.GetContextAsync();
                }
            }
            catch (Exception e)
            {
                listener.Close();
                tcs.TrySetException(e);
            }
        });

        return tcs.Task;
    }
}

class DemoService : JsonRpcService
{
    [ JsonRpcMethod("echo", Idempotent = true)]
    [ JsonRpcHelp("Echoes back the object sent as input.") ]
    public object Echo(object obj)
    {
        return obj;
    }
}