Added musings on runnig as Console app.

NTwain/AsyncPump.cs

@@ -0,0 +1,50 @@
+//using System;
+//using System.Collections.Generic;
+//using System.Linq;
+//using System.Text;
+//using System.Threading;
+//using System.Windows.Threading;
+
+//namespace NTwain
+//{
+//    // from http://blogs.msdn.com/b/pfxteam/archive/2012/01/20/10259049.aspx
+
+//    /// <summary>
+//    /// Provides a pump that supports running asynchronous methods on the current thread.
+//    /// </summary>
+//    public static class AsyncPump
+//    {
+//        /// <summary>
+//        /// Runs the specified asynchronous function.
+//        /// </summary>
+//        /// <param name="func">The asynchronous function to execute.</param>
+//        /// <exception cref="System.ArgumentNullException">func</exception>
+//        /// <exception cref="System.InvalidOperationException">No task provided.</exception>
+//        public static void Run(Func<Task> func)
+//        {
+//            if (func == null) throw new ArgumentNullException("func");
+
+//            var prevCtx = SynchronizationContext.Current;
+//            try
+//            {
+//                var syncCtx = new DispatcherSynchronizationContext();
+//                SynchronizationContext.SetSynchronizationContext(syncCtx);
+
+//                var t = func();
+//                if (t == null) throw new InvalidOperationException();
+
+//                var frame = new DispatcherFrame();
+//                t.ContinueWith(_ => { frame.Continue = false; },
+//                    TaskScheduler.Default);
+//                Dispatcher.PushFrame(frame);
+
+//                t.GetAwaiter().GetResult();
+//            }
+//            finally
+//            {
+//                SynchronizationContext.SetSynchronizationContext(prevCtx);
+//            }
+
+//        }
+//    }
+//}