CefSharp.MinimalExample/CefSharp.MinimalExample.OffScreen/SingleThreadSynchronizationContext.cs

/// https://devblogs.microsoft.com/pfxteam/await-synchronizationcontext-and-console-apps/

using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Threading;

namespace CefSharp.MinimalExample.OffScreen
{
    public sealed class SingleThreadSynchronizationContext : SynchronizationContext
    {
        private readonly BlockingCollection<KeyValuePair<SendOrPostCallback, object>> queue =
            new BlockingCollection<KeyValuePair<SendOrPostCallback, object>>();

        public override void Post(SendOrPostCallback d, object state)
        {
            queue.Add(new KeyValuePair<SendOrPostCallback, object>(d, state));
        }

        public void RunOnCurrentThread()
        {
            while (queue.TryTake(out var workItem, Timeout.Infinite))
            {
                workItem.Key(workItem.Value);
            }
        }

        public void Complete()
        {
            queue.CompleteAdding();
        }
    }
}