Demonstrates awaiting on a TaskScheduler

AwaitOnExclusiveTaskScheduler.cs

using Microsoft.VisualStudio.Threading;

public class ThreadSafeDictionary<K, V>
{
  private readonly TaskScheduler exclusiveScheduler = new ConcurrentExclusiveSchedulerPair().ExclusiveScheduler;
  private readonly Dictionary<K, V> inner = new Dictionary<K, V>();

  public async Task AddThenRemoveAsync(K key, V value, CancellationToken cancellationToken = default(CancellationToken)) {
    await this.exclusiveScheduler; // Enabled by Microsoft.VisualStudio.Threading extension method.
    cancellationToken.ThrowIfCancellationRequested();
    this.inner.Add(key, value);
    await Task.Delay(50);
    this.inner.Remove(key);
  }
}