Demonstrates using an exclusive TaskScheduler to call non-thread-safe code.

ThreadSafeDictionaryWithExclusiveTaskScheduler.cs

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

  public Task AddAsync(K key, V value, CancellationToken cancellationToken = default(CancellationToken)) {
    return TaskScheduler.Factory.StartNew(
      () => this.inner.Add(key, value),
      cancellationToken,
      TaskCreationOptions.None,
      this.exclusiveScheduler);
  }
}