Extensions for dealing with async tasks

TaskExtensions.cs

using System;
using System.Threading;
using System.Threading.Tasks;

public static class TaskExtensions
{
    // Forward result of task if it completes before given timeout. Otherwise,
    // return default(T). The original task will remain running until it completes.
    public static async Task<T> TimeoutAfter<T>(this Task<T> task, TimeSpan timeout)
    {
        var cts = new CancellationTokenSource(timeout);
        try
        {
            return await task.ContinueWith(completedTask => completedTask.GetAwaiter().GetResult(),
                cts.Token,
                TaskContinuationOptions.ExecuteSynchronously,
                TaskScheduler.Default);
        }
        catch (OperationCanceledException)
        {
            if (cts.IsCancellationRequested)
            {
                return default(T);
            }
            else
            {
                throw;
            }
        }
    }
}