C# Debounce

Util.cs

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

/**
 * <summary>C# implementation of JavaScript's setTimeout.</summary>
 */
public static CancellationTokenSource setTimeout(Action callback, int delay = 100)
{
    CancellationTokenSource source = new CancellationTokenSource();
    Task.Delay(delay, source.Token)
        .ContinueWith(task =>
        {
            if (!task.IsCanceled)
            {
                callback();
            }
        });
    return source;
}

/**
 * <summary>C# implementation of JavaScript's clearTimeout.</summary>
 */
public static void ClearTimeout(CancellationTokenSource source)
{
    source.Cancel();
}

/**
 * <summary>Debounces the callback.</summary>
 */
public static Action Debounce(Action callback, int delay = 100)
{
    CancellationTokenSource source = null;
    return () =>
    {
        if (source != null)
        {
            ClearTimeout(source);
        }
        source = setTimeout(() =>
        {
            source = null;
            callback();
        }, delay);
    };
}