Zzz – Rev 1

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

namespace Zzz.Utilities
{
    public class ScheduledContinuation : IDisposable
    {
        #region Constructors, Destructors and Finalizers

        public void Dispose()
        {
            if (_cancellationTokenSource != null)
            {
                _cancellationTokenSource?.Cancel();
                _cancellationTokenSource = null;
            }
        }

        #endregion

        #region Private Delegates, Events, Enums, Properties, Indexers and Fields

        private CancellationTokenSource _cancellationTokenSource;

        private Task _task;

        #endregion

        #region Public Methods

        public void Schedule(TimeSpan delay, System.Action execute, CancellationToken cancellationToken)
        {
            try
            {
                if (_task != null)
                {
                    _cancellationTokenSource?.Cancel();
                    _cancellationTokenSource = null;
                    _task = null;
                }
            }
            catch
            {
                // Ignore errors.
            }
            finally
            {
                _cancellationTokenSource = CancellationTokenSource.CreateLinkedTokenSource(cancellationToken);
            }

            _task = Task.Delay(delay, _cancellationTokenSource.Token)
                .ContinueWith(task =>
                {
                    try
                    {
                        execute.Invoke();
                    }
                    catch (Exception exception) when (exception is ObjectDisposedException ||
                                                      exception is OperationCanceledException)
                    {
                    }
                }, _cancellationTokenSource.Token);
        }

        public void Schedule(int delay, System.Action execute, CancellationToken cancellationToken)
        {
            try
            {
                if (_task != null)
                {
                    _cancellationTokenSource?.Cancel();
                    _cancellationTokenSource = null;
                    _task = null;
                }
            }
            catch
            {
                // Ignore errors.
            }
            finally
            {
                _cancellationTokenSource = CancellationTokenSource.CreateLinkedTokenSource(cancellationToken);
            }

            _task = Task.Delay(delay, _cancellationTokenSource.Token)
                .ContinueWith(task =>
                {
                    try
                    {
                        execute.Invoke();
                    }
                    catch (Exception exception) when (exception is ObjectDisposedException ||
                                                      exception is OperationCanceledException)
                    {
                    }
                }, _cancellationTokenSource.Token);
        }

        #endregion
    }
}

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