// Fields
    private TimerCallback _callback;
    private bool _disposed;
    private int _iDisposable;
    private TimeSpan _interval;
    private int _max;
    private ArrayList _resources;
    private Timer _timer;

// Methods
    internal ResourcePool(TimeSpan interval, int max)
    {
        this._interval = interval;
        this._resources = new ArrayList(4);
        this._max = max;
        this._callback = new TimerCallback(this.TimerProc);
    }

public void Dispose()
    {
        this.Dispose(true);
    }

private void Dispose(bool disposing)
    {
        lock (this)
        {
            if (!this._disposed)
            {
                if (this._resources != null)
                {
                    foreach (IDisposable disposable in this._resources)
                    {
                        disposable.Dispose();
                    }
                    this._resources.Clear();
                }
                if (this._timer != null)
                {
                    this._timer.Dispose();
                }
                this._disposed = true;
                if (disposing)
                {
                    GC.SuppressFinalize(this);
                }
            }
        }
    }

~ResourcePool()
    {
        this.Dispose(false);
    }
// 其它省略了，不是这篇的重点
}