using System.Threading; namespace System { internal abstract class DisposableBase : IDisposable { public abstract class Finalizable : DisposableBase { ~Finalizable() { DisposeInternal(false); } } private int _disposedValue; protected bool Disposed => _disposedValue != 0; protected abstract void Dispose(bool disposing); private void DisposeInternal(bool disposing) { if (Interlocked.Exchange(ref _disposedValue, 1) != 1) Dispose(disposing); } public void Dispose() { DisposeInternal(true); GC.SuppressFinalize(this); } } }