LargeObject1.cs

public class LargeObject : IDisposable
{
    ...

    
    class NativeState
    {
        public bool _disposed;
        public IntPtr _handle1;
        public IntPtr _handle2;
    }

    private NativeState _state;
    // Plus some heavy stuff that we don't want to keep around once the object 
    // is no more referenced

    public LargeObject()
    {
        _state = new NativeState()
        {
            _handle1 = (IntPtr) (DateTime.Now.Ticks),
            _handle2 = (IntPtr) (DateTime.Now.Ticks + 1),
        };

        // this is where we imagine using a PhantomObjectFinalizer 
    }

    public void Dispose()
    {
        if (_state._disposed)
            return;

        Cleanup(_state);
        CleanupIDisposableFields();
    }

    private void CleanupIDisposableFields()
    {
        // call Dispose on all IDisposable fields
    }


    private static void Cleanup(NativeState state)
    {
        if (state._disposed)
            return;
        state._disposed = true;

        Console.WriteLine($"cleanup native resource {state._handle1.ToString()}");
        Console.WriteLine($"cleanup native resource {state._handle2.ToString()}");
        throw new InvalidOperationException("I messed up the cleaning...");
    }
}