Microsoft.AspNet.SignalR.Infrastructure.Disposer.Set C# (CSharp) Method

        public void Set(IDisposable disposable)
        {
            if (disposable == null)
            {
                throw new ArgumentNullException("disposable");
            }

            object originalFieldValue = Interlocked.CompareExchange(ref _disposable, disposable, null);
            if (originalFieldValue == null)
            {
                // this is the first call to Set() and Dispose() hasn't yet been called; do nothing
            }
            else if (originalFieldValue == _disposedSentinel)
            {
                // Dispose() has already been called, so we need to dispose of the object that was just added
                disposable.Dispose();
            }
            else
            {
#if !PORTABLE && !NETFX_CORE
                // Set has been called multiple times, fail
                Debug.Fail("Multiple calls to Disposer.Set(IDisposable) without calling Disposer.Dispose()");
#endif
            }
        }

        public void SetDisposesIfShouldDispose()
        {
            bool disposed = false;
            var disposable = new DisposableAction(() => { disposed = true; });
            var disposer = new Disposer();

            Assert.False(disposed);
            disposer.Dispose();
            
            disposer.Set(disposable);
            Assert.True(disposed);
        }