From 35b6d81f7744da672861dd2e72c0130c79dd82c4 Mon Sep 17 00:00:00 2001
From: David Fowler <davidfowl@gmail.com>
Date: Thu, 5 Apr 2018 09:22:46 -0700
Subject: [PATCH] Don't dispose on cancellation (#1859)

- We're already disposing now at the end of enumeration
---
 .../Internal/AsyncEnumeratorAdapters.cs                        | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/src/Microsoft.AspNetCore.SignalR.Core/Internal/AsyncEnumeratorAdapters.cs b/src/Microsoft.AspNetCore.SignalR.Core/Internal/AsyncEnumeratorAdapters.cs
index a04eafba56..adcb911639 100644
--- a/src/Microsoft.AspNetCore.SignalR.Core/Internal/AsyncEnumeratorAdapters.cs
+++ b/src/Microsoft.AspNetCore.SignalR.Core/Internal/AsyncEnumeratorAdapters.cs
@@ -18,9 +18,6 @@ namespace Microsoft.AspNetCore.SignalR.Internal
 
             var subscription = observable.Subscribe(new ChannelObserver<T>(channel.Writer, cancellationToken));
 
-            // Dispose the subscription when the token is cancelled
-            cancellationToken.Register(state => ((IDisposable)state).Dispose(), subscription);
-
             // Make sure the subscription is disposed when enumeration is completed.
             return new AsyncEnumerator<object>(channel.Reader, cancellationToken, subscription);
         }