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Fix closure in HttpConnectionPoolManager.StartMonitoringNetworkChanges #50487

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Apr 15, 2021
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Fix closure in HttpConnectionPoolManager.StartMonitoringNetworkChanges #50487

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19 changes: 11 additions & 8 deletions ...aries/System.Net.Http/src/System/Net/Http/SocketsHttpHandler/HttpConnectionPoolManager.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -166,17 +166,20 @@ public void StartMonitoringNetworkChanges()

// Monitor network changes to invalidate Alt-Svc headers.
// A weak reference is used to avoid NetworkChange.NetworkAddressChanged keeping a non-disposed connection pool alive.
var poolsRef = new WeakReference<ConcurrentDictionary<HttpConnectionKey, HttpConnectionPool>>(_pools);
NetworkAddressChangedEventHandler networkChangedDelegate = delegate
{
if (poolsRef.TryGetTarget(out ConcurrentDictionary<HttpConnectionKey, HttpConnectionPool>? pools))
NetworkAddressChangedEventHandler networkChangedDelegate;
{ // scope to avoid closure if _networkChangeCleanup != null
var poolsRef = new WeakReference<ConcurrentDictionary<HttpConnectionKey, HttpConnectionPool>>(_pools);
networkChangedDelegate = delegate
{
foreach (HttpConnectionPool pool in pools.Values)
if (poolsRef.TryGetTarget(out ConcurrentDictionary<HttpConnectionKey, HttpConnectionPool>? pools))
{
pool.OnNetworkChanged();
foreach (HttpConnectionPool pool in pools.Values)
{
pool.OnNetworkChanged();
}
}
}
};
};
}

var cleanup = new NetworkChangeCleanup(networkChangedDelegate);

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