Use the NonCapturingTimer helper (#25183)

* Use the NonCapturingTimer helper

* Formatting...

Author: davidfowl

src/SignalR/server/StackExchangeRedis/src/Internal/AckHandler.cs

@@ -5,6 +5,7 @@
 using System.Collections.Concurrent;
 using System.Threading;
 using System.Threading.Tasks;
+using Microsoft.Extensions.Internal;
 
 namespace Microsoft.AspNetCore.SignalR.StackExchangeRedis.Internal
 {
@@ -19,26 +20,7 @@ internal class AckHandler : IDisposable
 
         public AckHandler()
         {
-            // Don't capture the current ExecutionContext and its AsyncLocals onto the timer
-            bool restoreFlow = false;
-            try
-            {
-                if (!ExecutionContext.IsFlowSuppressed())
-                {
-                    ExecutionContext.SuppressFlow();
-                    restoreFlow = true;
-                }
-
-                _timer = new Timer(state => ((AckHandler)state).CheckAcks(), state: this, dueTime: _ackInterval, period: _ackInterval);
-            }
-            finally
-            {
-                // Restore the current ExecutionContext
-                if (restoreFlow)
-                {
-                    ExecutionContext.RestoreFlow();
-                }
-            }
+            _timer = NonCapturingTimer.Create(state => ((AckHandler)state).CheckAcks(), state: this, dueTime: _ackInterval, period: _ackInterval);
         }
 
         public Task CreateAck(int id)

src/SignalR/server/StackExchangeRedis/src/Microsoft.AspNetCore.SignalR.StackExchangeRedis.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
     <Description>Provides scale-out support for ASP.NET Core SignalR using a Redis server and the StackExchange.Redis client.</Description>
@@ -8,6 +8,7 @@
   <ItemGroup>
     <Compile Include="$(SignalRSharedSourceRoot)SystemTextJsonExtensions.cs" Link="Internal\SystemTextJsonExtensions.cs" />
     <Compile Include="$(SignalRSharedSourceRoot)MemoryBufferWriter.cs" Link="Internal\MemoryBufferWriter.cs" />
+    <Compile Include="$(SharedSourceRoot)NonCapturingTimer\*.cs" />
   </ItemGroup>
 
   <ItemGroup>