fix possible locking issue in PollingWildCardChangeToken, fixes #103997…

… (#104969)
dotnet · Jul 17, 2024 · acfb801 · acfb801
1 parent 1058460
commit acfb801
Showing 1 changed file with 7 additions and 2 deletions.
diff --git a/src/libraries/Microsoft.Extensions.FileProviders.Physical/src/PollingWildCardChangeToken.cs b/src/libraries/Microsoft.Extensions.FileProviders.Physical/src/PollingWildCardChangeToken.cs
@@ -93,15 +93,20 @@ public bool HasChanged
                     return _changed;
                 }
 
-                if (Clock.UtcNow - _lastScanTimeUtc >= PollingInterval)
+                if (ShouldRefresh())
                 {
                     lock (_enumerationLock)
                     {
-                        _changed = CalculateChanges();
+                        if (!_changed && ShouldRefresh())
+                        {
+                            _changed = CalculateChanges();
+                        }
                     }
                 }
 
                 return _changed;
+
+                bool ShouldRefresh() => Clock.UtcNow - _lastScanTimeUtc >= PollingInterval;
             }
         }