From dfcaf417005575df4a7e74cb562f89c964d7d689 Mon Sep 17 00:00:00 2001
From: David Fowler <davidfowl@gmail.com>
Date: Mon, 14 Jun 2021 23:08:29 -0700
Subject: [PATCH] Seal nested classes (#54196)

---
 .../src/HostFactoryResolver.cs                                | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/libraries/Microsoft.Extensions.HostFactoryResolver/src/HostFactoryResolver.cs b/src/libraries/Microsoft.Extensions.HostFactoryResolver/src/HostFactoryResolver.cs
index a49a7b780ab..12516f600b6 100644
--- a/src/libraries/Microsoft.Extensions.HostFactoryResolver/src/HostFactoryResolver.cs
+++ b/src/libraries/Microsoft.Extensions.HostFactoryResolver/src/HostFactoryResolver.cs
@@ -169,7 +169,7 @@ private static bool IsFactory<TReturn>(MethodInfo? factory)
             return (IServiceProvider?)servicesProperty?.GetValue(host);
         }
 
-        private class HostingListener : IObserver<DiagnosticListener>, IObserver<KeyValuePair<string, object?>>
+        private sealed class HostingListener : IObserver<DiagnosticListener>, IObserver<KeyValuePair<string, object?>>
         {
             private readonly string[] _args;
             private readonly MethodInfo _entryPoint;
@@ -321,7 +321,7 @@ public void OnNext(KeyValuePair<string, object?> value)
                 }
             }
 
-            private class StopTheHostException : Exception
+            private sealed class StopTheHostException : Exception
             {
 
             }
-- 
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