Add mechanism to clear ServiceProviderCache (#27189)

src/EFCore/Infrastructure/Internal/EntityFrameworkMetrics.cs

@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 using System.Diagnostics.Metrics;
+using Microsoft.EntityFrameworkCore.Internal;
 
 namespace Microsoft.EntityFrameworkCore.Infrastructure.Internal;
 

src/EFCore/Infrastructure/Internal/InfrastructureExtensions.cs

@@ -47,4 +47,10 @@
 
         return service;
     }
+
+    /// <summary>
+    ///     Clears the internal Entity Framework service provider cache.
+    /// </summary>
+    public static void ClearServiceProviderCache(this DatabaseFacade databaseFacade)
+        => EntityFrameworkMetrics.ClearServiceProviderCache();
 }

src/EFCore/Internal/ServiceProviderCache.cs

@@ -200,4 +200,12 @@ private static bool ApplyServices(IDbContextOptions options, ServiceCollection s
 
         return false;
     }
+
+    /// <summary>
+    ///     This is an internal API that supports the Entity Framework Core infrastructure and not subject to
+    ///     the same compatibility standards as public APIs. It may be changed or removed without notice in
+    ///     any release. You should only use it directly in your code with extreme caution and knowing that
+    ///     doing so can result in application failures when updating to a new Entity Framework Core release.
+    /// </summary>
+    public virtual void Clear() => _configurations.Clear();
 }

test/EFCore.Tests/ServiceProviderCacheTest.cs

@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 using Microsoft.EntityFrameworkCore.Diagnostics.Internal;
+using Microsoft.EntityFrameworkCore.Infrastructure.Internal;
 using Microsoft.EntityFrameworkCore.Internal;
 
 namespace Microsoft.EntityFrameworkCore;
@@ -327,4 +328,20 @@ public override void PopulateDebugInfo(IDictionary<string, string> debugInfo)
                 => debugInfo["Fake2"] = "1";
         }
     }
+
+    [ConditionalFact]
+    public void Service_provider_cache_can_be_cleared()
+    {
+        var cache = ServiceProviderCache.Instance;
+        var options = new DbContextOptionsBuilder().UseInMemoryDatabase("TestDB").Options;
+
+        cache.GetOrAdd(options, providerRequired: false);
+
+        EntityFrameworkMetrics.ClearServiceProviderCache();
+
+        var field = typeof(ServiceProviderCache).GetField("_configurations", BindingFlags.NonPublic | BindingFlags.Instance);
+        var dict = (System.Collections.IDictionary)field.GetValue(cache);
+
+        Assert.Equal(0, dict.Count);
+    }
 }