Improve readability with type aliases

Author: commonsensesoftware

src/AspNetCore/WebApi/src/Asp.Versioning.Mvc.ApiExplorer/ApiVersionDescriptionProviderFactory.cs

@@ -1,21 +1,26 @@
 // Copyright (c) .NET Foundation and contributors. All rights reserved.
 
-namespace Microsoft.AspNetCore.Builder;
+#pragma warning disable SA1135 // Using directives should be qualified
+#pragma warning disable SA1200 // Using directives should be placed correctly
 
 using Asp.Versioning;
 using Asp.Versioning.ApiExplorer;
-using Microsoft.AspNetCore.Routing;
 using Microsoft.Extensions.Options;
 
+namespace Microsoft.AspNetCore.Builder;
+
+using Microsoft.AspNetCore.Routing;
+using Activator = Func<IEnumerable<IApiVersionMetadataCollationProvider>, ISunsetPolicyManager, IOptions<ApiExplorerOptions>, IApiVersionDescriptionProvider>;
+
 internal sealed class ApiVersionDescriptionProviderFactory : IApiVersionDescriptionProviderFactory
 {
     private readonly ISunsetPolicyManager sunsetPolicyManager;
     private readonly IApiVersionMetadataCollationProvider[] providers;
     private readonly IOptions<ApiExplorerOptions> options;
-    private readonly Func<IEnumerable<IApiVersionMetadataCollationProvider>, ISunsetPolicyManager, IOptions<ApiExplorerOptions>, IApiVersionDescriptionProvider> activator;
+    private readonly Activator activator;
 
     public ApiVersionDescriptionProviderFactory(
-        Func<IEnumerable<IApiVersionMetadataCollationProvider>, ISunsetPolicyManager, IOptions<ApiExplorerOptions>, IApiVersionDescriptionProvider> activator,
+        Activator activator,
         ISunsetPolicyManager sunsetPolicyManager,
         IEnumerable<IApiVersionMetadataCollationProvider> providers,
         IOptions<ApiExplorerOptions> options )