Remove unnecessary Alias

EntityFrameworkCore.Jet.sln

@@ -42,7 +42,6 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "System.Data.Jet.Performance
 EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "build help", "build help", "{20B764C9-8664-4609-A743-8CF32BA6CA69}"
 	ProjectSection(SolutionItems) = preProject
-		Directory.Build.targets = Directory.Build.targets
 		NuGet.Config = NuGet.Config
 	EndProjectSection
 EndProject

docs/DevNotes.md

@@ -22,11 +22,6 @@
     - C:\Program Files\Common Files\System\ado
     - C:\Program Files (x86)\Common Files\System\ado
 
-## Directory.Build.targets
-- Used due to conflict between the EF Core 2.2 and .NET Core 3.1 versions of IAsyncGrouping<,> & IAsyncEnumerable<>.  Invoked via setting an Alias attribute on the appropriate PackageReference.
-- Affects SharedTypeExtensions.cs
-- Likely is not be needed after upgrading to use EF Core 3.1 on .NET Core 3.1
-
 ## Test Design Guidelines
 - Consider extracting out the following settings to a single, global test configuration file:
     - Provider [string]: "Microsoft.ACE.OLEDB.15.0"

src/EFCore.Jet/EFCore.Jet.csproj

@@ -65,10 +65,4 @@
   <ItemGroup>
     <Service Include="{508349B6-6B84-4DF5-91F0-309BEEBAD82D}" />
   </ItemGroup>
-
-
-  <!-- Will need an alias when using EFCore 2.2 & .NET Core 3.1 (Alias via Directory.Build.targets) -->
-  <ItemGroup Condition="'$(TargetFramework)' == 'netcoreapp3.1'">
-    <PackageReference Include="System.Interactive.Async" Version="3.2.0" Alias="SystemInteractiveAsync" />
-  </ItemGroup>
 </Project>

src/Shared/SharedTypeExtensions.cs

@@ -1,8 +1,4 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
-#if NETCOREAPP3_1
-extern alias SystemInteractiveAsync;
-#endif
-
 using System.Collections.Generic;
 using System.Diagnostics;
 using System.Linq;
@@ -65,17 +61,11 @@ namespace System
 
         public static bool IsGrouping(this Type type) => IsGrouping(type.GetTypeInfo());
 
-#if NETCOREAPP3_1
+        // TODO: Is this method ever actually called?
-        private static bool IsGrouping(TypeInfo type)
-            => type.IsGenericType
-               && (type.GetGenericTypeDefinition() == typeof(IGrouping<,>)
-                   || type.GetGenericTypeDefinition() == typeof(SystemInteractiveAsync::System.Linq.IAsyncGrouping<,>));
-#else
         private static bool IsGrouping(TypeInfo type)
                     => type.IsGenericType
                        && (type.GetGenericTypeDefinition() == typeof(IGrouping<,>)
                            || type.GetGenericTypeDefinition() == typeof(IAsyncGrouping<,>));
-#endif
 
         public static Type UnwrapEnumType(this Type type)
         {
@@ -102,15 +92,9 @@ namespace System
             return sequenceType;
         }
 
-#if NETCOREAPP3_1
-        public static Type TryGetSequenceType(this Type type)
-            => type.TryGetElementType(typeof(IEnumerable<>))
-               ?? type.TryGetElementType(typeof(SystemInteractiveAsync::System.Collections.Generic.IAsyncEnumerable<>));
-#else
         public static Type TryGetSequenceType(this Type type)
             => type.TryGetElementType(typeof(IEnumerable<>))
                ?? type.TryGetElementType(typeof(IAsyncEnumerable<>));
-#endif
 
         public static Type TryGetElementType(this Type type, Type interfaceOrBaseType)
         {