Enable IAsyncEnumerable for netframework

Author: Christoph Bauer

src/NetMQ.Tests/ClientServer.cs

@@ -82,7 +82,6 @@ public async Task AsyncWithCancellationToken()
             await Assert.ThrowsAnyAsync<OperationCanceledException>(async () => await server.ReceiveStringAsync(source.Token));
         }
 
-#if NETSTANDARD || NET
         [Fact(Timeout = 120)]
         public async Task AsyncEnumerableCanceled()
         {
@@ -155,6 +154,6 @@ public async Task AsyncEnumerable()
 
             Assert.Equal(15002, totalCount);
         }
-#endif
+
     }
 }

src/NetMQ/NetMQ.csproj

@@ -45,9 +45,11 @@
   <ItemGroup Condition=" '$(TargetFrameworkIdentifier)' == '.NETFramework' ">
     <PackageReference Include="Microsoft.NETFramework.ReferenceAssemblies" Version="1.0.3" PrivateAssets="All" />
     <PackageReference Include="System.Threading.Tasks.Extensions" Version="4.6.3" />
+    <PackageReference Include="Microsoft.Bcl.AsyncInterfaces" Version="9.0.6" />
     <Reference Include="System.ServiceModel" />
     <Reference Include="System" />
     <Reference Include="Microsoft.CSharp" />
+    
   </ItemGroup>
 
   <ItemGroup>

src/NetMQ/RoutingIdSocketExtensions.cs

@@ -564,7 +564,6 @@ public static bool TryReceiveString(this IRoutingIdSocket socket, TimeSpan timeo
 
         #region AsyncEnumerable
 
-#if NETSTANDARD || NET
 
         /// <summary>
         /// Provides a consuming IAsyncEnumerable for receiving messages from the socket.
@@ -583,7 +582,6 @@ public static bool TryReceiveString(this IRoutingIdSocket socket, TimeSpan timeo
             }
         }
 
-#endif  
 
         #endregion