Continue supporting .NET Framework. (confluentinc#2342)

DLL is being loaded with .NET Framework 4.6.2, 4.8 and 4.8.1

Author: emasab

CHANGELOG.md

@@ -1,3 +1,10 @@
+# 2.6.1
+
+## Enhancements
+
+* Fix to continue supporting .NET Framework 4.6.2+ in core client library (#2342).
+
+
 # 2.6.0
 
 ## Enhancements

README.md

@@ -34,7 +34,7 @@ client. Thanks Andreas!
 
 confluent-kafka-dotnet is distributed via NuGet. We provide the following  packages:
 
-- [Confluent.Kafka](https://www.nuget.org/packages/Confluent.Kafka/) *[netstandard2.0, net6.0, net8.0]* - The core client library.
+- [Confluent.Kafka](https://www.nuget.org/packages/Confluent.Kafka/) *[netstandard2.0, net462, net6.0, net8.0]* - The core client library.
 - [Confluent.SchemaRegistry.Serdes.Avro](https://www.nuget.org/packages/Confluent.SchemaRegistry.Serdes.Avro/) *[netstandard2.0, net6.0, net8.0]* - Provides a serializer and deserializer for working with Avro serialized data with Confluent Schema Registry integration.
 - [Confluent.SchemaRegistry.Serdes.Protobuf](https://www.nuget.org/packages/Confluent.SchemaRegistry.Serdes.Protobuf/) *[netstandard2.0, net6.0, net8.0]* - Provides a serializer and deserializer for working with Protobuf serialized data with Confluent Schema Registry integration.
 - [Confluent.SchemaRegistry.Serdes.Json](https://www.nuget.org/packages/Confluent.SchemaRegistry.Serdes.Json/) *[netstandard2.0, net6.0, net8.0]* - Provides a serializer and deserializer for working with Json serialized data with Confluent Schema Registry integration.

src/Confluent.Kafka/Confluent.Kafka.csproj

@@ -17,7 +17,7 @@
     <Title>Confluent.Kafka</Title>
     <AssemblyName>Confluent.Kafka</AssemblyName>
     <VersionPrefix>2.6.0</VersionPrefix>
-    <TargetFrameworks>netstandard2.0;net6.0;net8.0</TargetFrameworks>
+    <TargetFrameworks>netstandard2.0;net462;net6.0;net8.0</TargetFrameworks>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
     <SignAssembly>true</SignAssembly>
@@ -30,7 +30,7 @@
     </PackageReference>
   </ItemGroup>
 
-  <ItemGroup>
+  <ItemGroup Condition=" '$(TargetFramework)' == 'netstandard2.0' or '$(TargetFramework)' == 'net462'">
     <PackageReference Include="System.Memory" Version="4.5.0" />
   </ItemGroup>