Add support for .net6.0 framework

Author: smbecker

src/DotPulsar.Extensions.DependencyInjection/DotPulsar.Extensions.DependencyInjection.csproj

@@ -4,7 +4,7 @@
 		<RootNamespace>DotPulsar</RootNamespace>
 		<PackageTags>$(PackageTags);Pulsar</PackageTags>
 		<Description>DotPulsar.Extensions.DependencyInjection adds support for using DotPulsar with the Microsoft.Extensions.DependencyInjection APIs.</Description>
-		<TargetFrameworks>net7.0;net8.0</TargetFrameworks>
+		<TargetFrameworks>net6.0;net7.0;net8.0</TargetFrameworks>
 		<ImplicitUsings>enable</ImplicitUsings>
 		<Nullable>enable</Nullable>
 		<LangVersion>latest</LangVersion>

src/DotPulsar.Extensions.DependencyInjection/TargetFramework.cs

@@ -0,0 +1,8 @@
+// ReSharper disable CheckNamespace
+
+#if !NET6_0_OR_GREATER
+namespace System.Runtime.CompilerServices
+{
+	internal static class IsExternalInit { }
+}
+#endif

src/DotPulsar.Extensions.OpenTelemetry/DotPulsar.Extensions.OpenTelemetry.csproj

@@ -4,7 +4,7 @@
 		<RootNamespace>DotPulsar</RootNamespace>
 		<PackageTags>$(PackageTags);Pulsar</PackageTags>
 		<Description>DotPulsar.OpenTelemetry integrates DotPulsar with OpenTelemetry APIs.</Description>
-		<TargetFrameworks>net7.0;net8.0</TargetFrameworks>
+		<TargetFrameworks>net6.0;net7.0;net8.0</TargetFrameworks>
 		<ImplicitUsings>enable</ImplicitUsings>
 		<Nullable>enable</Nullable>
 		<LangVersion>latest</LangVersion>

src/DotPulsar.Extensions.Resiliency/DotPulsar.Extensions.Resiliency.csproj

@@ -4,7 +4,7 @@
 		<RootNamespace>DotPulsar</RootNamespace>
 		<PackageTags>$(PackageTags);Pulsar</PackageTags>
 		<Description>DotPulsar.Extensions.Resiliency adds resiliency extensions working with Pulsar.</Description>
-		<TargetFrameworks>net7.0;net8.0</TargetFrameworks>
+		<TargetFrameworks>net6.0;net7.0;net8.0</TargetFrameworks>
 		<ImplicitUsings>enable</ImplicitUsings>
 		<Nullable>enable</Nullable>
 		<LangVersion>latest</LangVersion>

src/DotPulsar.Extensions.Schemas/DotPulsar.Extensions.Schemas.csproj

@@ -4,7 +4,7 @@
 		<RootNamespace>DotPulsar</RootNamespace>
 		<PackageTags>$(PackageTags);Pulsar</PackageTags>
 		<Description>DotPulsar.Extensions.Schemas adds support for using Json and ProtoBuf producers, consumers, and receivers.</Description>
-		<TargetFrameworks>net7.0;net8.0</TargetFrameworks>
+		<TargetFrameworks>net6.0;net7.0;net8.0</TargetFrameworks>
 		<ImplicitUsings>enable</ImplicitUsings>
 		<Nullable>enable</Nullable>
 		<LangVersion>latest</LangVersion>

src/Ulid.protobuf-net/Ulid.protobuf-net.csproj

@@ -3,7 +3,7 @@
 		<RootNamespace>ProtoBuf.Meta</RootNamespace>
 		<PackageTags>$(PackageTags);Ulid;protobuf</PackageTags>
 		<Description>Adds support for Ulid fields within protobuf-net serializable types.</Description>
-		<TargetFrameworks>netstandard2.0;net6.0;net7.0;net8.0</TargetFrameworks>
+		<TargetFrameworks>netstandard2.0;netstandard2.1;net6.0;net7.0;net8.0</TargetFrameworks>
 		<LangVersion>latest</LangVersion>
 		<ImplicitUsings>enable</ImplicitUsings>
 		<Nullable>enable</Nullable>