Putting back netstandard targets (#113)

Author: llali

Directory.Build.props

@@ -27,9 +27,11 @@
     <!-- This is the default target framework for all the projects. 
          Individual projects may specify additional target frameworks -->
     <NetfxVersion>net462</NetfxVersion>
+    <NetStandardVersion>netstandard2.1</NetStandardVersion>
+    <NetStandardVersion20>netstandard2.0</NetStandardVersion20>
     <NetCoreVersion>net8.0</NetCoreVersion>
 
-    <TargetFrameworks>$(NetfxVersion);$(NetCoreVersion)</TargetFrameworks>
+    <TargetFrameworks>$(NetStandardVersion);$(NetfxVersion);$(NetCoreVersion);$(NetStandardVersion20)</TargetFrameworks>
     <PreviewRelease Condition="'$(PreviewRelease)' == ''">false</PreviewRelease>
     <VersionProductName>Microsoft SQL Script DOM</VersionProductName>
 

Test/Directory.Build.props

@@ -31,8 +31,8 @@
     <TargetFrameworks>$(NetfxVersion);$(NetCoreVersion)</TargetFrameworks>
 
     <!-- The TargetGroup can be used to express condition that are common to more than one TargetFramework (currently not used)-->
-    <TargetGroup Condition="'$(TargetFramework)'=='net8.0'">netcore</TargetGroup>
-    <TargetGroup Condition="'$(TargetGroup)'==''">netfx</TargetGroup>
+    <TargetGroup Condition="'$(TargetFramework)'=='netstandard2.0' Or '$(TargetFramework)'=='netstandard2.1' Or '$(TargetFramework)'=='netstandard2.2'">netstandard</TargetGroup>
+    <TargetGroup Condition="'$(TargetFramework)'=='netcoreapp3.1' Or '$(TargetFramework)'=='net5.0' Or '$(TargetFramework)'=='net6.0' or '$(TargetFramework)'=='net8.0'">netcore</TargetGroup>
 
     <!-- Enable optimized NuGet restore -->
     <RestoreUseStaticGraphEvaluation>true</RestoreUseStaticGraphEvaluation>