Unify targetframework properties

Author: dibarbet

Directory.Build.props

@@ -0,0 +1,9 @@
+<Project>
+    <PropertyGroup>
+        <!--
+            Defines the lowest supported target framework for the extension.
+            Used by server download / integration tests to ensure they run when only this SDK is installed.
+        -->
+        <LowestSupportedTargetFramework>net6.0</LowestSupportedTargetFramework>
+    </PropertyGroup>
+</Project>

server/ServerDownload.csproj

@@ -12,7 +12,7 @@
         <!-- It's still PackageReference, so project intermediates are still created. -->
         <MSBuildProjectExtensionsPath>$(RestorePackagesPath)obj/</MSBuildProjectExtensionsPath>
         <!-- We use the lowest supported target framework so we can build and run integration tests against the lowest supported target framework -->
-        <TargetFramework>net6.0</TargetFramework>
+        <TargetFramework>$(LowestSupportedTargetFramework)</TargetFramework>
         <!-- If a package is resolved to a fallback folder, it may not be downloaded.-->
         <DisableImplicitNuGetFallbackFolder>true</DisableImplicitNuGetFallbackFolder>
         <!-- We don't want to build this project, so we do not need the reference assemblies for the framework we chose.-->

test/integrationTests/testAssets/slnWithCsproj/src/app/app.csproj

@@ -4,7 +4,7 @@
  </ItemGroup>
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>$(LowestSupportedTargetFramework)</TargetFramework>
   </PropertyGroup>
 
 </Project>

test/integrationTests/testAssets/slnWithCsproj/test/test.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>$(LowestSupportedTargetFramework)</TargetFramework>
     <Nullable>enable</Nullable>
 
     <IsPackable>false</IsPackable>