Add RazorLangVersion 9 (#40348)

Author: jjonescz

src/RazorSdk/Targets/Sdk.Razor.CurrentVersion.targets

@@ -44,18 +44,30 @@ Copyright (c) .NET Foundation. All rights reserved.
 
   <!-- Resolve the TFM-specific attributes conditionally. -->
   <Choose>
-      <When Condition=" '$(TargetFrameworkIdentifier)' == '.NETCoreApp' AND $([MSBuild]::VersionGreaterThanOrEquals('$(TargetFrameworkVersion)', '8.0')) ">
-        <PropertyGroup>
-          <_TargetingNETCoreApp30OrLater>true</_TargetingNETCoreApp30OrLater>
-          <_TargetingNET50OrLater>true</_TargetingNET50OrLater>
-          <_TargetingNET60OrLater>true</_TargetingNET60OrLater>
-          <_TargetingNET70OrLater>true</_TargetingNET70OrLater>
-          <_TargetingNET80OrLater>true</_TargetingNET80OrLater>
-          <UseRazorSourceGenerator Condition="'$(Language)' == 'C#' AND '$(UseRazorSourceGenerator)' == '' ">true</UseRazorSourceGenerator>
-          <RazorLangVersion Condition="'$(RazorLangVersion)' == '' ">8.0</RazorLangVersion>
-        </PropertyGroup>
-      </When>
-      <When Condition=" '$(TargetFrameworkIdentifier)' == '.NETCoreApp' AND $([MSBuild]::VersionGreaterThanOrEquals('$(TargetFrameworkVersion)', '7.0')) ">
+    <When Condition=" '$(TargetFrameworkIdentifier)' == '.NETCoreApp' AND $([MSBuild]::VersionGreaterThanOrEquals('$(TargetFrameworkVersion)', '9.0')) ">
+      <PropertyGroup>
+        <_TargetingNETCoreApp30OrLater>true</_TargetingNETCoreApp30OrLater>
+        <_TargetingNET50OrLater>true</_TargetingNET50OrLater>
+        <_TargetingNET60OrLater>true</_TargetingNET60OrLater>
+        <_TargetingNET70OrLater>true</_TargetingNET70OrLater>
+        <_TargetingNET80OrLater>true</_TargetingNET80OrLater>
+        <_TargetingNET90OrLater>true</_TargetingNET90OrLater>
+        <UseRazorSourceGenerator Condition="'$(Language)' == 'C#' AND '$(UseRazorSourceGenerator)' == '' ">true</UseRazorSourceGenerator>
+        <RazorLangVersion Condition="'$(RazorLangVersion)' == '' ">9.0</RazorLangVersion>
+      </PropertyGroup>
+    </When>
+    <When Condition=" '$(TargetFrameworkIdentifier)' == '.NETCoreApp' AND $([MSBuild]::VersionGreaterThanOrEquals('$(TargetFrameworkVersion)', '8.0')) ">
+      <PropertyGroup>
+        <_TargetingNETCoreApp30OrLater>true</_TargetingNETCoreApp30OrLater>
+        <_TargetingNET50OrLater>true</_TargetingNET50OrLater>
+        <_TargetingNET60OrLater>true</_TargetingNET60OrLater>
+        <_TargetingNET70OrLater>true</_TargetingNET70OrLater>
+        <_TargetingNET80OrLater>true</_TargetingNET80OrLater>
+        <UseRazorSourceGenerator Condition="'$(Language)' == 'C#' AND '$(UseRazorSourceGenerator)' == '' ">true</UseRazorSourceGenerator>
+        <RazorLangVersion Condition="'$(RazorLangVersion)' == '' ">8.0</RazorLangVersion>
+      </PropertyGroup>
+    </When>
+    <When Condition=" '$(TargetFrameworkIdentifier)' == '.NETCoreApp' AND $([MSBuild]::VersionGreaterThanOrEquals('$(TargetFrameworkVersion)', '7.0')) ">
       <PropertyGroup>
         <_TargetingNETCoreApp30OrLater>true</_TargetingNETCoreApp30OrLater>
         <_TargetingNET50OrLater>true</_TargetingNET50OrLater>