.NET targeting projects should reference Microsoft.Windows.SDK.NET.Ref instead (#1471)

Author: AArnott

test/Microsoft.Windows.CsWin32.Tests/MyReferenceAssemblies.cs

@@ -1,30 +1,36 @@
 // Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT license. See LICENSE file in the project root for full license information.
 
-internal static class MyReferenceAssemblies
-{
 #pragma warning disable SA1202 // Elements should be ordered by access - because field initializer depend on each other
-    private static readonly ImmutableArray<PackageIdentity> AdditionalLegacyPackages = ImmutableArray.Create(
-        new PackageIdentity("Microsoft.Windows.SDK.Contracts", "10.0.22621.2428"));
 
-    private static readonly ImmutableArray<PackageIdentity> AdditionalModernPackages = AdditionalLegacyPackages.AddRange(ImmutableArray.Create(
+internal static class MyReferenceAssemblies
+{
+    private static readonly ImmutableArray<PackageIdentity> AdditionalModernPackages = [
         ExtraPackages.Unsafe,
         ExtraPackages.Memory,
-        ExtraPackages.Registry));
+        ExtraPackages.Registry,
+    ];
+
+    private static readonly ImmutableArray<PackageIdentity> AdditionalLegacyPackagesNetFX = [
+        new PackageIdentity("Microsoft.Windows.SDK.Contracts", "10.0.22621.2428"),
+    ];
+
+    private static readonly ImmutableArray<PackageIdentity> AdditionalLegacyPackagesNET = [
+        new PackageIdentity("Microsoft.Windows.SDK.NET.Ref", "10.0.22621.57"),
+    ];
 
-    internal static readonly ReferenceAssemblies NetStandard20 = ReferenceAssemblies.NetStandard.NetStandard20.AddPackages(AdditionalModernPackages);
-#pragma warning restore SA1202 // Elements should be ordered by access
+    internal static readonly ReferenceAssemblies NetStandard20 = ReferenceAssemblies.NetStandard.NetStandard20.AddPackages([.. AdditionalLegacyPackagesNetFX, .. AdditionalModernPackages]);
 
     internal static class NetFramework
     {
-        internal static readonly ReferenceAssemblies Net35 = ReferenceAssemblies.NetFramework.Net35.WindowsForms.AddPackages(AdditionalLegacyPackages);
-        internal static readonly ReferenceAssemblies Net472 = ReferenceAssemblies.NetFramework.Net472.WindowsForms.AddPackages(AdditionalModernPackages);
+        internal static readonly ReferenceAssemblies Net35 = ReferenceAssemblies.NetFramework.Net35.WindowsForms.AddPackages(AdditionalLegacyPackagesNetFX);
+        internal static readonly ReferenceAssemblies Net472 = ReferenceAssemblies.NetFramework.Net472.WindowsForms.AddPackages([.. AdditionalLegacyPackagesNetFX, .. AdditionalModernPackages]);
     }
 
     internal static class Net
     {
-        internal static readonly ReferenceAssemblies Net80 = ReferenceAssemblies.Net.Net80.AddPackages(AdditionalModernPackages);
-        internal static readonly ReferenceAssemblies Net90 = ReferenceAssemblies.Net.Net90.AddPackages(AdditionalModernPackages);
+        internal static readonly ReferenceAssemblies Net80 = ReferenceAssemblies.Net.Net80.AddPackages([.. AdditionalLegacyPackagesNET, .. AdditionalModernPackages]);
+        internal static readonly ReferenceAssemblies Net90 = ReferenceAssemblies.Net.Net90.AddPackages([.. AdditionalLegacyPackagesNET, .. AdditionalModernPackages]);
     }
 
     internal static class ExtraPackages