Directory.Build.props

<Project>

  <!-- Fix a RuntimeIdentifier at evaluation time on every platform.

       The Microsoft.AI.Foundry.Local[.Core] package's build/*.targets default
       RuntimeIdentifier to $(NETCoreSdkRuntimeIdentifier) when it is empty. Those
       targets run during build (after restore), so if we leave the RID unset here,
       restore produces a RID-less assets file while build asks for a RID-specific
       target -> NETSDK1047. Setting the RID early keeps restore and build in sync.

       $(NETCoreSdkRuntimeIdentifier) is intentionally NOT used here because
       Directory.Build.props is evaluated before Sdk.props initializes that property.
       Instead, use static OS + architecture detection, which is always available.
       The sample solutions build as AnyCPU, so the host architecture is the only
       input we need. -->
  <PropertyGroup Condition="'$(RuntimeIdentifier)'==''">
    <_OSArch>$([System.Runtime.InteropServices.RuntimeInformation]::OSArchitecture)</_OSArch>

    <RuntimeIdentifier Condition="$([MSBuild]::IsOSPlatform('Windows')) And '$(_OSArch)' == 'X64'">win-x64</RuntimeIdentifier>
    <RuntimeIdentifier Condition="$([MSBuild]::IsOSPlatform('Windows')) And '$(_OSArch)' == 'Arm64'">win-arm64</RuntimeIdentifier>

    <RuntimeIdentifier Condition="$([MSBuild]::IsOSPlatform('OSX')) And '$(_OSArch)' == 'Arm64'">osx-arm64</RuntimeIdentifier>
    <RuntimeIdentifier Condition="$([MSBuild]::IsOSPlatform('OSX')) And '$(_OSArch)' == 'X64'">osx-x64</RuntimeIdentifier>

    <RuntimeIdentifier Condition="$([MSBuild]::IsOSPlatform('Linux')) And '$(_OSArch)' == 'X64'">linux-x64</RuntimeIdentifier>
    <RuntimeIdentifier Condition="$([MSBuild]::IsOSPlatform('Linux')) And '$(_OSArch)' == 'Arm64'">linux-arm64</RuntimeIdentifier>
  </PropertyGroup>

</Project>