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Update BCL packages from 9.0 to 10.0 #81702

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Migrates all Base Class Library package references from .NET 9.0 to .NET 10.0.

Package Updates

Runtime packages (eng/Version.Details.props, eng/Version.Details.xml):

  • Microsoft.Extensions.* → 10.0.0 (Configuration, DependencyInjection, Logging, Options, Primitives)
  • System.* → 10.0.0 (Collections.Immutable, Text.Json, IO.Pipelines, Reflection.Metadata, Composition, Diagnostics, Security, Resources, Threading)

Tooling packages (eng/Packages.props):

  • Microsoft.ILVerification: 9.0.7 → 10.0.0
  • ILAsm: 9.0.0-rc.2 → 10.0.0
  • System.Drawing.Common: 9.0.0 → 10.0.0

Target Framework Changes

Build configuration (eng/targets/TargetFrameworks.props):

  • NetRoslyn: net9.0 → net10.0
  • NetRoslynAll: maintains net8.0;net9.0;net10.0 for multi-targeting

Documentation (docs/contributing/target-framework-strategy.md):

  • Updated current servicing TFM references
  • Updated VS Code DevKit TFM to net10.0

Infrastructure Updates

CI/CD pipelines: Updated 4 pipeline files to use net10.0 runtime paths and install .NET 10.0.0

Build scripts: Updated PrepareTests paths in prepare-tests.{ps1,sh} and added net10.0 exclusions in test-rebuild.ps1

All 10.0.0 packages are available and validated.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

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Original prompt

Update all BCL (Base Class Library) package references in the repository from version 9.0 to version 10.0. This includes any NuGet package references or dependencies in project files (e.g., .csproj, .props, or .targets files) where the version number is 9.0, and should attempt to migrate these references to 10.0. Ensure that all relevant documentation or build scripts reflecting the BCL version are also updated accordingly. If upgrades result in errors or incompatibilities, document these instances as code comments or in the PR description for attention.

This pull request was created as a result of the following prompt from Copilot chat.

Update all BCL (Base Class Library) package references in the repository from version 9.0 to version 10.0. This includes any NuGet package references or dependencies in project files (e.g., .csproj, .props, or .targets files) where the version number is 9.0, and should attempt to migrate these references to 10.0. Ensure that all relevant documentation or build scripts reflecting the BCL version are also updated accordingly. If upgrades result in errors or incompatibilities, document these instances as code comments or in the PR description for attention.

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Copilot AI changed the title [WIP] Update BCL package references from version 9.0 to 10.0 Update BCL packages from 9.0 to 10.0 Dec 15, 2025
JoeRobich
JoeRobich reviewed Dec 15, 2025
View reviewed changes
eng/Version.Details.xml
</Dependency>
<!-- Necessary for source-build. This allows the live version of the package to be used by source-build. -->
<Dependency Name="Microsoft.Bcl.AsyncInterfaces" Version="9.0.0">
<Dependency Name="Microsoft.Bcl.AsyncInterfaces" Version="10.0.0">
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@JoeRobich JoeRobich Dec 15, 2025

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I think perhaps a better way to accomplish this would be to update our subscription to the Runtime to a .NET 10 channel

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