[dev18.0.x] Fix SDK installation suggestion for already-installed versions - #9843
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Previously, the project retargeting handler would suggest installing an SDK version that was already installed on the system. This occurred because the check for installed SDKs was not properly implemented. Changes: - Add SdkInstallationService to detect globally installed .NET SDKs by querying the Windows registry for both 32-bit and 64-bit SDK installations - Add IRegistry abstraction and RegistryService implementation for testable registry access - Update ProjectRetargetHandler to check if the retarget SDK version is already installed before suggesting installation - Add IEnvironment abstraction and EnvironmentService for testable environment variable access - Add comprehensive unit tests for SdkInstallationService, RegistryService, and EnvironmentService - Simplify IRegistryMock test helper to use string-based keys instead of complex tuple structures - Fix JsonDocument.Parse to use ParseAsync for proper async/await pattern in ProjectRetargetHandler
Replace CLI-based SDK detection with direct Windows registry queries for improved
performance and reliability.
Key changes:
- Create IDotNetEnvironment service to centralize .NET environment queries
- Check installed SDK versions via registry (SOFTWARE\dotnet\Setup\InstalledVersions\{arch}\sdk)
- Detect .NET runtime versions via registry
- Locate dotnet.exe host path with registry fallback to Program Files
- Refactor SetupComponentRegistrationService to use IDotNetEnvironment instead of
NetCoreRuntimeVersionsRegistryReader
- Add ExceptionExtensions.IsCatchable() for safer exception handling
This eliminates the need to spawn dotnet.exe processes for SDK detection
* merged IEnvironmentHelper into IEnvironment * change IsSdkInstalledAsync to IsSdkInstalled * removed unneeded Is64BitOperatingSystem * Moved ExceptionExtensions to non-VS assembly, fixed namespace
drewnoakes
approved these changes
Oct 27, 2025
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Backport of #9834 to dev18.0.x
Requested in: %source_pr_url%#issuecomment-%trigger_comment_id%
/cc @phenning