Who contributed to .NET on June 18, 2026?

7 developers shipped this update, including rolfbjarne, JoasE, Abde1rahman1, ajcvickers, Evangelink, wtgodbe, and Copilot.

What were the notable .NET updates?

[tests] Replace httpbin.org with an in-proc HTTP server to improve reliability, [assembly-preparer] Create a new tool to replace pre-mark custom linker steps, and Allow runtime constants in precompiled queries.

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The Wire · Showcase

MACIOS ELIMINATES TEST FLAKINESS WITH IN-PROC HTTP SERVER, EFCORE FIXES QUERY PERFORMANCE AND UPDATE BUGS

By RepoJournal · Filed 06:05 UTC on June 18, 2026 · About .NET

7 people shipped this

Evangelink @Evangelink 3 cited

rolfbjarne @rolfbjarne 2 cited

JoasE @JoasE 1 cited

Abde1rahman1 @Abde1rahman1 1 cited

ajcvickers @ajcvickers 1 cited

wtgodbe @wtgodbe 1 cited

Copilot @Copilot 1 cited

The biggest wins across .NET today come from killing external dependencies in test infrastructure and fixing two critical EF Core bugs that break real-world scenarios.

The macios team shipped a heavyweight infrastructure change: replacing all httpbin.org dependencies in tests with a lightweight in-proc HTTP server [1], eliminating the network flakiness that's plagued test reliability. This is the kind of unsexy work that pays dividends for months. In the same repo, they're building an 'assembly-preparer' tool [2] to offload custom linker work to a dedicated build step, gated behind `PrepareAssemblies=true`. Meanwhile, EF Core landed two critical fixes: `ExecuteUpdate` now returns correct row counts instead of -1 on open connections by flipping NOCOUNT OFF [4], and Dictionary<string,object> properties with explicit column types (like `jsonb`) are now correctly recognized instead of throwing shared-type entity errors [5]. The latter fix required promoting several pubternal types to public, which is a sign the issue was fundamental. EF Core also added support for runtime constants in precompiled queries [3], moving expensive operations to compile time. The SDK continues its MSTest migration sprint across template engine and command-line test projects [6], [7], [8], while aspnetcore addressed a critical gap: WebViewRenderer now properly handles all Blazor render modes as no-ops instead of throwing `NotSupportedException` [10]. The aspnetcore quarantine workflow was also tightened to distinguish between real regressions and genuinely flaky tests [9], preventing false auto-quarantines that mask actual failures.

Action items

→ Pull the ExecuteUpdate fix [ref:7] if you're using bulk update operations on open connections dotnet/efcore [plan]
→ Test your Dictionary<string,object> property mappings with explicit column types after upgrading EF Core dotnet/efcore [monitor]
→ If you maintain xUnit test projects in SDK, watch for the MSTest migration pattern [ref:13], [ref:14], [ref:15] and adapt accordingly dotnet/sdk [plan]
→ Update Blazor Hybrid apps (MAUI) to confirm WebViewRenderer render modes work after the fix [ref:20] dotnet/aspnetcore [monitor]

References

[1] [tests] Replace httpbin.org with an in-proc HTTP server to improve reliability. ↗ dotnet/macios
[2] [assembly-preparer] Create a new tool to replace pre-mark custom linker steps. ↗ dotnet/macios
[3] Allow runtime constants in precompiled queries ↗ dotnet/efcore
[4] Fix ExecuteUpdate returning -1 on open connections by setting NOCOUNT OFF ↗ dotnet/efcore
[5] Honor explicit store type when discovering Dictionary<string,object> ↗ dotnet/efcore
[6] Migrate Microsoft.TemplateEngine.TemplateLocalizer.Core.UnitTests to MSTest.Sdk on MTP ↗ dotnet/sdk
[7] Migrate Microsoft.TemplateEngine.Utils.UnitTests to MSTest.Sdk on MTP ↗ dotnet/sdk
[8] Migrate System.CommandLine.StaticCompletions.Tests to MSTest.Sdk ↗ dotnet/sdk
[9] Quarantine only flaky tests, not consistent regressions ↗ dotnet/aspnetcore
[10] Override ResolveComponentForRenderMode in WebViewRenderer to treat all render modes as no-ops ↗ dotnet/aspnetcore

Quick answers

What shipped in .NET on June 18, 2026?: The biggest wins across .NET today come from killing external dependencies in test infrastructure and fixing two critical EF Core bugs that break real-world scenarios. In total, 50 commits and 43 pull requests landed.
Who contributed to .NET on June 18, 2026?: 7 developers shipped this update, including rolfbjarne, JoasE, Abde1rahman1, ajcvickers, Evangelink, wtgodbe, and Copilot.
What were the notable .NET updates?: [tests] Replace httpbin.org with an in-proc HTTP server to improve reliability, [assembly-preparer] Create a new tool to replace pre-mark custom linker steps, and Allow runtime constants in precompiled queries.

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