Metalama 2026.1.18 is based on 2026.1.17, plus the following changes.

Fixes

• #1644 [Observable] silently dropped the setter body of a field-keyword (semi-auto) property.

Resources

• Milestone
• Full Changelog: release/2026.1.17...release/2026.1.18

Metalama 2026.1.17 is based on 2026.1.16, plus the following changes.

Fixes

• #1636 Fixed a build crash when using an IAspectWeaver-based aspect (e.g. Metalama.Community.Virtuosity) together with Metalama.Patterns.Contracts.
• #1638 Fixed CS0030 ("Cannot convert type 'void' to 'System.Threading.Tasks.Task'") on expression-bodied async void methods overriding Task/ValueTask.
• #1640 Fixed an intermittent design-time RPC hang caused by a lost-wakeup race in ClientEndpoint.

Resources

• Milestone
• Full Changelog: release/2026.1.16...release/2026.1.17

Metalama 2026.1.16 is the general availability (GA) release of the 2026.1 line. It is based on 2026.1.15-rc, plus the following changes.

This release updates Metalama.Compiler to 2026.1.10.

Fixes

• #1630 Scope mismatch exception during a cleanup

Resources

• Milestone
• Full Changelog: release/2026.1.15-rc...release/2026.1.16

Metalama 2026.0.23 is based on 2026.0.22, plus the following changes.

This release updates Metalama.Compiler to 2026.0.13, which upgrades the underlying Roslyn compiler to 5.5.0 (Visual Studio 2026 Version 18.5.2).

Resources

• Full Changelog: release/2026.0.22...release/2026.0.23

Metalama 2026.1.15-rc is based on 2026.1.14-rc and 2026.0.23, plus the following changes.

This release updates Metalama.Compiler to 2026.1.9-rc, which upgrades the underlying Roslyn compiler to 5.5.0 (Visual Studio 2026 Version 18.5.2).

Resources

• Full Changelog: release/2026.1.14-rc...release/2026.1.15-rc

Metalama 2026.1.14-rc is based on 2026.1.13-preview.

This release promotes Metalama to Release Candidate maturity. No functional changes since the previous preview.

This release updates Metalama.Compiler to 2026.1.8-rc.

Resources

• Full Changelog: release/2026.1.13-preview...release/2026.1.14-rc

Metalama 2026.1.13-preview is based on 2026.1.12-preview, plus the following changes.

Fixes

• #1626 Design-time exception in Rider: DesignTimeEntryPointManager throws InvalidCastException.
• #1627 Design-time analysis fails in Rider with "Requested SDK version not found".
• #1628 Aspect-suggested code actions are offered twice in Rider's Alt+Enter menu.

Resources

• Milestone
• Full Changelog: release/2026.1.12-preview...release/2026.1.13-preview

Metalama 2026.1.12-preview is based on 2026.1.11-preview, plus the following changes.

Fixes

• #1624 Fixed RpcService deadlock on TestContext.OnTimeout and ClientEndpoint.Dispose pipe leak mid-connect
• #1622 Fixed introduced constructor missing at design time on an introduced type
• #831 Fixed broken introductions design-time experience in Rider

Resources

• Milestone
• Full Changelog: release/2026.1.11-preview...release/2026.1.12-preview

Metalama 2026.1.11-preview is based on 2026.1.10-preview, plus the following changes.

Enhancements

• #1601 Perf: avoided calling NormalizeWhitespace per generated type in DesignTimeSyntaxTreeGenerator.

Fixes

• #1617 Fixed sporadic design-time RPC errors when Visual Studio projects connect/disconnect during event broadcasts, caused by a race in RpcServiceProviderServerEndpoint where an invocation could be issued before the JSON-RPC listener had started.
• #1615 Fixed missing CodeLens hover tooltip on aspect classes and template/compile-time members.
• #1611 Fixed cross-pipeline mismatch where SerializableTransitiveAspectInstance welded an A-typed aspect with a B-typed AspectClass when upstream compile-time projection diverged between doors, surfacing as LAMA0041 / TargetException.
• #1605 Fixed a side-by-side compatibility issue between Visual Studio Tools for PostSharp/Metalama and Metalama 2026.1, where CodeLens notifications failed with StreamJsonRpc.ConnectionLostException because the cross-version path went through the version-locked RPC layer. Requires updating the VSX to 2026.1.

Resources

• Milestone
• Full Changelog: release/2026.1.10-preview...release/2026.1.11-preview

Metalama 2026.1.10-preview is based on 2026.1.9-preview, plus the following changes.

This release updates Metalama.Compiler to 2026.1.7-preview.

New

• #1590 Added a signatures-only pipeline mode for WPF MarkupCompilePass1 temp compile.

Enhancements

• #1603 Dropped the Roslyn 4.8 build variant and aligned dependency version floors to Visual Studio 17.14.
• #1599 Skip non-observable advice early in AdviceFactory when the design-time scenario does not capture them.

Fixes

• #1606 Fixed MessagePack RPC losing nested polymorphic collection items in round-trip.
• #1602 Fixed LAMA0601 reported when SyntaxTree.FilePath is empty with WPF + WriteHtml + introduction.
• #1597 Fixed MSB3371 caused by parallel multi-TFM builds colliding on the shared MetalamaSourceGenerator.touch file.
• #1588 Fixed WPF MarkupCompilePass1 temp compile failing to see aspect-introduced members.
• #1587 Fixed IAdviceFactory.IntroduceExtensionBlock XML doc listing 'indexers' even though indexers are rejected.
• #1579 Fixed typeof(TSelf) collapsing to the open generic definition when TSelf is the canonical self-instance.

Resources

• Milestone
• Full Changelog: release/2026.1.9-preview...release/2026.1.10-preview