Warn on Blazor components with Dispose()/DisposeAsync() but no interface

[dkamburov]

Add analyzer for Dispose()/DisposeAsync() interface sanity checks

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Adds two new analyzer diagnostics that catch a silent class of bugs where a Blazor component declares a dispose method but the runtime never calls it because the corresponding interface isn't implemented.

Description

Introduce ComponentDisposableSanityAnalyzer to warn when Blazor components declare Dispose() or DisposeAsync() without implementing IDisposable or IAsyncDisposable. Add diagnostics BL0015 and BL0016 with resource strings, and provide thorough analyzer tests for all relevant scenarios.

Fixes #51714

[dotnet-policy-service]

Thanks for your PR, @dkamburov. Someone from the team will get assigned to your PR shortly and we'll get it reviewed.

[Copilot]

Pull request overview

This PR introduces a new Components analyzer that warns when a Blazor component declares Dispose() / DisposeAsync() but does not implement the corresponding disposal interface, helping prevent cleanup logic from silently never running.

Changes:

• Add ComponentDisposableSanityAnalyzer to report new warnings BL0014 (Dispose() without IDisposable) and BL0015 (DisposeAsync() without IAsyncDisposable).
• Add localized descriptor resources and wire them into DiagnosticDescriptors.
• Add unit tests covering the core warning/no-warning scenarios.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
src/Components/Analyzers/src/ComponentDisposableSanityAnalyzer.cs	New analyzer that scans component types for Dispose/DisposeAsync methods and reports BL0014/BL0015.
src/Components/Analyzers/src/DiagnosticDescriptors.cs	Adds the two new DiagnosticDescriptors for BL0014/BL0015.
src/Components/Analyzers/src/Resources.resx	Adds titles/formats/descriptions for the two new diagnostics.
src/Components/Analyzers/test/ComponentDisposableSanityAnalyzerTest.cs	Adds tests validating BL0014/BL0015 reporting behavior.

[dkamburov]

@dotnet-policy-service agree company="Infragistics, Inc"

[Copilot]

Pull request overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

[Copilot]

Pull request overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.