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A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11If your .NET library is meant to work across languages whose compilers support the Common Language Specification (CLS), make CLS compliance the baseline for its public API. Keep language-specific features when they materially help your intended users, but isolate and document those exceptions—and offer a CLS-compliant alternative when practical. CLS rules govern the public contract, not private implementation details.
What CLS compliance means for a .NET library
The Common Language Specification (CLS) defines a shared set of features that languages targeting .NET can use. A component whose public contract conforms to those rules can be accessed from assemblies written in languages that support the CLS. It does not mean every .NET language has identical syntax or that the library’s internal code must use only CLS features.
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Microsoft puts the boundary plainly: “The rules for CLS compliance apply only to a component’s public interface, not to its private implementation.” Microsoft’s language-independence guidance therefore makes CLS primarily an API-design decision: consumers see the contract, not your private implementation choices.
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Choose based on who must consume the API
| Your library’s priority | Suitable approach | Trade-off |
|---|---|---|
| Consumers may use different .NET languages and compilers that support the CLS | Use CLS-compliant public signatures as the baseline | Some language-specific features may not be available in the shared contract |
| The library serves a known audience for whom a language-specific feature is important | Keep that feature where it provides material value | The affected API may not be usable from every CLS-supporting language |
| Both broad reach and a specialized feature matter | Expose a compliant route and a clearly identified language-specific extension | More API surface to document and maintain |
This is a design trade-off, not a requirement to make every library language-neutral. A shared contract is valuable when cross-language use is a real requirement; otherwise, avoiding a useful feature solely for theoretical reach may not serve the intended audience.
#1 Best Overall
Keep the compliant contract focused
Review public signatures, especially interfaces
Check public types, methods, properties, fields, and interfaces for features outside the CLS. Microsoft’s examples include UInt32 as a non-compliant type and show a non-compliant unsigned member in an interface. These are examples to prompt review, not a complete checklist of every CLS rule. A CLS-compliant interface cannot include a non-compliant method, so interface design deserves particular care.
Keep private implementation choices private
Private implementation details do not need to conform just because the assembly declares a CLS-compliant public surface. You can use a feature internally while presenting a compliant type or member to consumers, provided the public contract itself meets the rules.
Offer alternatives for deliberate exceptions
If a public member needs a language-specific feature, mark the exception and provide an equivalent compliant member when that makes sense. Make the relationship clear in product documentation so a consumer using another language can find the supported route.
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1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problemsDeclare and check compliance in .NET
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Declare the intended baseline. Add
[assembly: CLSCompliant(true)]when you intend the library’s public surface to be CLS-compliant. The attribute communicates intent; it does not change signatures or make non-compliant APIs compliant. -
Resolve the resulting warnings. Review the public types and members flagged by the compiler or analyzers. Change signatures that should be part of the shared contract, or retain intentional exceptions and mark them explicitly.
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Mark intentional exceptions. Apply
[CLSCompliant(false)]to public types or members that are not compliant. When a compliant alternative exists, document it and explain which consumers may need it.Rank #4
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Check analyzer configuration. CA1014, “Mark assemblies with CLSCompliantAttribute,” is a useful design signal where enabled. Microsoft’s rule table says CA1014 is not enabled by default in .NET 10, so verify your project’s analyzer settings rather than assuming it runs automatically.
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For attribute behavior and examples, see Microsoft’s CLSCompliantAttribute documentation. For the analyzer’s current default status, see CA1014: Mark assemblies with CLSCompliantAttribute.
Quick Recap
A practical decision rule
- Cross-language use is a requirement: design the public API to the CLS and treat warnings as issues to resolve.
- One language is the deliberate target: use the features that best serve that audience, while being explicit about the narrower compatibility.
- You need both: keep a compliant baseline and confine exceptions to the smallest useful set of public members, with compliant alternatives and clear documentation where feasible.
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