Why is this change binary compatible and not source compatible?

[WizardBrony]

Type of issue

Other (describe below)

Description

This question is just one example where I am confused by the compatibility indictors for the listed .NET breaking changes. If I understand the change correctly, nothing changed with the ObjectResult.StatusCode API itself, so everything will compile the same, but the run-time behavior in this scenario (returning a T in a controller action that declares the return type ActionResult) changed. Doesn't that mean this change is binary incompatible and source compatible according to the documentation's definition?

• Binary compatible - Existing binaries will load and execute successfully without recompilation, and the run-time behavior won't change.
• Source compatible - Source code will compile successfully without changes when targeting the new runtime or using the new SDK or component.

Page URL

https://learn.microsoft.com/en-us/dotnet/core/compatibility/aspnet-core/6.0/actionresult-statuscode

Content source URL

https://github.com/dotnet/docs/blob/main/docs/core/compatibility/aspnet-core/6.0/actionresult-statuscode.md

Document Version Independent Id

64b65b92-b86a-1741-2a38-c1119b7d2ed1

Article author

@CamSoper

Metadata

• ID: 204588be-f452-4db7-db93-ed4ea5af6cd0
• Service: dotnet-fundamentals

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