CA1859: Use concrete types when possible for improved performance

[MrAntix]

Type of issue

Typo

Description

Hello

I get this a lot in my unit tests when I am testing a service that explicitly implements an interface.
In this case, I must return the interface or the method I am testing cannot be called

Can you improve the checks to stop this case?
I know I can supress it

Many thanks

Page URL

https://learn.microsoft.com/en-gb/dotnet/fundamentals/code-analysis/quality-rules/ca1859

Content source URL

https://github.com/dotnet/docs/blob/main/docs/fundamentals/code-analysis/quality-rules/ca1859.md

Document Version Independent Id

c8f7f102-2398-9acc-71b8-b0f848a05b92

Article author

@gewarren

Metadata

• ID: 0e2d460f-c6f3-1e26-d932-b7e69746e513
• Service: dotnet-fundamentals

[gewarren]

@jaredpar I think this needs to be transferred to the roslyn-analyzers repo, but I don't have permissions. Can you transfer it?