.NET 6 代码分析器 CodeAnalysisTreatWarningsAsErrors 中断

Question

We are trying to enable to .NET 6 Code Analyzer on our .NET 472 projects. In most projects we have WarningsAsErrors set to true. We dont want to CA warnings to report as an error, so we added CodeAnalysisTreatWarningsAsErrors as false.

When doing so, all the CA warnings are no longer reported

We now use the following settings

  <PropertyGroup> 
    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
    <EnableNETAnalyzers>true</EnableNETAnalyzers>
    <AnalysisLevel>latest-recommended</AnalysisLevel>
    <CodeAnalysisTreatWarningsAsErrors>false</CodeAnalysisTreatWarningsAsErrors>
    <WarningsNotAsErrors>$(WarningsNotAsErrors);CS8073;CS8882;CS8887;CS8848</WarningsNotAsErrors>
  </PropertyGroup>

Without the settings, we have 0 warnings. With these settings, only a few additional CS warnings are triggered, the ones we had to add in the WarningsNotAsErrors

If i remove the CodeAnalysisTreatWarningsAsErrors property and set TreatWarningsAsErrors to false, i get 1700 CA warnings in our code base. I would expect to see these 1700 warnings with above settings as well. When i set CodeAnalysisTreatWarningsAsErrors to true, i get 1700 errors.

I am using this in my global.json file

{
    "sdk": {
        "version": "6.0.300",
        "rollForward": "latestFeature"
    }
}

and have sdk's 6.0.300 and 6.0.401 installed, along with VS 17.2

Why is CodeAnalysisTreatWarningsAsErrors breaking our code analysis scan? Any advice would be helpful.

Edit: adding images

VS shows it wants to treat them as warning:

Answer 1

I set TreatWarningsAsErrors and CodeAnalysisTreatWarningsAsErrors to true or false for Combinatorial testing. Below are several test results.

Situation 1

<TreatWarningsAsErrors>true</TreatWarningsAsErrors>

This returns all CS errors.

Situation 2

<TreatWarningsAsErrors>false </TreatWarningsAsErrors>

This returns all CS warnings.

Situation 3

<TreatWarningsAsErrors>true</TreatWarningsAsErrors>
<EnableNETAnalyzers>true</EnableNETAnalyzers>
<AnalysisLevel>latest-recommended</AnalysisLevel>

Situation 4

<TreatWarningsAsErrors>true</TreatWarningsAsErrors>
<EnableNETAnalyzers>true</EnableNETAnalyzers>
<AnalysisLevel>latest-recommended</AnalysisLevel>
<CodeAnalysisTreatWarningsAsErrors>true</CodeAnalysisTreatWarningsAsErrors>

Both 3 and 4 returns CS and CA errors.

Situation 5

<TreatWarningsAsErrors>true</TreatWarningsAsErrors>
<EnableNETAnalyzers>true</EnableNETAnalyzers>
<AnalysisLevel>latest-recommended</AnalysisLevel>
<CodeAnalysisTreatWarningsAsErrors>false </CodeAnalysisTreatWarningsAsErrors>

This returns CS errors and CA warnings.

Situation 6

<TreatWarningsAsErrors>false </TreatWarningsAsErrors>
<EnableNETAnalyzers>true</EnableNETAnalyzers>
<AnalysisLevel>latest-recommended</AnalysisLevel>
<CodeAnalysisTreatWarningsAsErrors>false</CodeAnalysisTreatWarningsAsErrors> (Or it can be removed)

This returns CA and CS warnings.

From your description,

I would expect to see these 1700 warnings with above settings as well.

My understanding is that if you want to see warnings, you can follow situation 6. I'm afraid you can't see these 1700 warnings with above settings as well.

<TreatWarningsAsErrors>true</TreatWarningsAsErrors> <CodeAnalysisTreatWarningsAsErrors>false</CodeAnalysisTreatWarningsAsErrors>)

But I'm not sure exactly what your question is from your last paragraph. If there is any misunderstanding, please feel free to let me know.