Why green squiggly line creating Font variable?

Question

I am writing a .NET 6 Windows Forms application. See the project file below.

<!-- Replace ProjectName and SolutionName -->  
<Project Sdk="Microsoft.NET.Sdk">  
	<PropertyGroup>  
		<TargetFrameworks>net6.0-windows</TargetFrameworks>  
		<LangVersion>10</LangVersion>  
		<OutputType>winexe</OutputType>  
		<UseWindowsForms>true</UseWindowsForms>  
		<GenerateAssemblyInfo>false</GenerateAssemblyInfo>  
		<AssemblyName>MathHelper</AssemblyName>  
		<RootNamespace>MathHelper</RootNamespace>  
		<GenerateTargetFrameworkAttribute>false</GenerateTargetFrameworkAttribute>  
	</PropertyGroup>  
  <ItemGroup>  
    <Reference Include="MyLibrary">  
      <HintPath>..\..\MyLibrary\MyLibrary\obj\Debug\net6.0\MyLibrary.dll</HintPath>  
    </Reference>  
  </ItemGroup>  
</Project>  

In one of my methods is the following line:

Font selectionFont = new (FontFamily.GenericMonospace,8f);

In that line, 'new (FontFamily.GenericMonospace,8f);' is underlined with a green squiggly. Hovering over that line displays the following information:

I don't understand the information and despite the green squiggly, the application compiles and runs. What is wrong with that Font creation?

Answer 1

@Nicholas Piazza , Based on my research, It violates the Rule CA1416.

The article CA1416: Validate platform compatibility describes the cause as following:

Violations are reported if a platform-specific API is used in the context of a different platform or if the platform isn't verified (platform-neutral). Violations are also reported if an API that's not supported for the target platform of the project is used.

We could try the following method to Suppress violations.

Please use SupportedOSPlatformGuardAttribute or UnsupportedOSPlatformGuardAttribute in your code.

Like the following code:

[SupportedOSPlatform("linux")]  
public void LinuxOnlyApi() { }  
  
public void Caller()  
{  
#pragma warning disable CA1416  
    LinuxOnlyApi();  
#pragma warning restore CA1416  
}  

Hope this could help you.

Best Regards,
Jack

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