Summary

For

<TargetFramework />
<TargetFrameworks>net472;netstandard2.0</TargetFrameworks>

or

<TargetFramework></TargetFramework>
<TargetFrameworks>net472;netstandard2.0</TargetFrameworks>

We get

error BC0107: Project foo.csproj specifies 'TargetFrameworks' property 'net472;netstandard2.0' and 'TargetFramework' property '' at the same time. This will lead to 'TargetFrameworks' being ignored and build will behave as single-targeted.

Consider handling the case of $(TargetFramework) having empty value to be valid in this case.

Background and Motivation

A repo can have a default TF with several projects multi-targeting.

Sample issue or antipattern that the check should be flagging

<TargetFramework />
<TargetFrameworks>net472;netstandard2.0</TargetFrameworks>

or

<TargetFramework></TargetFramework>
<TargetFrameworks>net472;netstandard2.0</TargetFrameworks>

Should be valid usages

Sample output

No response