NAnt msbuild latest .NET Framework versions problem fixed

   The problem with NAnt is that the latest supported version for .net framework is 4.5 (msbuild 13).
So, the following snippet:

    <msbuild project="D:\MyProject\MyProj.sln">
      <property name="nant.settings.currentframework" value="net-4.7.1">
      </property>
    </msbuild>

gives us the error

Target framework could not be changed. "net-4.7.1" is not a valid framework identifier.

The workaround is pretty simple - not to use <msbuild> at all. Instead of <msbuild> use <exec>:

    <exec
       program="C:\Program Files (x86)\Microsoft Visual Studio\2017\Enterprise\MSBuild\15.0\Bin\msbuild.exe" 
       commandline="D:\MyProject\MyProj.sln -t:rebuild" />

Set 'program' attribute to path to actual msbuild.exe file, 'commandline' - path to your solution.