title: Can someone confirm .NET Core can't run a legacy .NET class library that uses System.Configuration.ConfigurationManager
body: <p>I have some legacy (.NET 4.6) code that uses ConfigurationManager to access AppSettings. I'm trying to use this class library in an Azure Function v3 and it fails with error:</p>
  
  <p><code>Could not load file or assembly 'System.Configuration.ConfigurationManager, Version=4.0.3.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. The system cannot find the file specified.</code></p>
  
  <p>Before I spend the time to remove the dependency on System.Configuration it would be great to get confirmation (documented) that this specific scenario is not supported -- I can't find it anywhere.</p>
  
  <p>Am I missing something simple for the interop or is it unsupported?</p>