gistfile1.cs

return connectorType.
  GetCustomAttribute<ConfigurationNameAttribute>(inherit: true).
  ToMaybe().
  Select(x => x.Name).
  Return(@default: connectorType.Name);

gistfile2.cs

var attr = connectorType.
    GetCustomAttribute<ConfigurationNameAttribute>(inherit: true);
if (attr != null)
    return attr.Name;
return connectorType.Name;