@whaozl we are thinking about deprecating RunString, see the thread here:

#401

Any reason why RunSimpleString is not fine?

I want to return values for the command.

we recently added that feature thanks to @yagweb on #389. You can try those commands. The tests he added have examples on how to use them.

but, in the release pythonnet 2.2.2, I don't find the PythonEngine.Eval. and, will you release a new version?

#355 is where we'll probably be discussing when the next release will be. There's still a couple open items left before we can release though.

If you just want to get a copy of the latest whl without having to build them, you can get them from AppVeyor

Click on your version, then click on artifacts and download the wheel.
You can then install it with pip install --no-index --find-links=.\dist\ pythonnet

Thank you very much!