[Ironpython-users] Passing an IronPython function to C#

Jeff Hardy jdhardy at gmail.com
Fri Mar 16 16:36:31 CET 2012

On Fri, Mar 16, 2012 at 4:24 AM, Doug Blank <doug.blank at gmail.com> wrote:
> This is looking more and more like a bug. I see from
> http://stackoverflow.com/questions/799987/how-to-pass-a-lambda-expression-to-a-c-sharp-constructor-from-an-ironpython-scri
> that it works for constructors (and have verified that it does), but I
> can't figure out any way to make it work with a static method. Why the
> difference?

Well, it could just be a bug :), and I haven't investigated it at all,
so this is speculation. However, in the first method (the params []
one) the callables are being passed directly, while in the second
they're being converted as part of a list -> List<> conversion.
IronPython's conversion code is, um, interesting -- Dino might
understand it all, but I don't know if anyone else does -- so it's
possible two different sets of conversions are being chosen. Now, this
*shouldn't* be the case, but it's my hypothesis.

> If it is a bug, is there a workaround? How can I pass any Python
> callable to a C# static method?

Try the conversion on the Python side, manually:

    f = System.Func[System.Object](test1)

- Jeff

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