Kent Johnson wrote:
Hi,
I am an IPy newbie, trying to run example 7.17 from IronPython in
Action. It includes the code
delegate = CallTarget0(something.form.Close)
something.form.Invoke(delegate)
were something.form is a Windows.Forms.Form object. The first line
above gives this error:
Traceback (most recent call last):
File "C:\Project\MangoTest\src\SmokeTest.py", line 43, in
C:\Project\MangoTest\src\SmokeTest.py
File "mscorlib", line unknown, in CreateDelegate
ValueError: Error binding to target method.
A while ago there were changes to CallTarget0 that made it incompatible
with .NET methods that have a void return signature. Dino told me he
would change it back so it would work again, but I guess that didn't
happen...
If I change the first line to
delegate = CallTarget0(lambda: something.form.Close())
it works fine.
This is the correct change to fix it.
Does the argument to CallTarget0() have to be a Python function? Or,
what is going on here?
No - but it is methods with a void return signature that are the issue.
Michael
--
http://www.ironpythoninaction.com/
http://www.voidspace.org.uk/blog
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