That's what I thought too... but.. In [82]: System.Nullable[System.DateTime]() --------------------------------------------------------------------------- TypeError Traceback (most recent call last) <ipython-input-82-97bddf8dec27> in <module>() ----> 1 System.Nullable[System.DateTime]()
TypeError: no constructor matches given arguments In any case that would give me an actual DateTime, not a Nullable<DateTime> with HasValue = false If only you HasValue wasn't read only ;) Anyway, now I understand what is going on I think this is enough of an edge case not to worry about - unless someone out there has a simple fix to pythondotnet to support it. John From: PythonDotNet [mailto:pythondotnet-bounces+jgill=tokiomillennium....@python.org] On Behalf Of Zane D. Purvis Sent: Wednesday, February 05, 2014 3:36 PM To: A list for users and developers of Python for .NET Subject: Re: [Python.NET] Passing in null as the value for a nullable type. Try System.Nullable[System.DateTime]() I haven't tested that, but I think that's what you need. On Wed, Feb 5, 2014 at 1:25 PM, John Gill <jg...@tokiomillennium.com<mailto:jg...@tokiomillennium.com>> wrote: Thanks. At least on my system there is no such thing as System.Null In c# at least, null is just a keyword in the language. From: PythonDotNet [mailto:pythondotnet-bounces+jgill<mailto:pythondotnet-bounces%2Bjgill>=tokiomillennium....@python.org<mailto:tokiomillennium....@python.org>] On Behalf Of Tribble, Brett Sent: Wednesday, February 05, 2014 1:45 PM To: A list for users and developers of Python for .NET Subject: Re: [Python.NET] Passing in null as the value for a nullable type. I believe you want to import System and pass System.Null. I can't remember if I've done this, but I think so. From: PythonDotNet [mailto:pythondotnet-bounces+btribble<mailto:pythondotnet-bounces%2Bbtribble>=ea....@python.org<mailto:ea....@python.org>] On Behalf Of John Gill Sent: Wednesday, February 05, 2014 8:47 AM To: pythondotnet@python.org<mailto:pythondotnet@python.org> Subject: [Python.NET] Passing in null as the value for a nullable type. I am sure there is a really simple answer to this one... but so far it is eluding me. I have a class something like this: public class Foo { ... public int process_date(DateTime? mydate) { ... } } I want to call this from python using pythondotnet. Calling it like this works fine: mydate = DateTime(0) Foo().process_date(mydate) But if I try to pass in a null as the date as follows: Foo().process_date(None) I get: TypeError: No method matches given arguments Hoping there is something really obvious I am missing here. John This communication and any attachments contain information which is confidential and may also be legally privileged. It is for the exclusive use of the intended recipient(s). If you are not the intended recipient(s) please note that any form of disclosure, distribution, copying, printing or use of this communication or the information in it or in any attachments is strictly prohibited and may be unlawful. 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