How to pass nullable types to .Net

[juancentro]

I have a .Net method that has the following signature

public static void RequestHistory(string ric, DateTime? from, DateTime? to, int? n)

I can return nullable types from .Net methods and they are wrapped nicely.
However, if I try to pass NULL as a parameter, I get an error, because the NULL gets wrapped as a SymbolicExpression. Something similar happens if I pass a zero length array (e.g., integer(0)).
My last attemp was passing a NA of a correct mode (e.g, NA_integer_ but this isn't interpreted as null on the .NET side.

[jmp75]

Hi,

.NET not having native support for missing values (fair enough for a general purpose language), there is still quite a bit of work to do to emulate it, especially with respect to nullable types. Given my current work commitments I cannot look at this in the coming weeks, but a description of the use case(s) in posts in this issue is useful.

Apologies for the very delayed reply.