[feature] Support for out parameters

[olegbevz]

Hello, I need to call IDictionary.TryGetValue method in my expression, as I understand out parameters are not supported now.
I've tried to execute following code in TryWindow application:

var dictionary = new Dictionary<string, object>();
dictionary.Add("x", 5);
object number = null;
if (dictionary.TryGetValue("x", out number))
	return number;
return 0;

and have got following message:

Variable [out] unknown in expression : [out number]

Mb I did something wrong?
Are there any plans to support out parameters feature?

[lofcz]

out along with several other missing keywords are on todo here: https://github.com/codingseb/ExpressionEvaluator/wiki/ExpressionEvaluator-Todo-List

+1 for this, supporting out would be nice.

[codingseb]

Hello @olegbevz.
Thanks for this issue and your interest for ExpressionEvaluator (EE).
Yes as @lofcz said it is on my todo list. So if it a request now, I will put it in my priority list for EE.
Just take note that I have a bit less time for EE these days for personal reasons.
But I will come back to this as soon as I can and will look how to implement out and maybe ref keywords.

[lofcz]

Thanks @codingseb, hope things are (will be) fine! I think that priority of missing keywords would be out > ref > params > in. Note this is not taking async into account.
I'm also planning to send another 50$ this month as a small token of my gratitude for your work.

[codingseb]

@lofcz Thanks, you are awesome.
Things are fine, I just have a bit more stuff to manage than as usual.
I think for a couple of days or weeks.
I will come back as soon as I can.

[codingseb]

I published version 1.4.20.0 that add support for out, ref, in keywords and for calling methods with params parameter.

The implementation is a bit more permissive than in pure C# and also required to modify a bit the way the library search the right override of a method and how it manage parameters to call it. I made a few tests to ensure that the most cases work but if you find some bugs related to this don't hesitate to open new issues.

Thanks guys
I am glad that this will allow a bunch of new stuff with EE.

[lofcz]

Congratulations, great job @codingseb !