I'd extend that by saying it teaches you what OO was meant to be.. It also shows...

shawnz · on April 5, 2018

VS does have that functionality, although it was only added in VS 2015:

https://johnkoerner.com/csharp/the-c-interactive-window-in-v...

Previously there was the Immediate window but it is limited:

https://msdn.microsoft.com/en-us/library/f177hahy%28v=vs.110...

rjblackman · on April 5, 2018

unfortunately, it's not really the same as with proper message passing/late binding like in smalltalk.

shawnz · on April 5, 2018

You could use C# dynamic objects to achieve late binding.

ben-coman · on April 8, 2018

I'm not familiar with these. Are the properties and methods that dynamically add visible in the code editor?

It seems C# work by subclassing the DynamicObject class. What about dynamically extending all the other existing C# classes?

What if I subclassed a C# Queue as MyQueue and then while my days long simulation was running I wanted add an instance variable 'trackCount' to all existing MyQueue instances? In Pharo all you do is this...

Queue subclass: #MyQueue instanceVariableNames: ’trackCount’ classVariableNames: ’’ poolDictionaries: ’’ category: ’Example’

and program keeps running, this definition is updated in the editor.

rjblackman · on April 8, 2018

of course you could also build a whole smalltalk environment in C# also, but that really is not the point.

philippeback · on April 5, 2018

Try a become: in C#

ben-coman · on April 8, 2018

Gilad Bracha (co-author of the Java Language Specification) on "#become:" in Smalltalk (https://gbracha.blogspot.com.au/2009/07/miracle-of-become.ht...)

btw, see the section here on "Blub Paradox" (http://www.paulgraham.com/avg.html ) which means I'm not really competent to comment of C#'s dynamic objects.