Library to Parse a string as a formula, that works with Windows Phone 7

Question

Are there any .NET libraries out there that will parse a string as a formula?

ie; "if the user inputs "(2 +5) * 2", the library will be able to work out the calculation?

Edit:Preferably something that will work with Windows Phone 7 without too much fiddling would be nice!

possible duplicate of [Converting string expression to Integer Value using C#](http://stackoverflow.com/questions/2607798/converting-string-expression-to-integer-value-using-c) — Hans Passant, Mar 12 '11 at 02:03
Changed the title to reflect the specifics of the actual question. NCalc will not work with WP7. Not without a lot of fiddling anyway. — MrBliz, Mar 12 '11 at 12:20

score 13 · Answer 1 · edited May 15 '18 at 08:09

13

NCalc is a fairly nice library that will parse mathematical expressions in .NET code.

Edit - New location on Github.

edited May 15 '18 at 08:09

RooiWillie

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answered Mar 12 '11 at 00:08

Reed Copsey

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Lovely. That looks like just the ticket. Thanks. – MrBliz Mar 12 '11 at 00:13
Thanks for the library tip. I guess i should have specified in my post i need it to work with WP7. Edited now. – MrBliz Mar 12 '11 at 00:43
@Doozer1979: Heh, true - FYI - that's going to be a lot more difficult to find. A lot of the common techniques parsers use don't work in SL. – Reed Copsey Mar 12 '11 at 00:59
Unfortunately, NCalc does not work for Windows Phones. – Rishi Jasapara Jan 30 '14 at 11:04
@rishiJasapara When I posted this, WP wasn't a requirement or in the tags :) was added later, but this works great for most other options – Reed Copsey Jan 30 '14 at 18:24
I agree @ReedCopsey. Works for all other options. :) – Rishi Jasapara Feb 01 '14 at 07:18

score 5 · Accepted Answer · answered Mar 12 '11 at 00:38

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I posted source code for one that supports expressions, variables and functions.

You can see it at http://www.blackbeltcoder.com/Articles/algorithms/a-c-expression-evaluator.

answered Mar 12 '11 at 00:38

Jonathan Wood

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Thank you, I'm about to try it, but do you think there will be too much hassle using this with windows phone 7? – MrBliz Mar 12 '11 at 00:43
@Doozer1979: I haven't done any windows phone programming. But it's just straight C# so I'm not sure why it would be a problem. – Jonathan Wood Mar 12 '11 at 01:08
Works great, straight out of the box. Thanks – MrBliz Mar 12 '11 at 12:17

score 0 · Answer 3 · answered Mar 12 '11 at 01:59

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Due to possible complexities, I would recommend starting with a web API - WolframAlpha recently opened theirs and it works great. As a side effect, your application will have to be constantly connected to an active network.

answered Mar 12 '11 at 01:59

Den

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And for my particular mobile phone application, that's an absolute no-no. Thank you for the suggestion anyway. – MrBliz Mar 12 '11 at 12:18

Library to Parse a string as a formula, that works with Windows Phone 7

3 Answers3

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