Is there a string math evaluator in .NET?

Question

If I have a string with a valid math expression such as:

String s = \"1 + 2 * 7\";

Is there a built in library/function in .NET that will p

Answer 1

You can use Math-Expression-Evaluator library that I am author of. It supports simple expressions such as 2.5+5.9, 17.89-2.47+7.16, 5/2/2+1.5*3+4.58, expressions with parentheses (((9-6/2)*2-4)/2-6-1)/(2+24/(2+4)) and expressions with variables:

var a = 6;
var b = 4.32m;
var c = 24.15m;
var engine = new ExpressionEvaluator();
engine.Evaluate("(((9-a/2)*2-b)/2-a-1)/(2+c/(2+4))", new { a, b, c});

You can also pass parameters as named variables:

dynamic dynamicEngine = new ExpressionEvaluator();

var a = 6;
var b = 4.5m;
var c = 2.6m;

dynamicEngine.Evaluate("(c+b)*a", a: 6, b: 4.5, c: 2.6);

It supports .Net Standard 2.0 so can be used from .Net Core as well as .Net Full Framework projects and it doesn't have any external dependencies.