Math-Expression-Evaluator

Math Expression Evaluator

Sponsors

Entity Framework Extensions and Dapper Plus are major sponsors and are proud to contribute to the development of Math Expression Evaluator.

Usage

Math Expression Evaluator is a library for evaluating simple mathematical expressions. 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;
Assert.That(engine.Evaluate("(((9-a/2)*2-b)/2-a-1)/(2+c/(2+4))", new { a, b, c}), 
            Is.EqualTo((((9 - a / 2) * 2 - b) / 2 - a - 1) / (2 + c / (2 + 4))));

It is also possible to specify variables by using named arguments like this:

dynamic dynamicEngine = new ExpressionEvaluator();

var a = 6;
var b = 4.5m;
var c = 2.6m;
Assert.That(dynamicEngine.Evaluate("(c+b)*a", a: 6, b: 4.5, c: 2.6),
            Is.EqualTo((c + b) * a));

Installation

dotnet add package Math-Expression-Evaluator

User Feedback

From https://stackoverflow.com/questions/50722680/methods-for-dynamically-creating-an-array-in-c-sharp

DavidG

Can't decide if this library is evil, genius or evil genius...

xanatos

That library is using high level magic... Very high level :-)

The class is dynamic and is handling in a dynamic way the use of the method... fascinating