NCalc - Mathematical Expressions Evaluator for .NET
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Project Description
NCalc is a mathematical expressions evaluator in .NET. NCalc can parse any expression and evaluate the result, including static or dynamic parameters and custom functions.
For additional information on the technique we used to create this framework please read this article: http://www.codeproject.com/KB/recipes/sota_expression_evaluator.aspx.
For documentation here is the table of content:Functionnalities
Simple expressions Expression e = new Expression("2 + 3 * 5"); Debug.Assert(17 == e.Evaluate());
Evaluates .NET data types Debug.Assert(123456 == new Expression("123456").Evaluate()); // integers Debug.Assert(new DateTime(2001, 01, 01) == new Expression("#01/01/2001#").Evaluate()); // date and times Debug.Assert(123.456 == new Expression("123.456").Evaluate()); // floating point numbers Debug.Assert(true == new Expression("true").Evaluate()); // booleans Debug.Assert("azerty" == new Expression("'azerty'").Evaluate()); // strings
Handles mathematical functional from System.Math Debug.Assert(0 == new Expression("Sin(0)").Evaluate()); Debug.Assert(2 == new Expression("Sqrt(4)").Evaluate()); Debug.Assert(0 == new Expression("Tan(0)").Evaluate());
Evaluates custom functions Expression e = new Expression("SecretOperation(3, 6)"); e.EvaluateFunction += delegate(string name, FunctionArgs args) { if (name == "SecretOperation") args.Result = (int)args.Parameters[0].Evaluate() + (int)args.Parameters[1].Evaluate(); }; Debug.Assert(9 == e.Evaluate());
Handles unicode characters Debug.Assert("経済協力開発機構" == new Expression("'経済協力開発機構'").Evaluate()); Debug.Assert("Hello" == new Expression(@"'/u0048/u0065/u006C/u006C/u006F'").Evaluate()); Debug.Assert("だ" == new Expression(@"'/u3060'").Evaluate()); Debug.Assert("/u0100" == new Expression(@"'/u0100'").Evaluate());
Define parameters, even dynamic or expressions Expression e = new Expression("Round(Pow([Pi], 2) + Pow([Pi2], 2) + [X], 2)"); e.Parameters["Pi2"] = new Expression("Pi * [Pi]"); e.Parameters["X"] = 10; e.EvaluateParameter += delegate(string name, ParameterArgs args) { if (name == "Pi") args.Result = 3.14; }; Debug.Assert(117.07 == e.Evaluate());
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