/**********************************************************************************************

* This fiddle is a demo of the library : CodingSeb.ExpressionEvaluator

* See : https://github.com/codingseb/ExpressionEvaluator

* For Others examples : https://dotnetfiddle.net/Packages/41132/CodingSeb_ExpressionEvaluator

**********************************************************************************************/

​

using System;

using System.Collections.Generic;

using CodingSeb.ExpressionEvaluator;

​

public class Person

{

    public string name;

    public string LastName { get; set; }

    public DateTime BirthDate { get; set; }

​

    public int GetTheAgeIfTodayIs(DateTime date)

    {

        var age = date.Year - BirthDate.Year;

        if (BirthDate.Date > date.AddYears(-age)) age--;

        return age;

    }

}

​

public class Program

{

    public static void Main()

    {

        ExpressionEvaluator evaluator = new ExpressionEvaluator();

        evaluator.Context = new Person()

        {

            name = "John",

            LastName = "Smith",

            BirthDate = new DateTime(1985, 09, 11)

        };

        List<string> expressions = new List<string>()

        {

            "name + \" \" + LastName",

            "GetTheAgeIfTodayIs(new DateTime(2016, 5, 14))",

            "GetTheAgeIfTodayIs(DateTime.Now)",

        };

        expressions.ForEach(expression => 

        {

            Console.WriteLine(expression);

            Console.WriteLine(evaluator.Evaluate(expression));

            Console.WriteLine(string.Empty);

        });

    }

}