// @nuget: Z.Expressions.Eval

​

using System;

using System.Collections.Generic;

using Z.Expressions;

public class Program

{

    public static void Main()

    {

        var context = new EvalContext();

        // ... context options ...

        string code = "Price * Quantity";

        var compiled = context.Compile<Func<OrderItem, decimal>>(code);

        List<OrderItem> list = new List<OrderItem>();

        for (int i = 1; i <= 5; i++)

        {

            list.Add(new OrderItem() {Price = i*0.25, Quantity = i });

        }

        decimal totals = 0;

        foreach(var item in list)

        {

            var value = compiled(item);

            Console.WriteLine(value);

            totals += value;

        }

        Console.WriteLine("");

        Console.WriteLine("Total : " + totals);

    }

    public class OrderItem 

    {

        public double Price {get;set;}  

        public int Quantity {get;set;}  

    }

}