// @nuget: Z.Expressions.Eval

​

using System;

using System.Collections.Generic;

using System.Dynamic;

using Z.Expressions;

public class Program

{

    public static void Main()

    {

        dynamic employee = new ExpandoObject();

        ((IDictionary<string, object>)employee).Add("Name1", "Euvic");

        ((IDictionary<string, object>)employee).Add("Name2", null);

        ((IDictionary<string, object>)employee).Add("Value", 0);

        Console.WriteLine($"Parameter = {employee.Name1 ?? "null"}");

        var val1_a = Eval.Execute("Name1 == null", employee);

        Console.WriteLine($"Parameter == null - return value [" + val1_a + "]");

        var val1_b = Eval.Execute("Name1 == \"Euvic\"", employee);

        Console.WriteLine($"Parameter == \"Euvic\" - return value [" + val1_b + "]");

        Console.WriteLine();

        Console.WriteLine($"Parameter = {employee.Name2 ?? "null"}");

        var val2_a = Eval.Execute("Name2 == null", employee);

        Console.WriteLine($"Parameter == null - return value [" + val2_a + "]");

        var val2_b = Eval.Execute("Name2 == \"Euvic\"", employee);

        Console.WriteLine($"Parameter == \"Euvic\" - return value [" + val2_b + "]");

        Console.WriteLine();

        Console.WriteLine($"Parameter = 0");

        var val3_a = Eval.Execute("1 == 1 || 25/{Value} == 0", employee);

        Console.WriteLine($"1 == 1 || 25/Parameter == 0 - return value [" + val3_a + "]");

    }

}