// @nuget: Z.Expressions.Eval

​

using System;

using System.Collections.Generic;

using System.Linq;

using Z.Expressions;

public class Program

{

    public static void Main()

    {

        // "User Input"

        var code = "X + Y > Z";

        List<Tuple<string, string>> parameterTypeAndNames = new List<Tuple<string, string>>();

        parameterTypeAndNames.Add(new Tuple<string, string>("int", "X"));

        parameterTypeAndNames.Add(new Tuple<string, string>("int", "Y"));

        parameterTypeAndNames.Add(new Tuple<string, string>("int", "Z"));

        // Build the code to execute the user code

        string parameterTypes = string.Join(",", parameterTypeAndNames.Select(x => x.Item1));

        string parameterNames = string.Join(",", parameterTypeAndNames.Select(x => "\"" + x.Item2 + "\""));

        var codeToCompile = string.Format("context.Compile<Func<{0}, bool>>(code, {1})", parameterTypes, parameterNames);

        var context = new EvalContext();

        Console.WriteLine(codeToCompile);

        var compiled = context.Execute(codeToCompile, new { context, code });

        // Use the compiled code

        var dynamicCompiled = (dynamic)compiled;

        Console.WriteLine(dynamicCompiled(1, 2, 3));

        Console.WriteLine(dynamicCompiled(1, 4, 3));

    }

}