// Dynamic LINQ

// Doc: https://linq-dynamic.net/parse-lambda

​

// @nuget: System.Linq.Dynamic.Core

​

using System;

using System.Linq.Expressions;

using System.Linq.Dynamic.Core;

using System.Linq.Dynamic.Core.Parser;

​

public class Program

{

    public static void Main()

    {

        ParameterExpression x = Expression.Parameter(typeof(int), "x");

        ParameterExpression y = Expression.Parameter(typeof(int), "y");

​

        var symbols = new[] { x, y };

​

        Expression body = new ExpressionParser(symbols, "(x + y) * 2", symbols, new ParsingConfig()).Parse(typeof(int));

​

        LambdaExpression e = Expression.Lambda(body, new ParameterExpression[] { x, y });

​

​

        var c = e.Compile();

        var result = c.DynamicInvoke(1, 2);

​

        Console.WriteLine(result);

    }

}