using System;

using System.Linq.Expressions;

​

​

public class Program

{

    public static void Main()

    {

        //Expression 1

        Expression<Func<int,bool>> compare = num => num < 5;

        Console.WriteLine(compare.Compile()(2));

        //Expression 2

        var prm = Expression.Parameter(typeof(string), "str");

        var toUpper = typeof(string).GetMethod("ToUpper", Type.EmptyTypes);

        var body = Expression.Call(prm, toUpper);

        var lambda = Expression.Lambda(body, prm);

        Console.WriteLine(lambda.Compile().DynamicInvoke("camilo"));

    }

}