using System;

using System.Linq.Expressions;

public class Program

{

    public static void Main()

    {

        var inputParam = Expression.Parameter(typeof(string), "input");

        var parsedVar = Expression.Variable(typeof(int), "parsed");

        var tryParseCall = Expression.Call(typeof(int), "TryParse", null, inputParam, parsedVar);

        var writeLineCall = Expression.Call(typeof(Console), "WriteLine", null, Expression.Constant("Parsed: {0}"), Expression.Convert(parsedVar, typeof(object)));

        var lambda = Expression.Lambda<Action<string>>(Expression.Block(new[] { parsedVar }, tryParseCall, writeLineCall), inputParam);

        var compiled = lambda.Compile();

        compiled("3");

    }

}