using System;

using System.Linq.Expressions;

using System.Collections;

using System.Collections.Generic;

using System.Reflection;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("****************** C# Equivalent Output **************************\n\n");

        Func<int, bool> myFunc = (x) => 

        {

            if (x == 5)

                return true;

            else

                return false;

        };

​

        Console.WriteLine(myFunc(5));

​

​

        Console.WriteLine("\n\n***************** Expression Tree Output **************************\n\n");

​

        LabelTarget returnTarget = Expression.Label(typeof(bool));

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

        Expression test = Expression.Equal(para, Expression.Constant(5));

        Expression iftrue = Expression.Return(returnTarget, Expression.Constant(true));

        Expression iffalse = Expression.Return(returnTarget, Expression.Constant(false));

​

        var ex = Expression.Block(

            Expression.IfThenElse(test, iftrue, iffalse),

            Expression.Label(returnTarget, Expression.Constant(false)));

​

        var compiled = Expression.Lambda<Func<int, bool>>(

            ex,

            new ParameterExpression[] { para }

        ).Compile();

​

        Console.WriteLine(compiled(5));     // prints "True"

​

​

    }

}