using System;

using System.Linq.Expressions;

using System.Collections;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

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

        int num = 60;

​

        if(num > 10)

        {

            Console.WriteLine("num is greater than 10");

        }

        else

        {

            Console.WriteLine("num is less than or equan to 10");

        }

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

        var testCondition = Expression.Constant(num > 10);

        var ifTrueBlock = WriteLineExpression("num is greater than 10");

        var ifFalseBlock = WriteLineExpression("num is less than or equal to 10");

​

        var ifThenElseExpr = Expression.IfThenElse(

            testCondition,

            ifTrueBlock,

            ifFalseBlock);

​

        Expression.Lambda<Action>(ifThenElseExpr).Compile()();

    }

    public static Expression WriteLineExpression(string s)

    {

        return Expression.Call(null,

            typeof(Console).GetMethod("WriteLine", new Type[] { typeof(String) }),

            Expression.Constant(s));

    }

​

}