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");

​

        int myInt;

        myInt = 12;

        myInt -= 5;

        Console.WriteLine(myInt);

​

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

​

        ParameterExpression myIntVariableExpr = Expression.Variable(typeof(int), "myInt");

​

        BlockExpression addAssignExpr = Expression.Block(

            new ParameterExpression[] { myIntVariableExpr },

            Expression.Assign(myIntVariableExpr, Expression.Constant(12)),

            Expression.SubtractAssign(

                myIntVariableExpr,

                Expression.Constant(5)

            )

        );

​

        Console.WriteLine(Expression.Lambda<Func<int>>(addAssignExpr).Compile()());

​

    }

​

}