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 cValue = 0;

        while (true)

        {

            cValue++;

            if (cValue < 5)

            {

                if (cValue == 3)

                {

                    continue;

                }

                else

                {

                    Console.WriteLine(cValue);

                }

            }

            else

            {

                break;

            }

        }

​

​

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

        LabelTarget breakLabel = Expression.Label();

​

        // A label that is used by the Continue statement and the loop it refers to.

        LabelTarget continueLabel = Expression.Label();

​

        // This expression represents a Continue statement.

        Expression continueExpr = Expression.Continue(continueLabel);

​

        // A variable that triggers the exit from the loop.

        ParameterExpression count = Expression.Parameter(typeof(int));

​

        var ifTrueBlock = continueExpr;

​

        var ifFalseBlock = Expression.Call(

            null,

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

            count

            );

​

        var nestedIfThenElseExpr = Expression.IfThenElse(

            Expression.Equal(count, Expression.Constant(3)),

            ifTrueBlock,

            ifFalseBlock

            );

​

        var ifThenElseExpr = Expression.IfThenElse(

            Expression.LessThan(count, Expression.Constant(5)),

            nestedIfThenElseExpr,

            Expression.Break(breakLabel, count)

        );

​

        var block = Expression.Block(Expression.PostIncrementAssign(count), ifThenElseExpr);

        // A loop statement.

        Expression loopExpr = Expression.Loop(block,

            breakLabel,

            continueLabel

        );

​

        // The following statement first creates an expression tree,

        // then compiles it, and then runs it.

        // Without the Continue statement, the loop would go on forever.

        Expression.Lambda<Action<int>>(loopExpr, count).Compile()(0);

​

    }

}

​

​