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");

​

        try

        {

            Console.WriteLine("Try block");

            throw new DivideByZeroException();

            Console.WriteLine("After throwing exception");

        }

        catch (DivideByZeroException)

        {

            Console.WriteLine("Catch block");

        }

        finally

        {

            Console.WriteLine("Finally block");

        }

​

​

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

​

​

        var tryBlock = Expression.Block(

            WriteLineExpression("Try block"),

            Expression.Throw(Expression.Constant(new DivideByZeroException())),

            WriteLineExpression("After throwing exception")

        );

​

        var catchBlock = Expression.Catch(

            typeof(DivideByZeroException),

            WriteLineExpression("Catch block")

        );

​

        var finallyBlock = WriteLineExpression("Finally block");

​

        TryExpression tryFinallyExpr = Expression.TryCatchFinally(tryBlock, finallyBlock, catchBlock);

​

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

    }

​

    public static Expression WriteLineExpression(string s)

    {

        return Expression.Call(null,

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

           Expression.Constant(s));

    }

}