using System;

[assembly: Trace.QuickTrace(AttributeTargetAssemblies = "PostSharpIntro", AttributeTargetTypes = "PostSharpIntro.*")]

namespace PostSharpIntro
{
    class Program
    {
        static void Main(string[] args)
        {
            System.Diagnostics.Trace.Listeners.Add(new System.Diagnostics.TextWriterTraceListener(Console.Out));

            try
            {
                var calculator = new Calculator();
                int a = 7, b = 5, result;

                string message = "Welcome to the PostSharpIntro project";
                Console.WriteLine(message);

                result = calculator.Add(a, b);
                message = string.Format("{0} add {1} equals {2}", a, b, result);
                Console.WriteLine(message);

                result = calculator.Subtract(a, b);
                message = string.Format("{0} subtract {1} equals {2}", a, b, result);
                Console.WriteLine(message);

                calculator.RunUnstableCode();
            }
            catch (Exception e)
            {
                Console.WriteLine(e.Message);
            }
            finally
            {
                Console.WriteLine("Press any yet to exit...");
                Console.ReadKey();
            }
        }

        public class Calculator
        {
            internal int Add(int a, int b)
            {
                return a + b;
            }

            internal int Subtract(int a, int b)
            {
                return a - b;
            }

            internal void RunUnstableCode()
            {
                throw new Exception("Houston, we have a problem!");
            }
        }
    }
}