自定義異常

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

/*
 * ***************************************
 * 定義了一個循環，定義了一個自定義異常類
 * 輸出（如果輸入1）：
 * 1
 * 內finally
 * 第一級錯誤:自定義錯誤1     第二級錯誤：再一次出錯
 * 外finally
 * ***************************************
 */
namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            while (true)
            {
                string str = Console.ReadLine();
                Console.WriteLine(str);
                try
                {
                    try
                    {
                        if (str == "1")
                        {
                            throw new CustomException();
                        }
                    }
                    catch (CustomException ex)
                    {
                        throw new CustomException("再一次出錯",ex);
                    }
                    finally
                    {
                        Console.WriteLine("內finally");
                    }
                }
                catch (CustomException ex)
                {
                    Console.WriteLine("第一級錯誤:" + ex.InnerException.Message + "\t第二級錯誤：" + ex.Message);
                }
                catch (Exception ex)
                {
                    Console.WriteLine(ex.Message);
                }
                finally
                {
                    Console.WriteLine("外finally");
                }
            }
        }
    }

    /// <summary>
    /// 自定義異常類
    /// </summary>
    class CustomException : ApplicationException
    {
        public CustomException(string msg = "自定義錯誤1")
            : base(msg)
        {
        }
        public CustomException(string msg, Exception innerException)
            : base(msg, innerException)
        {
        }
    }
}