自定义异常

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

/*
 * ***************************************
 * 定义了一个循环，定义了一个自定义异常类
 * 输出（如果输入1）：
 * 1
 * 内finally
 * 第一级错误:自定义错误1     第二级错误：再一次出错
 * 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("再一次出错",ex);
                    }
                    finally
                    {
                        Console.WriteLine("内finally");
                    }
                }
                catch (CustomException ex)
                {
                    Console.WriteLine("第一级错误:" + ex.InnerException.Message + "\t第二级错误：" + ex.Message);
                }
                catch (Exception ex)
                {
                    Console.WriteLine(ex.Message);
                }
                finally
                {
                    Console.WriteLine("外finally");
                }
            }
        }
    }

    /// <summary>
    /// 自定义异常类
    /// </summary>
    class CustomException : ApplicationException
    {
        public CustomException(string msg = "自定义错误1")
            : base(msg)
        {
        }
        public CustomException(string msg, Exception innerException)
            : base(msg, innerException)
        {
        }
    }
}