异常

using System;

namespace ConsoleApplication2
{
    /**//// <summary>
    /// Class1 的摘要说明。
    /// </summary>
    class Class1
    {
        static string[] eTypes ={ "none", "simple", "index", "nested index" };
        [STAThread]
        static void Main(string[] args)
        {
            foreach (string eType in eTypes)
            {
                try
                {
                    Console.WriteLine("Main() try block reached.");
                    Console.WriteLine("ThrowException(\"{0}\") called.", eType);
                    ThrowException(eType);
                    Console.WriteLine("Main() try block continues.");
                }
                catch (System.IndexOutOfRangeException e)
                {
                    Console.WriteLine("Main() System.IndexOutOfRangeException catch " +
                     " block reched.Message:\n\"{0}\"", e.Message);
                }
                catch
                {
                    Console.WriteLine("Main() general catch block reached.");
                }
                finally
                {
                    Console.WriteLine("Main() finally block reached.");
                }
                Console.WriteLine();
            }
        }

        static void ThrowException(string exceptionType)
        {
            Console.Write("ThrowException(\"{0}\")reached.", exceptionType);
            switch (exceptionType)
            {
                case "none":
                    Console.WriteLine("Not throwing an exception.");
                    break;
                case "simple":
                    Console.WriteLine("Throwing System.Exception.");
                    throw (new System.Exception());
                    break;
                case "index":
                    Console.WriteLine("Throwing System.IndexOutOfRangeexception.");
                    eTypes[4] = "error";
                    break;
                case "nested index":
                    try
                    {
                        Console.WriteLine("ThrowException(\"nested index\"):" + "try block reached.");
                        Console.WriteLine("ThrowException(\"index\")called.");
                        ThrowException("index");
                    }
                    catch
                    {
                        Console.WriteLine("ThrowException(\"nested index\")general" + " catch block reached.");
                    }
                    finally
                    {
                        Console.WriteLine("ThrowException(\"nested index\")finally" + "block reached.");
                    }
                    break;
            }
        }
    }
}


//此异常的处理说明,异常产生后,如果在当前未做Try处理,则会返到上一级,如果还未做,则返回上一级的上一级.以此类推.如果被任意一级Catch到,则上一级不会再得到.