源程序如下:


using System;

namespace Exception_Test
{

class Class1
{
static void F()
{
try
{
G();
}
catch(Exception e)
{
Console.WriteLine("Exception in F:"+e.Message);
e=new Exception("F");
throw;
}

}
/*------------------------------------------------------------------------------------------------------*/
static void G()
{
throw new Exception("G");
}

/*------------------------------------------------------------------------------------------------------*/
[STAThread]
static void Main(string[] args)
{
try
{
F();
}
catch(Exception e)
{
Console.WriteLine("Exception in Main:"+e.Message);
}
Console.ReadLine();

}
}
}


这是书上的一个try-catch使用的例子,运行结果是:

Exception in F:G
Exception in Main:G

请问在处处理完G（）方法的异常后,已经改变了异常变量 new Exception("F"); 再次将异常 抛出.
结果应该是Exception in Main:F 才对啊，为什么输出还是G呢？

书上说这个再次抛出的异常与最初捕获的异常是同一个， 异常变量明明改变了啊

A throw statement with no expression can be used only in a catch block, in which case, that statement rethrows the exception that is currently being handled by that catch block.


方法F改一下, 就能在Main()中捕获F
static void F()
{
try
{
G();
}
catch(Exception e)
{
Console.WriteLine("Exception in F:"+e.Message);
e=new Exception("F");
throw e;
}

}

[此贴子已经被作者于2006-3-11 16:58:48编辑过]