【发布时间】:2010-09-10 10:48:27
【问题描述】:
假设ex 是您要捕获的异常,只说throw; 和throw ex; 有区别吗?
【问题讨论】:
假设ex 是您要捕获的异常,只说throw; 和throw ex; 有区别吗?
【问题讨论】:
throw ex; 将清除您的堆栈跟踪。除非您要清除堆栈跟踪,否则不要这样做。只需使用throw;
【讨论】:
这里有一个简单的代码 sn-p 可以帮助说明差异。不同之处在于 throw ex 将重置堆栈跟踪,就好像“throw ex;”行是异常的来源一样。
代码:
using System;
namespace StackOverflowMess
{
class Program
{
static void TestMethod()
{
throw new NotImplementedException();
}
static void Main(string[] args)
{
try
{
//example showing the output of throw ex
try
{
TestMethod();
}
catch (Exception ex)
{
throw ex;
}
}
catch (Exception ex)
{
Console.WriteLine(ex.ToString());
}
Console.WriteLine();
Console.WriteLine();
try
{
//example showing the output of throw
try
{
TestMethod();
}
catch (Exception ex)
{
throw;
}
}
catch (Exception ex)
{
Console.WriteLine(ex.ToString());
}
Console.ReadLine();
}
}
}
输出(注意不同的堆栈跟踪):
System.NotImplementedException: The method or operation is not implemented.at StackOverflowMess.Program.Main(String[] args) in Program.cs:line 23
System.NotImplementedException: The method or operation is not implemented.at StackOverflowMess.Program.TestMethod() in Program.cs:line 9at StackOverflowMess.Program.Main(String[] args) in Program.cs:line 43
【讨论】:
你有两个选择扔;或将原始异常作为新异常的内部异常抛出。看你需要什么。
【讨论】: