在 ASP.NET C# 中抛出异常
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原文地址: http://stackoverflow.com/questions/88490/
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Throwing exceptions in ASP.NET C#
提问by Chris Westbrook
Is there a difference between just saying throw;and throw ex;assuming exis the exception you're catching?
只是说throw;和throw ex;假设ex是你捕捉到的例外有区别吗？
采纳答案by GEOCHET
throw ex;will erase your stacktrace. Don't do this unless you mean to clear the stacktrace. Just use throw;
throw ex;将删除您的堆栈跟踪。除非您想清除堆栈跟踪，否则不要这样做。只需使用throw;
回答by GEOCHET
You have two options throw; or throw the orginal exceptional as an innerexception of a new exception. Depending on what you need.
你有两个选择投掷；或将原始异常作为新异常的内部异常抛出。取决于你需要什么。
回答by Eric Schoonover
Here is a simple code snippet that will help illustrate the difference. The difference being that throw ex will reset the stack trace as if the line "throw ex;" were the source of the exception.
这是一个简单的代码片段，可以帮助说明差异。不同之处在于 throw ex 将重置堆栈跟踪，就好像行“ throw ex;”是异常的来源一样。
Code:
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();
}
}
}
Output (notice the different stack trace):
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
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
