捕获的异常本身为空！

问题描述

我有一个 ASP.NET 应用程序.一切都很好，但最近我得到了一些本身为空的异常:

I have an ASP.NET applications. Everything was fine, but recently I get exceptions that are null themselves:

try
{
    // do something
}
catch (Exception ex)
{
    Logger.Log("Error while tried to do something. Error: " + ex.Message);
}

有时 ex 是 null 本身！

有什么想法吗?

推荐答案

对于到此结束的任何人，我都找到了一个可行的实例(如果只能在调试器中检测到的话).VS2013 更新 4.

For anyone ending up here, I've found an instance where this is possible (If only detectable in the debugger). VS2013 Update 4.

try
{
    // do something
}
catch (WebException ex) // <- both variables are named 'ex'
{
    Logger.Log("Error while tried to do something. Error: " + ex.Message);
}
catch (Exception ex) // <- this 'ex' is null
{
    Logger.Log("Error while tried to do something. Error: " + ex.Message);
}

解决方案是以不同的方式命名您的异常变量.

The solution is to name your exception variables differently.

try
{
    // do something
}
catch (WebException webEx) // <- all good in the hood
{
    Logger.Log("Error while tried to do something. Error: " + webEx.Message); // <-
}
catch (Exception ex) // <- this 'ex' correctly contains the exception
{
    Logger.Log("Error while tried to do something. Error: " + ex.Message);
}

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