本文介紹了捕獲的異常本身為空！的處理方法，對大家解決問題具有一定的參考價值，需要的朋友們下面隨著小編來一起學習吧！
問題描述
我有一個 ASP.NET 應用程序.一切都很好，但最近我得到了一些本身為空的異常:
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);
}
有時 ex 是 null 本身！
有什么想法嗎?
推薦答案
對于到此結(jié)束的任何人，我都找到了一個可行的實例(如果只能在調(diào)試器中檢測到的話).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);
}
解決方案是以不同的方式命名您的異常變量.
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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