I have some C# code that pulls down a remote website using the HttpWebRequest class. I'm handling errors with a try/catch, but some errors (like Webrequest and IOException) don't seem to be getting "caught" with the way I have it setup:
我有一些C#代码使用HttpWebRequest类来下载远程网站。我正在使用try / catch处理错误,但是有些错误(比如Webrequest和IOException)似乎没有被我设置的方式“抓住”:
try
{
StartScrap("http://www.domain.com");
}
catch (Exception ex)
{
LogError(ex.ToString();
}
private void StartScrap(string url)
{
HttpWebRequest webRequest = (HttpWebRequest)WebRequest.Create(url);
HttpWebResponse response = (HttpWebResponse)webRequest.GetResponse();
if (response.StatusCode == HttpStatusCode.OK)
{
Stream responseStream = response.GetResponseStream();
string responseText = String.Empty;
using (StreamReader readerStream = new StreamReader(responseStream, System.Text.Encoding.UTF8))
{
responseText = readerStream.ReadToEnd(); <-- I will sometimes get a Webexception error here that won't get caught above and stops the code
}
}
}
Update: There is more to the code, so maybe it is something outside of the code I posted? I am basically using this code in a Windows Application on a form that has a NotifyIcon. I'm using the Timer class to run the code at a certain timer interval. This is how I have it setup:
更新:代码还有更多,所以它可能是我发布的代码之外的东西吗?我基本上在具有NotifyIcon的表单上的Windows应用程序中使用此代码。我正在使用Timer类以特定的定时器间隔运行代码。这就是我设置它的方式:
public TrayIcon()
{
InitializeComponent();
}
private void TrayIcon_Load(object sender, EventArgs e)
{
try
{
StartScrap("http://www.domain.com");
}
catch (Exception ex)
{
LogError(ex.ToString());
}
finally
{
StartTimer();
}
}
private void StartTimer()
{
Timer Clock = new Timer();
Clock.Interval = 600000;
Clock.Start();
Clock.Tick += new EventHandler(TrayIcon_Load);
}
4 个解决方案
#1
3
What exactly do you mean by "stops the code"? Are you running in a debugger by any chance? My guess is that if you run outside the debugger - or just hit "run" again in the debugger - you'll get into the catch block with no problems. Alternatively, go into the debugger settings and change at which point the debugger steps in.
“停止代码”究竟是什么意思?您是否有机会在调试器中运行?我的猜测是,如果你在调试器之外运行 - 或者只是在调试器中再次点击“run” - 你将进入catch块而没有任何问题。或者,进入调试器设置并更改调试器进入的位置。
Of course, if this isn't happening in the debugger, we just need more information about exactly what you're seeing.
当然,如果在调试器中没有发生这种情况,我们只需要更多关于您所看到的内容的信息。
#2
2
Could it be that LogError is throwing an exception?
可能是LogError抛出异常吗?
#3
#4
0
Nevermind, I found out I was calling the wrong function my Timer class and it was bypassing the event handler.
没关系,我发现我调用了错误的函数我的Timer类,它绕过了事件处理程序。
#1
3
What exactly do you mean by "stops the code"? Are you running in a debugger by any chance? My guess is that if you run outside the debugger - or just hit "run" again in the debugger - you'll get into the catch block with no problems. Alternatively, go into the debugger settings and change at which point the debugger steps in.
“停止代码”究竟是什么意思?您是否有机会在调试器中运行?我的猜测是,如果你在调试器之外运行 - 或者只是在调试器中再次点击“run” - 你将进入catch块而没有任何问题。或者,进入调试器设置并更改调试器进入的位置。
Of course, if this isn't happening in the debugger, we just need more information about exactly what you're seeing.
当然,如果在调试器中没有发生这种情况,我们只需要更多关于您所看到的内容的信息。
#2
2
Could it be that LogError is throwing an exception?
可能是LogError抛出异常吗?
#3
0
Frankly speaking I am not sure what exactly happening but I will suggest you to go with ELMAH.(Error Logging Modules and Handlers)
坦率地说,我不确定到底发生了什么,但我建议你选择ELMAH。(错误记录模块和处理程序)
Here is a step by step How to for ELMAH.
这是一步一步如何为ELMAH。
#4
0
Nevermind, I found out I was calling the wrong function my Timer class and it was bypassing the event handler.
没关系,我发现我调用了错误的函数我的Timer类,它绕过了事件处理程序。