C＃/ asp.net - 如何捕捉＆QUOT; System.Web.HttpException：请求超时＆QUOT;？

问题描述：

在我asp.net/c#项目，我现在用的iTextSharp的DLL来读取许多PDF文档中的文本，但有时我得到这个错误

In my asp.net/c# project I am using the iTextsharp dll to read the text from many pdf documents, but sometimes I get this error

System.Web.HttpException：请求超时

System.Web.HttpException: Request timed out.

不过，code，做它是：

But the code that does it is:

    public static bool does_pdf_have_keyword(string keyword, string pdf_src) 
    {
        try
        {
            PdfReader pdfReader = new PdfReader(pdf_src);
            string currentText;
            int count = pdfReader.NumberOfPages;
            for (int page = 1; page <= count; page++)
            {
                ITextExtractionStrategy strategy = new SimpleTextExtractionStrategy();
                currentText = PdfTextExtractor.GetTextFromPage(pdfReader, page, strategy);
                if (currentText.IndexOf(keyword, StringComparison.OrdinalIgnoreCase) != -1) return true;
            }
            pdfReader.Close();
            return false;
        }
        catch
        {
            return false;
        }
    }

那么，为什么页面进入未处理的异常时，它在尝试渔获物和渔获应该捕获一切？

So why does the page go into an unhandled exception when it's in a try catch and the catch is supposed to catch everything?

答

我想原因你的尝试没有赶上这个例外是，你得到的例外是无法从code本身抛出，而是从服务器中。

I think the reason your try is not catching this exception is that the exception you're getting is not thrown from your code per se, but from the server.

想想这种方式：

您$ C $ C运行良好，它只是需要很长的时间。

服务器监视请求正在多久，杀死该请求，并抛出一个异常。

所以你的code实际上并不抛出该异常。

So your code doesn't actually throw that exception.

现在，如果你想了解它，或者记录它，你可以用你的的Global.asax $的的Application_Error 方法C $ C>文件（假设你访问它，我不知道如何与SharePoint工作）。

Now, if you want to find out about it or log it, you can use the Application_Error method in your Global.asax file (assuming you have access to it, I'm not sure how that works with SharePoint).

例如，在我的web项目之一，我想记录所有的错误，甚至被没有抓到的网址。所以，我做的是这样的：

For example, in one of my web projects, I wanted to log all errors, even ones that weren't caught. So what I do is something like this:

protected void Application_Error(object sender, EventArgs e) {
    //Log ALL uncaught exceptions
    Exception exc = Server.GetLastError();
    if (exc is HttpUnhandledException) {
        exc = Context.Error.InnerException;
    }
    //Log error here
}

我不知道有多少，你可以用它做其他比记录它。我不知道在哪里在页面生命周期发生这种情况，所以我不知道你是否可以做类似获取当前的HTTP请求对象并重定向用户。

I'm not sure there's much you can do with it other than log it. I don't know where in the page life cycle this occurs so I'm not sure if you could do something like get the current HTTP request object and redirect the user.

希望这有助于。

C＃/ asp.net - 如何捕捉＆QUOT; System.Web.HttpException：请求超时＆QUOT;？

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