如何释放“繁忙”的C＃Web浏览器

Question

I am using c# and webbrowser to scrape a web page.

Sometimes, I will run into a "Message from webpage" popup error.

I use:

hwnd = FindWindow("#32770", "Message from webpage");
hwnd = FindWindowEx(hwnd, IntPtr.Zero, "Button", "OK");
SendMessage(hwnd, 0xf5, IntPtr.Zero, IntPtr.Zero);

To press ok. However when I try to navigate again, I'll get an error that the webbrowser is still busy. How can I force it to become free again?

The only workaround I have found is to try to "restart" the browser. I am doing the following:

ie.Dispose();
ie = new System.Windows.Forms.WebBrowser();

This seems to work, but as soon as I navigate, I get a "A script on this page is causing Internet Explorer to run slowly" popup. I can still continue navigating but I notice that overtime I have a rather large memory leak. I'm not sure if it is from the way I have "restarting" the browser or from leaving the popup up.

If you have a way to "free" the browser or if you can confirm the correct way to restart a browser, that would be greatly appreciated.

Answer 1

It certainly seems that you are using Dispose() correctly to destroy (elegantly) the WebBrowser class. And creating it with new is fine also. (Just take care of which thread you use - as per link below)

According to here , you could try a Stop() and Refresh() sequence, although this may not prevent the memory leak.

It's hard to tell from your scant code if the leak is due to the Browser class, your code or the webpages themselves...(Most likely the web pages, considering the amount of buggy webpages)

But if speed is not important, disposing and renewing the WebBrowser class should not be an issue