WebBrowser.Navigate(...) throws COMException

exception internet-explorer browser comexception
kh34 picture kh34 · Feb 9, 2010 · Viewed 10k times · Source

I'm developing an Internet Explorer command button that will open a specific web page once clicked. Here's a snippet of code (IEApp is a reference to an instance of IE.WebBrowser):

IEApp.Navigate(sURL, ref one, ref two, ref three, ref four);

The above line throws the following COMException:

Exception Source:      Interop.SHDocVw
Exception Type:        System.Runtime.InteropServices.COMException
Exception Message:     The requested resource is in use. (Exception from HRESULT: 0x800700AA)
Exception Target Site: Navigate

This wasn't a problem on IE6 or IE7. Any ideas on what's going wrong? I'm using AddInExpress for creating the command button.

Cheers! Christian

Answer

Sheng Jiang 蒋晟 picture Sheng Jiang 蒋晟 · Feb 10, 2010

That's ERROR_BUSY usually happens when IE is doing something else, e.g. displaying a window.alert message box.
Try suppress script errors and Implement IDocHostShowUI and return S_OK without blocking the message pump

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