I think the problem is that the ASP.NET worker process uses MTA threads,
which won't work with the WebBrowser. I had a similar problem in trying to
use the WebBrowser from a ThreadPool thread, which I solved by explicitly
creating a new thread, and then running the WebBrowser in that new thread.
Thread STAthread = new Thread(new ThreadStart(this.DoIEWork));
STAthread.ApartmentState = ApartmentState.STA;
STAthread.Start();
In the DoIEWork method, I created and used the WebBrowser control. NOTE the
web browser control is not thread safe! If you using this method, create a
static object to lock on, otherwise you'll have problems
private void DoIEWork() {
lock (_someStaticLockObject) {
System.Windows.Forms.Form frm = new System.Windows.Forms.Form();
AxSHDocVw.AxWebBrowser wb = new AxSHDocVw.AxWebBrowser();
((System.ComponentModel.ISupportInitialize)(wb)).BeginInit();
frm.Controls.Add(wb);
((System.ComponentModel.ISupportInitialize)(wb)).EndInit();
... do work here ...
wb.Dispose();
}
}
However, if all you are doing is getting the HTML, I would use the
HttpWebRequest and HttpWebResponse objects instead. They are much lighter,
faster, and you won't be downloading all the images, executing the
javascript, etc. I believe the HttpWebResponse handles redirects, but I
haven't confirmed this. Anyone?
Erick
----- Original Message -----
From: "Keyen" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Wednesday, August 07, 2002 9:25 PM
Subject: [ADVANCED-DOTNET] shdocvw.dll and asp.net threading
Hi,
i'm trying to use shdocvw.dll (web browser activeX control). I successfully
imported the activeX control into a class library (contained in a
userControl).
i can reference this assembly in a vb.net project and perform any work need
with the activeX control.
my problem is that i cannot successfully use this assembly in asp.net. I
get the following message:
Could not instantiate ActiveX control '8856f961-340a-11d0-a96b-
00c04fd705a2' because the current thread is not in a single-threaded
apartment.
i've searched the internet and found that his mostly occurs when c#
programmers don't add the [ stathread ] attribute to their main() method
(vb.net programmers don't have this issue since vb.net in it's great
wisdom does this for you)
Can anyone help me out?
btw:
i'm am trying to build an assembly can be used thru asp.net to 'browse' to
a web page and return the html, maybe there's an easier way that i haven't
found yet. The reason that i'm using the shdocvw.dll control is because
it'll also execute any client side code (such as redirects). any
suggestions would be appreciated.
thanks
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