Why is WebBrowser_DocumentCompleted() firing twice?

user_257944 0
Viewed 28207

Well, I'm using a simple webbrowser control to browse to a page, so I need to change the Text of the form while doing so. I'm using - 

private void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
{
     this.Text += " - " + webBrowser1.Document.Domain;
}

but using a breakpoint, i noticed that, this event is firing twice. I even tried _Navigated() event. it also fired twice. Resulting the title to "Webber - google.co.in - google.co.in" ..

I also noticed that this event fired several times while loading msn.com.. I'm trying to change the text of the form only when the page has finished loading totally..

Any remedy?

navigation browser .net c#
9 Answers

You can check the WebBrowser.ReadyState when the event is fired:

if (browser.ReadyState != WebBrowserReadyState.Complete)
    return;

ReadyState will be set to Complete once the whole document is ready.

user_1318970

Every time a frame loads, the event is fired.

Also, before you even go there, the IsBusy property will only be True whilst the first frame has not loaded.

void BrowserDocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
{
  if (e.Url.AbsolutePath != (sender as WebBrowser).Url.AbsolutePath)
    return; 

  //The page is finished loading 
}
user_1033850

It gets fired once per frame.

user_748150
user_1099190

Actually, it doesn't always get fired. Haven't figured out why not. I have a timer and just check the ReadyState repeatedly for a few minutes. (Using embedded browser control).

user_2762030

if (browser.ReadyState != WebBrowserReadyState.Complete) is recommended.

And when there are frames in the page,DocumentCompleted will be fired several times.And this is difficult to solve.Some ways like checking the urls are not accurate.

BTW, why not using this:

this.Text = stringA + " - " + webBrowser1.Document.Domain;

Try to using a fixed prefix,problem may be solved easily.

user_12405010
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