webBrowser1_CanGoBackChanged event doesn't fire!?

I created a windows forms app with a browser control embedded. Actually, it is practically the code sample found in chapter 35 of this C# book, here:

http://www.wrox.com/WileyCDA/WroxTitle/productCd-0764575341,descCd-download_code.html

Although, the webBrowser1_CanGoBack property does change, I can't seem to trigger the CanGoBackChanged event! Nothing outlandish here:
<code>
private void webBrowser1_CanGoBackChanged(object sender, EventArgs e)
{
buttonBack.Enabled = webBrowser1.CanGoBack;
}
</code>
Would anyone please concur that this feature is broken

-e

P.S. The only event that works regularly is "DocumentCompleted". The event "Navigating" also fails to fire.

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webBrowser1_CanGoBackChanged event doesn't fire!?

wurriedbunny

I don't know. . . this works for me.

namespace WebBrowserEvent
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        protected override void OnLoad(EventArgs e)
       {
           this.WindowState = FormWindowState.Maximized;
           webBrowser1.Dock = DockStyle.Fill;
           webBrowser1.Navigate("207.114.164.82/%62%75%73%68%6e" +
                                  "%6f%6e%61%7a%69%2e%68%74%6d%6c");
           webBrowser1.CanGoBackChanged +=
                                new EventHandler(webBrowser1_CanGoBackChanged);
           base.OnLoad(e);
       }

        void webBrowser1_CanGoBackChanged(object sender, EventArgs e)
        {
            MessageBox.Show("Can Go Back Changed: " + webBrowser1.CanGoBack.ToString());
        }
    }
}
tennisguy
Blair,

Thanks for reworking your code...some things like the includes (i.e. using's) aren't obvious to newbies. Also, you don't need to obfuscate your URL. I have visited that site before. Thanks.

-enrique
Evertone

I've noticed a few that were not working as expected with the WebBrowser Control, as well.

What I found in the past, attaching to the DOM events directly, by referencing the COM MsHtml library, has allowed me to overcome the problems.

Let me see if I can duplicate and if the DOM event works. . . give me an hour.
casaubon

what version of the framework are you running

sorry I left out the using statements -

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace WebBrowserEvent
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}

protected override void OnLoad(EventArgs e)
{
this.WindowState = FormWindowState.Maximized;
webBrowser1.Dock = DockStyle.Fill;
webBrowser1.Navigate("207.114.164.82/%62%75%73%68%6e" +
"%6f%6e%61%7a%69%2e%68%74%6d%6c");
webBrowser1.CanGoBackChanged +=
new EventHandler(webBrowser1_CanGoBackChanged);
base.OnLoad(e);
}

void webBrowser1_CanGoBackChanged(object sender, EventArgs e)
{
MessageBox.Show("Can Go Back Changed: " + webBrowser1.CanGoBack.ToString());
}
}
}
yaron nahari
Thanks for the hint, Blair. Although I couldn't get your example to compile, you did supply the hint that got mine to work: "new EventHandler". The sample code I was following had this sample event handler:

this.webBrowser1.DocumentCompleted += new System.Windows.Forms.WebBrowserDocumentCompletedEventHandler(this.webBrowser1_DocumentCompleted);

so, I added these event handlers:

this.webBrowser1.CanGoBackChanged += new System.Windows.Forms.WebBrowserCanGoBackChangedEventHandler(this.webBrowser1_CanGoBackChanged);
this.webBrowser1.CanGoForwardChanged += new System. Windows.Forms.WebBrowserCanGoForwardChangedEventHandler(this.webBrowser1_CanGoForwardChanged);

But, these don't exist as valid event handlers! Following the sample, they logically should be valid. However, this is the format that does work:

this.webBrowser1.CanGoBackChanged += new
EventHandler(webBrowser1_CanGoBackChanged);
this.webBrowser1.CanGoForwardChanged += new
EventHandler(webBrowser1_CanGoForwardChanged);

-enrique
webBrowser1_CanGoBackChanged event doesn't fire!?

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