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POHow to detect crashing tabed webbrowser and handle it?
 

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  1. POHow to detect crashing tabed webbrowser and handle it?
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    <p>I have a desktop application (forms) with a tab control, I assign a tab and a new custom webrowser control. I open up about 10 of these tabs. Each one visits about 100 - 500 different pages.</p> <p>The trouble is that if 1 webbrowser control has a problem it shuts down the entire program.</p> <p>I want to be able to close the offending webbrowser control and open a new one in it's place. </p> <p>Is there any event that I need to subscribe to catch a crashing or unresponsive webbrowser control ?</p> <p>I am using C# on windows 7 (Forms), .NET framework v4</p> <p>===============================================================</p> <h1><strong>UPDATE: 1 - The Tabbed WebBrowser Example</strong></h1> <p>Here is the code I have and How I use the webbrowser control in the most basic way.</p> <ol> <li>Create a new forms project and name it SimpleWeb</li> <li>Add a new class and name it myWeb.cs, here is the code to use.</li> </ol> <blockquote> <pre><code>using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Windows.Forms; using System.Security.Policy; namespace SimpleWeb { //inhert all of webbrowser class myWeb : WebBrowser { public myWeb() { //no javascript errors this.ScriptErrorsSuppressed = true; //Something we want set? AssignEvents(); } //keep near the top private void AssignEvents() { //assign WebBrowser events to our custom methods Navigated += myWeb_Navigated; DocumentCompleted += myWeb_DocumentCompleted; Navigating += myWeb_Navigating; NewWindow += myWeb_NewWindow; } #region Events //List of events:http://msdn.microsoft.com/en-us/library/system.windows.forms.webbrowser_events%28v=vs.100%29.aspx //Fired when a new windows opens private void myWeb_NewWindow(object sender, System.ComponentModel.CancelEventArgs e) { //cancel all popup windows e.Cancel = true; //beep to let you know canceled new window Console.Beep(9000, 200); } //Fired before page is navigated (not sure if its before or during?) private void myWeb_Navigating(object sender, System.Windows.Forms.WebBrowserNavigatingEventArgs args) { } //Fired after page is navigated (but not loaded) private void myWeb_Navigated(object sender, System.Windows.Forms.WebBrowserNavigatedEventArgs args) { } //Fired after page is loaded (Catch 22 - Iframes could be considered a page, can fire more than once. Ads are good examples) private void myWeb_DocumentCompleted(System.Object sender, System.Windows.Forms.WebBrowserDocumentCompletedEventArgs args) { } #endregion //Answer supplied by mo. (modified)? public void OpenUrl(string url) { try { //this.OpenUrl(url); this.Navigate(url); } catch (Exception ex) { MessageBox.Show("Your App Crashed! Because = " + ex.ToString()); //MyApplication.HandleException(ex); } } //Keep near the bottom private void RemoveEvents() { //Remove Events Navigated -= myWeb_Navigated; DocumentCompleted -= myWeb_DocumentCompleted; Navigating -= myWeb_Navigating; NewWindow -= myWeb_NewWindow; } } } </code></pre> </blockquote> <ol> <li><p>On Form1 drag a standard tabControl and set the dock to fill, you can go into the tab collection and delete the pre-populated tabs if you like.</p></li> <li><p>Right Click on Form1 and Select "View Code" and replace it with this code.</p></li> </ol> <blockquote> <pre><code>using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; using mshtml; namespace SimpleWeb { public partial class Form1 : Form { public Form1() { InitializeComponent(); //Load Up 10 Tabs for (int i = 0; i &lt;= 10; i++) { newTab("Test_" + i, "http://wwww.yahoo.com"); } } private void newTab(string Title, String Url) { //Create a new Tab TabPage newTab = new TabPage(); newTab.Name = Title; newTab.Text = Title; //create webbrowser Instance myWeb newWeb = new myWeb(); //Add webbrowser to new tab newTab.Controls.Add(newWeb); newWeb.Dock = DockStyle.Fill; //Add New Tab to Tab Pages tabControl1.TabPages.Add(newTab); newWeb.OpenUrl(Url); } } } </code></pre> </blockquote> <p>Save and Run the project.</p> <p>Using the answer below by mo. , you can surf the first url with no problem, but what about all the urls the user clicks on? How do we check those? </p> <p>I prefer not to add events to every single html element on a page, there has to be a way to run the new urls thru the function OpenUrl before it navigates without having an endless loop.</p> <p>Thanks.</p>
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    1. USDavid Eaton
    1. USDavid Eaton
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    1. COModern browsers deal with this by running each tab in a separate process. That's the *right* solution.
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      1. POHow to detect crashing tabed webbrowser and handle it?
      1. USDavid Heffernan
    2. COThis is why chrome uses a separate process for each tab
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    3. CO@DavidHeffernan I'd say that right solution in .net would be using different `AppDomain`s, not processes.
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      1. POHow to detect crashing tabed webbrowser and handle it?
      1. USSerg Rogovtsev
 

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