Contrôle WebBrowser de chargement de la page d'erreur

Vous souhaitez gérer le NavigateError événement comme le montre ici

Edit: y compris des exemples de code à partir du lien:

using System;
using System.Windows.Forms;
using System.Runtime.InteropServices;
using System.Security.Permissions;
namespace WebBrowserExtensibility
{
[PermissionSetAttribute(SecurityAction.Demand, Name="FullTrust")]
public class Form1 : Form
{
[STAThread]
public static void Main()
{
Application.Run(new Form1());
}
private WebBrowser2 wb = new WebBrowser2();
public Form1()
{
wb.Dock = DockStyle.Fill;
wb.NavigateError += new 
WebBrowserNavigateErrorEventHandler(wb_NavigateError);
Controls.Add(wb);
//Attempt to navigate to an invalid address.
wb.Navigate("www.widgets.microsoft.com");
}
private void wb_NavigateError(
object sender, WebBrowserNavigateErrorEventArgs e)
{
//Display an error message to the user.
MessageBox.Show("Cannot navigate to " + e.Url);
}
}
public class WebBrowser2 : WebBrowser
{
AxHost.ConnectionPointCookie cookie;
WebBrowser2EventHelper helper;
[PermissionSetAttribute(SecurityAction.LinkDemand, Name="FullTrust")]
protected override void CreateSink()
{
base.CreateSink();
//Create an instance of the client that will handle the event
//and associate it with the underlying ActiveX control.
helper = new WebBrowser2EventHelper(this);
cookie = new AxHost.ConnectionPointCookie(
this.ActiveXInstance, helper, typeof(DWebBrowserEvents2));
}
[PermissionSetAttribute(SecurityAction.LinkDemand, Name="FullTrust")]
protected override void DetachSink()
{
//Disconnect the client that handles the event
//from the underlying ActiveX control.
if (cookie != null)
{
cookie.Disconnect();
cookie = null;
}
base.DetachSink();
}
public event WebBrowserNavigateErrorEventHandler NavigateError;
//Raises the NavigateError event.
protected virtual void OnNavigateError(
WebBrowserNavigateErrorEventArgs e)
{
if (this.NavigateError != null)
{
this.NavigateError(this, e);
}
}
//Handles the NavigateError event from the underlying ActiveX 
//control by raising the NavigateError event defined in this class.
private class WebBrowser2EventHelper : 
StandardOleMarshalObject, DWebBrowserEvents2
{
private WebBrowser2 parent;
public WebBrowser2EventHelper(WebBrowser2 parent)
{
this.parent = parent;
}
public void NavigateError(object pDisp, ref object url, 
ref object frame, ref object statusCode, ref bool cancel)
{
//Raise the NavigateError event.
this.parent.OnNavigateError(
new WebBrowserNavigateErrorEventArgs(
(String)url, (String)frame, (Int32)statusCode, cancel));
}
}
}
//Represents the method that will handle the WebBrowser2.NavigateError event.
public delegate void WebBrowserNavigateErrorEventHandler(object sender, 
WebBrowserNavigateErrorEventArgs e);
//Provides data for the WebBrowser2.NavigateError event.
public class WebBrowserNavigateErrorEventArgs : EventArgs
{
private String urlValue;
private String frameValue;
private Int32 statusCodeValue;
private Boolean cancelValue;
public WebBrowserNavigateErrorEventArgs(
String url, String frame, Int32 statusCode, Boolean cancel)
{
urlValue = url;
frameValue = frame;
statusCodeValue = statusCode;
cancelValue = cancel;
}
public String Url
{
get { return urlValue; }
set { urlValue = value; }
}
public String Frame
{
get { return frameValue; }
set { frameValue = value; }
}
public Int32 StatusCode
{
get { return statusCodeValue; }
set { statusCodeValue = value; }
}
public Boolean Cancel
{
get { return cancelValue; }
set { cancelValue = value; }
}
}
//Imports the NavigateError method from the OLE DWebBrowserEvents2 
//interface. 
[ComImport, Guid("34A715A0-6587-11D0-924A-0020AFC7AC4D"),
InterfaceType(ComInterfaceType.InterfaceIsIDispatch),
TypeLibType(TypeLibTypeFlags.FHidden)]
public interface DWebBrowserEvents2
{
[DispId(271)]
void NavigateError(
[In, MarshalAs(UnmanagedType.IDispatch)] object pDisp,
[In] ref object URL, [In] ref object frame, 
[In] ref object statusCode, [In, Out] ref bool cancel);
}
}

OriginalL'auteur stuartd