sdk/samples/all in on code/Visual Studio 2008/CSWebBrowserSuppressError/WebBrowserEx.cs

   1 /****************************** Module Header ******************************\
   2 * Module Name:  WebBrowserEx.cs
   3 * Project:          CSWebBrowserSuppressError
   4 * Copyright (c) Microsoft Corporation.
   5 *
   6 * This WebBrowserEx class inherits WebBrowser class and supplies following
   7 * features.
   8 * 1. Disable JIT Debugger.
   9 * 2. Suppress html element errors of document loaded in this browser.
  10 * 3. Handle navigation error.
  11 *
  12 * The class WebBrowser itself also has a Property ScriptErrorsSuppressed to hides
  13 * all its dialog boxes that originate from the underlying ActiveX control, not
  14 * just script errors.
  15 *
  16 * This source is subject to the Microsoft Public License.
  17 * See http://www.microsoft.com/opensource/licenses.mspx#Ms-PL.
  18 * All other rights reserved.
  19 *
  20 * THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND,
  21 * EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED
  22 * WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR PURPOSE.
  23 \***************************************************************************/
  24
  25 using System;
  26 using System.Security.Permissions;
  27 using System.Windows.Forms;
  28 using Microsoft.Win32;
  29
  30
  31 namespace CSWebBrowserSuppressError
  32 {
  33     public partial class WebBrowserEx : WebBrowser
  34     {
  35         /// <summary>
  36         /// Get or Set whether JIT debugger needs to be disabled. You have to restart the
  37         /// browser to take effect.
  38         /// </summary>
  39         public static bool JITDebuggerDisabled
  40         {
  41             get
  42             {
  43                 using (RegistryKey ieMainKey = Registry.CurrentUser.OpenSubKey(
  44                     @"Software\Microsoft\Internet Explorer\Main"))
  45                 {
  46                     string keyvalue = ieMainKey.GetValue("Disable Script Debugger") as string;
  47                     return string.Equals(keyvalue, "yes", StringComparison.OrdinalIgnoreCase);
  48                 }
  49             }
  50             set
  51             {
  52                 var newValue = value ? "yes" : "no";
  53
  54                 using (RegistryKey ieMainKey = Registry.CurrentUser.OpenSubKey(
  55                     @"Software\Microsoft\Internet Explorer\Main", true))
  56                 {
  57                     string keyvalue = ieMainKey.GetValue("Disable Script Debugger") as string;
  58                     if (!keyvalue.Equals(newValue, StringComparison.OrdinalIgnoreCase))
  59                     {
  60                         ieMainKey.SetValue("Disable Script Debugger", newValue);
  61                     }
  62                 }
  63             }
  64         }
  65
  66         // Suppress html element errors.
  67         public bool HtmlElementErrorsSuppressed { get; set; }
  68
  69         AxHost.ConnectionPointCookie cookie;
  70
  71         WebBrowser2EventHelper helper;
  72
  73         public event EventHandler<WebBrowserNavigateErrorEventArgs> NavigateError;
  74
  75         [PermissionSetAttribute(SecurityAction.LinkDemand, Name = "FullTrust")]
  76         public WebBrowserEx()
  77         {
  78         }
  79
  80         /// <summary>
  81         /// Register the Document.Window.Error event.
  82         /// </summary>
  83         [PermissionSetAttribute(SecurityAction.LinkDemand, Name = "FullTrust")]
  84         protected override void OnDocumentCompleted(WebBrowserDocumentCompletedEventArgs e)
  85         {
  86             base.OnDocumentCompleted(e);
  87
  88             // Occurs when script running inside of the window encounters a run-time error.
  89             this.Document.Window.Error += new HtmlElementErrorEventHandler(Window_Error);
  90         }
  91
  92
  93         /// <summary>
  94         /// Handle html element errors of document loaded in this browser.
  95         /// If HtmlElementErrorsSuppressed is set to true, then set the
  96         /// Handled flag to true sothat browser will not display this error.
  97         /// </summary>
  98         protected void Window_Error(object sender, HtmlElementErrorEventArgs e)
  99         {
 100             if (HtmlElementErrorsSuppressed)
 101             {
 102                 e.Handled = true;
 103             }
 104         }
 105
 106
 107         /// <summary>
 108         /// Associates the underlying ActiveX control with a client that can
 109         /// handle control events including NavigateError event.
 110         /// </summary>
 111         [PermissionSetAttribute(SecurityAction.LinkDemand, Name = "FullTrust")]
 112         protected override void CreateSink()
 113         {
 114             base.CreateSink();
 115
 116             helper = new WebBrowser2EventHelper(this);
 117             cookie = new AxHost.ConnectionPointCookie(
 118                 this.ActiveXInstance, helper, typeof(DWebBrowserEvents2));
 119         }
 120
 121
 122         /// <summary>
 123         /// Releases the event-handling client attached in the CreateSink method
 124         /// from the underlying ActiveX control
 125         /// </summary>
 126         [PermissionSetAttribute(SecurityAction.LinkDemand, Name = "FullTrust")]
 127         protected override void DetachSink()
 128         {
 129             if (cookie != null)
 130             {
 131                 cookie.Disconnect();
 132                 cookie = null;
 133             }
 134             base.DetachSink();
 135         }
 136
 137
 138         /// <summary>
 139         ///  Raises the NavigateError event.
 140         /// </summary>
 141         protected virtual void OnNavigateError(WebBrowserNavigateErrorEventArgs e)
 142         {
 143             if (this.NavigateError != null)
 144             {
 145                 this.NavigateError(this, e);
 146             }
 147         }
 148     }
 149 }