window.showModelessDialog と window.showModalDialog は、INewWindowManager インターフェイスを実装することでブロックできます。さらに、以下のコードは、IDocHostShowUI を実装して警告ダイアログをブロックする方法を示しています。
public class MyBrowser : WebBrowser
{
[PermissionSetAttribute(SecurityAction.LinkDemand, Name = "FullTrust")]
public MyBrowser()
{
}
protected override WebBrowserSiteBase CreateWebBrowserSiteBase()
{
var manager = new NewWindowManagerWebBrowserSite(this);
return manager;
}
protected class NewWindowManagerWebBrowserSite : WebBrowserSite, IServiceProvider, IDocHostShowUI
{
private readonly NewWindowManager _manager;
public NewWindowManagerWebBrowserSite(WebBrowser host)
: base(host)
{
_manager = new NewWindowManager();
}
public int ShowMessage(IntPtr hwnd, string lpstrText, string lpstrCaption, int dwType, string lpstrHelpFile, int dwHelpContext, out int lpResult)
{
lpResult = 0;
return Constants.S_OK; // S_OK Host displayed its UI. MSHTML does not display its message box.
}
// Only files of types .chm and .htm are supported as help files.
public int ShowHelp(IntPtr hwnd, string pszHelpFile, uint uCommand, uint dwData, POINT ptMouse, object pDispatchObjectHit)
{
return Constants.S_OK; // S_OK Host displayed its UI. MSHTML does not display its message box.
}
#region Implementation of IServiceProvider
public int QueryService(ref Guid guidService, ref Guid riid, out IntPtr ppvObject)
{
if ((guidService == Constants.IID_INewWindowManager && riid == Constants.IID_INewWindowManager))
{
ppvObject = Marshal.GetComInterfaceForObject(_manager, typeof(INewWindowManager));
if (ppvObject != IntPtr.Zero)
{
return Constants.S_OK;
}
}
ppvObject = IntPtr.Zero;
return Constants.E_NOINTERFACE;
}
#endregion
}
}
[ComVisible(true)]
[Guid("01AFBFE2-CA97-4F72-A0BF-E157038E4118")]
public class NewWindowManager : INewWindowManager
{
public int EvaluateNewWindow(string pszUrl, string pszName,
string pszUrlContext, string pszFeatures, bool fReplace, uint dwFlags, uint dwUserActionTime)
{
// use E_FAIL to be the same as CoInternetSetFeatureEnabled with FEATURE_WEBOC_POPUPMANAGEMENT
//int hr = MyBrowser.Constants.E_FAIL;
int hr = MyBrowser.Constants.S_FALSE; //Block
//int hr = MyBrowser.Constants.S_OK; //Allow all
return hr;
}
}