Blocking Dialogs in .Net Webbrowser Control

Blocking dialogs in .NET WebBrowser control

This is most definitely hacky, but if you do any work with the WebBrowser control, you'll find yourself doing a lot of hacky stuff.

This is the easiest way that I know of to do this. You need to inject JavaScript to override the alert function... something along the lines of injecting this JavaScript function:

window.alert = function () { }

There are many ways to do this, but it is very possible to do. One possibility is to hook an implementation of the DWebBrowserEvents2 interface. Once this is done, you can then plug into the NavigateComplete, the DownloadComplete, or the DocumentComplete (or, as we do, some variation thereof) and then call an InjectJavaScript method that you've implemented that performs this overriding of the window.alert method.

Like I said, hacky, but it works :)

I can go into more details if I need to.

Prevent WebBrowser autocomplete passwords popup

This popup is NOT from JavaScript... It's from IE.

You can try this, if you have access to the registry from your app:

https://support.microsoft.com/en-us/help/229940/how-to-disable-internet-explorer-password-caching

BUT: This is also canceling this Popup for the normal IE Browser outside your app!!!

help can I stop wpf webbrowser popups?

Unfortunately there is no good way to
archive this right now. This is a good
feedback. We will add it to the list
of things to provide for the
WebBrowser control in the future
release.

Source:

http://social.msdn.microsoft.com/Forums/en-US/wpf/thread/4d4fa88e-b8c8-4190-8153-db923ed0e24e/

Disabling alert window in WebBrowser control

Try

WebBrowser1.ScriptErrorsSuppressed = true;

How to handle Message Boxes while using webbrowser in C#?

You can "manage" the message box dialog by importing some window functions from user32.dll and getting the messagebox dialog's handle by it's class name and window name. For example to click its OK button:

public class Foo
{
    [DllImport("user32.dll", SetLastError = true)]
    static extern IntPtr FindWindowEx(IntPtr hwndParent, IntPtr hwndChildAfter, string lpszClass, string lpszWindow);

    [DllImport("user32.dll", EntryPoint = "FindWindow", SetLastError = true)]
    private static extern IntPtr FindWindow(string lpClassName, string lpWindowName);

    [DllImport("user32.dll", CharSet = CharSet.Auto)]
    static extern IntPtr SendMessage(IntPtr hWnd, UInt32 Msg, IntPtr wParam, IntPtr lParam);

    private void ClickOKButton()
    {
        IntPtr hwnd = FindWindow("#32770", "Message from webpage");
        hwnd = FindWindowEx(hwnd, IntPtr.Zero, "Button", "OK");
        uint message = 0xf5;
        SendMessage(hwnd, message, IntPtr.Zero, IntPtr.Zero);
    }
}

Some reading material from MSDN.

handling Security Messages in .NET WebBrowser Control

IInternetSecurityManager requires IQueryInterface.
I didn't have IQueryInterface implemented in my application which was why it wasn't working.

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