.NET WebBrowser 控件新窗口上的 Javascript Window.Opener 对象 Null

Question

嗯，我在 .NET Framework 的 WebBroswer 控件中有一个弹出窗口，我使用 NewWindow 事件处理程序捕获它，就像这样。

WebBrowser w = new WebBrowser();
SHDocVw.WebBrowser_V1 web = (SHDocVw.WebBrowser_V1)w.ActiveXInstance;
web.NewWindow += new SHDocVw.DWebBrowserEvents_NewWindowEventHandler(web_NewWindow);

新的 Popup 采用新形式，带有 WebBrowser 控件的新实例。

void web_NewWindow(string URL, int Flags, string TargetFrameName, ref object PostData, string Headers, ref bool Processed)
    {
        Processed = true;
        WebBrowser w2 = new WebBrowser();

        Form PopUp = new Form();
        PopUp.Controls.Clear();
        PopUp.Controls.Add(w2);
        w2.Dock = DockStyle.Fill;
        PopUp.Show();
        w2.Navigate(URL);
        w2.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(w2_DocumentCompleted);
    }

我的问题是 Window.Opener 对象在进程中为空。

页面使用该字段将用户返回到原始窗口并在表单上填写一些值。

是否可以将 Window.Opener 对象从一个 WebBrowser 控件传递到下一个控件？这似乎不可能，但我必须尝试。

谢谢

Answer 1

是的，有办法将 Window.Opener 对象从一个 WebBrowser 控件传递到下一个。
有关详细信息，请参阅下面的代码。

public class WebBrowserTest
{
    private WebBrowser _wParent;

    // entry point
    public void Navigate(string url)
    {
        _wParent = new WebBrowser();
        SHDocVw.WebBrowser_V1 v1 = (SHDocVw.WebBrowser_V1)w.ActiveXInstance;
        v1.NewWindow += v1_NewWindow;
    }

    private void v1_NewWindow(string URL, int Flags, string TargetFrameName, ref object PostData, string Headers, ref bool Processed)
    {
        // tell, that we'll open new page by ourselves
        Processed = true;

        // open page by ourselves
        WebBrowser w2 = new WebBrowser();
        w2.Navigate(url);

        // wait for document will be loaded to do some magic stuff then
        w2.DocumentCompleted += w2_DocumentCompleted;
    }

    // sets opener for popup window
    // after document in popup window was loaded
    private void w2_DocumentCompleted(object sender, EventArgs e)
    {
        WebBrowser popup = (WebBrowser)sender;
        SetOpener(_wparent, popup);
    }

    // My most favorite method :)
    // Contains exactly that hack, we're talking about
    private void SetOpener(WebBrowser opener, WebBrowser popup)
    {    
        HtmlWindow htmlPopup = popup.Document.Window;
        HtmlWindow htmlOpener = opener.Document.Window;

        // let the dark magic begin

        // actually, WebBrowser control is .NET wrapper around IE COM interfaces
        // we can get a bit closer to them access by getting reference to 
        // "mshtml.IHTMLWindow2" field via Reflection
        FieldInfo fi = htmlPopup.GetType().GetField("htmlWindow2", BindingFlags.Instance | BindingFlags.NonPublic);

        mshtml.IHTMLWindow2 htmlPopup2 = (mshtml.IHTMLWindow2)fi.GetValue(htmlPopup);
        mshtml.IHTMLWindow2 htmlOpener2 = (mshtml.IHTMLWindow2)fi.GetValue(htmlOpener);

        // opener is set here
        htmlPopup2.window.opener = htmlOpener2.window.self;
    }
}

附言我知道，它仍然是实际的机会非常小，但是，无论如何 =)

Answer 2

对于那些正在寻找 WPF 版本解决方案的人，将 SetOpener 函数重写为：

public static void SetOpener(System.Windows.Controls.WebBrowser opener, System.Windows.Controls.WebBrowser popup)
{
    mshtml.IHTMLWindow2 htmlPopup = (popup.Document as mshtml.HTMLDocument).parentWindow;
    mshtml.IHTMLWindow2 htmlOpener = (opener.Document as mshtml.HTMLDocument).parentWindow;
    htmlPopup.window.opener = htmlOpener.window.self;
}

在子端 WebBrowser 的事件处理程序中使用它：

private void browser_LoadCompleted(object sender, NavigationEventArgs eventArgs)
        {
            WebBrowser popup = (WebBrowser)sender;
            SetOpener(parentWebBrowser, popup);
        }

还有 WPF 部分：

<Grid>
    <WebBrowser Name="webBrowser" LoadCompleted="browser_LoadCompleted" />
</Grid>

希望我只是将其他人从数小时的试验、错误和无休止的谷歌搜索中拯救出来。