检测WebBrowser控件上的滚动

Question

我有以下代码，奇怪的是，它可以工作几秒钟然后停止工作（我的事件处理程序方法停止被调用）：

public partial class Form1 : Form
{
    private void Form1_Load(object sender, EventArgs e)
    {
        webBrowser1.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(webBrowser1_DocumentCompleted);
        webBrowser1.Navigate("google.com");
    }

    private void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
    {
        if (!webBrowser1.IsBusy && webBrowser1.Url == e.Url && webBrowser1.ReadyState == WebBrowserReadyState.Complete)
        {
            HTMLWindowEvents_Event windowEvents = webBrowser1.Document.Window.DomWindow as HTMLWindowEvents_Event;
            windowEvents.onscroll += new HTMLWindowEvents_onscrollEventHandler(windowEvents_onscroll);
        }
    }

    private void windowEvents_onscroll()
    {
        HtmlDocument htmlDoc = webBrowser1.Document;
        int scrollTop = htmlDoc.GetElementsByTagName("HTML")[0].ScrollTop;
        string text = scrollTop.ToString();
    }
}

Answer 1

确定找到解决方案：

    protected override void OnDocumentCompleted(WebBrowserDocumentCompletedEventArgs e)
    {
        Follow();
        if (!IsBusy && Url == e.Url && ReadyState == WebBrowserReadyState.Complete)
        {
            Document.Window.AttachEventHandler("onscroll", DocScroll);
        }
    }

如果以这种方式连接它可以正常工作（到目前为止......）。甚至不需要使用mshtml。