检测卷轴上的WebBrowser控件 [英] Detect scroll on a WebBrowser control

问题描述

我有以下的code表示，古怪，工作了几秒钟，然后停止工作（我的事件处理程序方法不再是所谓的）：

 公共部分类Form1中：形态
{
    私人无效Form1_Load的（对象发件人，EventArgs的）
    {
        webBrowser1.DocumentCompleted + =新WebBrowserDocumentCompletedEventHandler（webBrowser1_DocumentCompleted）;
        WebBrowser1.Navigate时（google.com）;
    }

    私人无效webBrowser1_DocumentCompleted（对象发件人，WebBrowserDocumentCompletedEventArgs E）
    {
        如果（webBrowser1.IsBusy＆安培;！＆安培; webBrowser1.Url == e.Url和放大器;＆安培; webBrowser1.ReadyState == WebBrowserReadyState.Complete）
        {
            HTMLWindowEvents_Event的WindowEvent = webBrowser1.Document.Window.DomWindow为HTMLWindowEvents_Event;
            windowEvents.onscroll + =新HTMLWindowEvents_onscrollEventHandler（windowEvents_onscroll）;
        }
    }

    私人无效windowEvents_onscroll（）
    {
        的HTMLDocument HTMLDOC = webBrowser1.Document;
        INT scrollTop的= htmlDoc.GetElementsByTagName（HTML）[0] .ScrollTop;
        字符串文本= scrollTop.ToString（）;
    }
}
 

解决方案

确定找到了解决方法：

 保护覆盖无效OnDocumentCompleted（WebBrowserDocumentCompletedEventArgs E）
    {
        遵循（）;
        如果（IsBusy＆安培;！＆安培; URL == e.Url和放大器;＆安培; readyState的== WebBrowserReadyState.Complete）
        {
            Document.Window.AttachEventHandler（onscroll，DocScroll）;
        }
    }
 

如果连接的方式，它的工作原理确定（到目前为止...）。甚至不需要使用MSHTML。

I have the following code that, weirdly, works for a couple of seconds and then stops working (my event handler method stops being called):

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();
    }
}

解决方案

OK Found a solution:

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

If attached that way it works OK (so far...). Don't even need to use mshtml.

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