滚动web浏览器编程有时不工作 [英] Scrolling WebBrowser programatically sometimes doesn't work

问题描述

我使用了 System.Windows.Forms.WebBrowser 控制，我需要做的programaticaly滚动。

I'm using the System.Windows.Forms.WebBrowser control and I need to do programaticaly scrolling.

例如，我用这个code向下滚动：

For example, I use this code to scroll down:

WebBrowser.Document.Body.ScrollTop += WebBrowser.Height

的问题是，在某些站点它工作但在其他它不

The problem is that in some sites it works but in others it doesn't

http://news.google.com (works good)
http://stackoverflow.com/ (doesn't work)

这可能是一些有关身体code，但我想不通。
我也试着：

It's can be something about the body code, but I can't figure out.
I've also tried:

WebBrowser.Document.Window.ScrollTo(0, 50)

但这种方式，我不知道现在的位置。

but this way I don't know the current position.

推荐答案

本例中左右滚动条属性的怪癖，可能会导致您所看到的行为。

This example works around quirks in scroll bar properties that can cause the behavior you are seeing.

您将需要添加一个COM引用Microsoft HTML对象库（MSHTML），在此之前将工作。

You will need to add a COM reference to Microsoft HTML Object Library (mshtml) before this will work.

假设你有一个名为webBrowser1 web浏览器，你可以尝试以下。我用了几个不同的接口，因为我发现，返回滚动属性值不一致。

Assuming you have a WebBrowser named webBrowser1, you can try the following. I use a couple different interfaces because I have found that the values returned for the scroll properties are inconsistent.

            using mshtml;

// ... snip ...

            webBrowser1.Navigate("http://www.stackoverflow.com");
            while (webBrowser1.ReadyState != WebBrowserReadyState.Complete)
            {
                Application.DoEvents();
                System.Threading.Thread.Sleep(20);
            }
            Rectangle bounds = webBrowser1.Document.Body.ScrollRectangle;
            IHTMLElement2 body = webBrowser1.Document.Body.DomElement as IHTMLElement2;
            IHTMLElement2 doc = (webBrowser1.Document.DomDocument as IHTMLDocument3).documentElement as IHTMLElement2;
            int scrollHeight = Math.Max(body.scrollHeight, bounds.Height);
            int scrollWidth = Math.Max(body.scrollWidth, bounds.Width);
            scrollHeight = Math.Max(body.scrollHeight, scrollHeight);
            scrollWidth = Math.Max(body.scrollWidth, scrollWidth);
            doc.scrollTop = 500;

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