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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