从CefSharp Web浏览器获取HTML源代码 [英] Get HTML source code from CefSharp web browser

问题描述

我正在使用aCefSharp.Wpf.ChromiumWebBrowser（版本47.0.3.0）加载网页。页面加载后，我想获取源代码。

I am using aCefSharp.Wpf.ChromiumWebBrowser (Version 47.0.3.0) to load a web page. Some point after the page has loaded I want to get the source code.

我打电话给了：

wb.GetBrowser().MainFrame.GetSourceAsync()

但是似乎并没有返回所有源代码（我相信这是因为存在子框架）。

however it does not appear to be returning all the source code (I believe this is because there are child frames).

如果我调用：

wb.GetBrowser().MainFrame.ViewSource() 

我可以看到它列出了所有源代码（包括内部框架）。

I can see it lists all the source code (including the inner frames).

我希望得到与ViewSource（）相同的结果。有人可以指出我的正确方向吗？

I would like to get the same result as ViewSource(). Could some one point me in the right direction please?

更新-添加了代码示例

注意：Web浏览器指向的地址也只能在2016年10月3日（含）使用。之后，它可能会显示不同的数据，而不是我要查看的数据。

在frmSelection.xaml文件中

In the frmSelection.xaml file

<cefSharp:ChromiumWebBrowser Name="wb" Grid.Column="1" Grid.Row="0" />

在frmSelection.xaml.cs文件中

In the frmSelection.xaml.cs file

public partial class frmSelection : UserControl
{
    private System.Windows.Threading.DispatcherTimer wbTimer = new System.Windows.Threading.DispatcherTimer();

    public frmSelection()
    {

         InitializeComponent();

         // This timer will start when a web page has been loaded.
         // It will wait 4 seconds and then call wbTimer_Tick which 
         // will then see if data can be extracted from the web page.
         wbTimer.Interval = new TimeSpan(0, 0, 4);
         wbTimer.Tick += new EventHandler(wbTimer_Tick);

         wb.Address = "http://www.racingpost.com/horses2/cards/card.sd?race_id=644222&r_date=2016-03-10#raceTabs=sc_";

         wb.FrameLoadEnd += new EventHandler<CefSharp.FrameLoadEndEventArgs>(wb_FrameLoadEnd);

    }

        void wb_FrameLoadEnd(object sender, CefSharp.FrameLoadEndEventArgs e)
        {
            if (wbTimer.IsEnabled)
                wbTimer.Stop();

            wbTimer.Start();
        }

    void wbTimer_Tick(object sender, EventArgs e)
    {
        wbTimer.Stop();
        string html = GetHTMLFromWebBrowser();
    }

    private string GetHTMLFromWebBrowser()
    {
         // call the ViewSource method which will open up notepad and display the html.
         // this is just so I can compare it to the html returned in GetSourceAsync()
         // This is displaying all the html code (including child frames)
            wb.GetBrowser().MainFrame.ViewSource();

         // Get the html source code from the main Frame.
            // This is displaying only code in the main frame and not any child frames of it.
            Task<String> taskHtml = wb.GetBrowser().MainFrame.GetSourceAsync();

            string response = taskHtml.Result;
     return response;
  }

}

推荐答案

我认为我不太了解这种 DispatcherTimer 解决方案。我会这样：

I don't think I quite get this DispatcherTimer solution. I would do it like this:

public frmSelection()
{
    InitializeComponent();

    wb.FrameLoadEnd += WebBrowserFrameLoadEnded;
    wb.Address = "http://www.racingpost.com/horses2/cards/card.sd?race_id=644222&r_date=2016-03-10#raceTabs=sc_";
}

private void WebBrowserFrameLoadEnded(object sender, FrameLoadEndEventArgs e)
{
    if (e.Frame.IsMain)
    {
        wb.ViewSource();
        wb.GetSourceAsync().ContinueWith(taskHtml =>
        {
            var html = taskHtml.Result;
        });
    }
}

我对<$ c的输出进行了比较$ c> ViewSource 和 html 变量中的文本是相同的，因此我在这里无法重现您的问题。

I did a diff on the output of ViewSource and the text in the html variable and they are the same, so I can't reproduce your problem here.

这是说，我注意到主机装入的时间很晚，因此您必须等待一段时间，直到记事本随源一起弹出。

This said, I noticed that the main frame gets loaded pretty late, so you have to wait quite a while until the notepad pops up with the source.

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