/// <summary>
/// XPath 是一门在 XML 文档中查找信息的语言。XPath 用于在 XML 文档中通过元素和属性进行导航。
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btn_XPathQuery_Click(object sender, RoutedEventArgs e)
{
TextRange tr = new TextRange(rbox_XPathInput.Document.ContentStart, rbox_XPathInput.Document.ContentEnd);
var html = tr.Text;
if (string.IsNullOrEmpty(html))
{
EMessageBox.Show("请输入html");
return;
}
var result = HtmlAgilityPackUtil.XPathQuery(html, this.tbox_XPath.Text.Trim());
if (result != null)
{
Paragraph paragraph = new Paragraph();
foreach (var item in result)
{
paragraph.Inlines.Add(new Run(item.OuterHtml + Environment.NewLine));
}
this.rbox_XPathOutput.Document = new FlowDocument(paragraph);
}
else
{
this.rbox_XPathOutput.Document.Blocks.Clear();
}
}
private async void ExtractBackgroundImage(object html)
{
//我这里是写的div，可能页面上用来显示图片的不一定是div，是其它元素也说不定，如li ol ul
var xpath = "//div";
var result = HtmlAgilityPackUtil.XPathQuery(html.ToString(), xpath);
foreach (var item in result)
{
var classAttribute = item.Attributes["class"];
if (classAttribute == null)
{
continue;
}
var className = classAttribute.Value;
var script = $"getComputedStyle(document.getElementsByClassName('{className}')[0]).backgroundImage";
//执行js
var backgroundImage = await globalData.Browser.browser.EvaluateScriptAsync(script);
if (backgroundImage.Result != null && backgroundImage.Result.ToString() != "none")
{
var mathch = RegexUtil.RegexMatch(backgroundImage.Result.ToString(), RegexPattern.MatchImgPattern);
if (mathch.Success)
{
lock (obj)
{
Dispatcher.Invoke(() =>
{
backgroundImageList.Add(mathch.Value);
ShowStatusText($"已抓取到{backgroundImageList.Count}个图像");
});
}
}
}
}
if (backgroundImageList.Count == 0)
{
ShowStatusText("解析已完成，未抓取到任何图像");
}
}
