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[英]Parsing Network Packets in XML format using C#: XPath or XDocument
[英]Format CDATA Type from RSS with C# XDocument or XPath in WPF
我正在嘗試格式化並獲取圖像,文本等。以提供良好的外觀。
XML是這樣的:
xmlns:content="http://purl.org/rss/1.0/modules/content/"
內容是:
<content:encoded>
<![CDATA[
<p><a href="http://i2.wp.com/geekytheory.com/wp-content/uploads/2014/03/Screen-Shot- 2013-11-11-at-11.38.50.png"><img class="size-full wp-image-7447 aligncenter" alt="Screen Shot 2013-11-11 at 11.38.50" src="http://i2.wp.com/geekytheory.com/wp- content/uploads/2014/03/Screen-Shot-2013-11-11-at-11.38.5
]]>
<![CDATA[
0.png?resize=788%2C644" data-recalc-dims="1" /></a></p> <p style="text-align: justify">
</p>]]>
< /content:encoded>
首先,我將得到的圖像或示例:他在content:encoded / p / a / img / src
我嘗試的代碼是:
private ObservableCollection<RssItem> ParseXmlString(string xmlString)
{
XDocument xmlDoc = XDocument.Parse(xmlString);
XNamespace xmns = @"http://purl.org/dc/elements/1.1/";
XNamespace xmnsContent = @"http://purl.org/rss/1.0/modules/content/";
var itemsList = xmlDoc.Descendants("item").Select(i => new RssItem()
{
Author = i.Element(xmns + "creator").Value,
Title = i.Element("title").Value,
Description = i.Element("description").Value,
Content = i.Element(xmnsContent + "encoded").Value,
Image = i.Element(xmnsContent + "encoded").XPathSelectElement("//p//a//img[@src]").Value,
Date = DateTime.Parse(i.Element("pubDate").Value)
}).ToList();
return new ObservableCollection<RssItem>(itemsList);
}
Content = i.Element(xmnsContent +“ encoded”)。Value給我所有內容,而沒有格式化如下內容:
為了從CData中提取圖像或其他元素,我得到了一個錯誤。 圖片= i.Element(xmnsContent +“ encoded”)。XPathSelectElement(“ // p // a // img [@src]”)。值給出錯誤。
我也嘗試過這種方法,但是給出了同樣的錯誤。
Image = i.Element(xmnsContent+"encoded").Element("p").Element("a").Element("img").Attribute("src").Value
謝謝大家的問候!!
最后,使用FlowDocumentScrollViewer和XmlToXamlConverter,我得到了解決方案:
<FlowDocumentScrollViewer
Document="{Binding Content, Converter={StaticResource HtmlToFlowDocConverter}}"/>
之后,我們需要添加一個Converter:
public object Convert(object value, Type targetType, object parameter,
CultureInfo culture)
{
var xaml = HtmlToXamlConverter.ConvertHtmlToXaml((string)value, true);
var flowDocument = XamlReader.Parse(xaml);
if (flowDocument is FlowDocument)
SubscribeToAllHyperlinks((FlowDocument)flowDocument);
return flowDocument;
}
private void SubscribeToAllHyperlinks(FlowDocument flowDocument)
{
var hyperlinks = GetVisuals(flowDocument).OfType<Hyperlink>();
foreach (var link in hyperlinks)
link.RequestNavigate += LinkRequestNavigate;
}
private static IEnumerable<DependencyObject> GetVisuals(DependencyObject root)
{
foreach (var child in
LogicalTreeHelper.GetChildren(root).OfType<DependencyObject>())
{
yield return child;
foreach (var descendants in GetVisuals(child))
yield return descendants;
}
}
private void LinkRequestNavigate(object sender,
System.Windows.Navigation.RequestNavigateEventArgs e)
{
Process.Start(new ProcessStartInfo(e.Uri.AbsoluteUri));
e.Handled = true;
}
public object ConvertBack(object value, Type targetType, object parameter,
CultureInfo culture)
{
throw new NotImplementedException();
}
}
最后,我們將從此處添加XmlToXamlConverter,並從此處添加另一個。
我的另一個有益的文章是這樣 。
問候!
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