如何使用 C# 在 RSS 提要的频道元素内插入元素 <item>..</item>?

How to insert an element <item>..</item> inside the channel element in a RSS feed using C#?

我正在寻找使用 C# 为网站创建 rss 提要的方法。我要尝试的是,一旦我单击一个按钮 ("Add Feed"),它就会创建一个节点元素,如下所示:

<item>
 <title> some title...here </title>
 <link> link to the article ...here </link>
 <description> article's description ...here </description>
</item>

这必须是 元素的子元素。因此,到目前为止,对于我编写的代码,它将上述元素插入到 rss xml 文件中,但它是在 元素之外执行的,如下所示:

<?xml version="1.0" encoding="utf-8"?>
<rss version="2.0">
  <channel>
    <title>Example Home Page</title>
    <link>http://www.example.com</link>
    <description>Educational Website...</description>
    <image>
      <url>http://www.example.com/images/logo.png</url>
      <title>Example.com</title>
      <link>http://www.example.com</link>
    </image>
    <category>Photography</category>
    <language>en-us</language>
  </channel>
<item>
 <title> some title...here </title>
 <link> link to the article ...here </link>
 <description> article's description ...here </description>
</item>
</rss>

这是代码:

 XmlDocument doc = new XmlDocument();

  XmlNode item = doc.CreateElement("item");

  XmlNode Title = doc.CreateElement("title");
  Title.InnerText = TextBoxTitle.Text;
  item.AppendChild(Title);

  XmlNode link = doc.CreateElement("link");
  link.InnerText = "http://www.example.com/" + DropDownListCategory.SelectedItem.Text + ".aspx?key=" + TextBoxLink.Text + ".txt";
  item.AppendChild(link);

  XmlNode description = doc.CreateElement("description");
  description.InnerText = TextBoxDescription.Text;
  item.AppendChild(description);

  doc.DocumentElement.AppendChild(item);
  doc.Save(Server.MapPath("~/rss.xml"));

我该怎么做?任何帮助或反馈将不胜感激。谢谢!!!

试试这个,如果我理解正确的话:

  XmlDocument doc = new XmlDocument();
  XmlNode rss = doc.CreateElement("rss");
  XmlAttribute version = doc.CreateAttribute("version");
  version.Value = "2.0";
  rss.Attributes.Append(version);
  XmlNode channel = doc.CreateElement("channel");

  XmlNode item = doc.CreateElement("item");

  XmlNode Title = doc.CreateElement("title");
  Title.InnerText = "Title Text";
  item.AppendChild(Title);

  XmlNode link = doc.CreateElement("link");
  link.InnerText = "http://www.example.com/.txt";
  item.AppendChild(link);

  XmlNode description = doc.CreateElement("description");
  description.InnerText = "DESC";
  item.AppendChild(description);

  channel.AppendChild(item);
  rss.AppendChild(channel);
  doc.AppendChild(rss);
  doc.Save(Server.MapPath("~/rss.xml"));

好的,现在我们知道文件已经保存在某个地方,试试这个:

  var xmldoc = new XmlDocument();
  xmldoc.Load(Server.MapPath("~/rss.xml"));

  XmlNode channelNode = xmldoc.SelectSingleNode("descendant::channel");

  if (channelNode != null)
  {
    XmlNode item = xmldoc.CreateElement("item");

    XmlNode Title = xmldoc.CreateElement("title");
  Title.InnerText = "Title Text";
  item.AppendChild(Title);

  XmlNode link = xmldoc.CreateElement("link");
  link.InnerText = "http://www.example.com/.txt";
  item.AppendChild(link);

  XmlNode description = xmldoc.CreateElement("description");
  description.InnerText = "DESC";
  item.AppendChild(description);

  channelNode.AppendChild(item);
  }
  doc.Save(Server.MapPath("~/rss.xml"));

.net 框架在 System.ServiceModel 中内置了对构建 RSS 提要的支持(您需要引用 System.ServiceModel.dll),最好用它来保证有效的 RSS xml,无论如何,最好还是自己构建 XML。延伸阅读 on MSDN.

例如..

// read in the existing rss xml
var rssFeedXml = XDocument.Load(@"c:\temp\rss3.xml"); // replace with server.mappath etc
var feed = SyndicationFeed.Load(rssFeedXml.CreateReader());      
var items = new List<SyndicationItem>(feed.Items);
feed.Items = items;

// add the new item
items.Add(
        new SyndicationItem(
        "some title...here ",
        "some description here",
        new Uri("http://example.come")));

// write the xml back out
var rssFormatter = new Rss20FeedFormatter(feed, false);
XDocument output = new XDocument();
using (var xmlWriter = output.CreateWriter())
    rssFormatter.WriteTo(xmlWriter);

output.Save(@"c:\temp\rss.xml");