Question

我曾尝试将此代码用于列表框中的插入Feed，但使用youtube Feed则无效。抱歉，但我对xml不太了解

XmlDocument RSSXml = new XmlDocument();
RSSXml.Load("http://gdata.youtube.com/feeds/api/users/google/uploads");

XmlNodeList RSSNodeList = RSSXml.SelectNodes("feed");
XmlNode RSSDesc = RSSXml.SelectSingleNode("feed");

 foreach (XmlNode RSSNode in RSSNodeList)
 {
     XmlNode RSSSubNode;
     RSSSubNode = RSSNode.SelectSingleNode("title");
     string title = RSSSubNode != null ? RSSSubNode.InnerText : "";
     RSSSubNode = RSSNode.SelectSingleNode("link");
     string link = RSSSubNode != null ? RSSSubNode.InnerText : "";
     listBox1.Items.Add(title);                   
}

相反，这是有效的

//Fetch the subscribed RSS Feed
XmlDocument RSSXml = new XmlDocument();
RSSXml.Load("mywebsite/feed/");

XmlNodeList RSSNodeList = RSSXml.SelectNodes("rss/channel/item");
XmlNode RSSDesc = RSSXml.SelectSingleNode("rss/channel/title");

foreach (XmlNode RSSNode in RSSNodeList)
{
    XmlNode RSSSubNode;
    RSSSubNode = RSSNode.SelectSingleNode("title");
    string title = RSSSubNode != null ? RSSSubNode.InnerText : "";
    RSSSubNode = RSSNode.SelectSingleNode("link");
    string link = RSSSubNode != null ? RSSSubNode.InnerText : "";                                       
    listBox1.Items.Add(title);
    listBox2.Items.Add(link); 
}

感谢您的回答

Answer 1

命名空间在选择xml文档中的节点时确实很有用。您必须添加名称空间管理器并明确指出您想要的元素。选择属性（对于链接）也不仅仅是元素的非文本。

     XmlDocument RSSXml = new XmlDocument(); 
     RSSXml.Load("http://gdata.youtube.com/feeds/api/users/google/uploads");  

    XmlNamespaceManager nsmgr = new XmlNamespaceManager(RSSXml.NameTable);
    nsmgr.AddNamespace("tns", "http://www.w3.org/2005/Atom");

    XmlNodeList RSSNodeList = RSSXml.SelectNodes("//tns:entry", nsmgr); 
    XmlNode RSSDesc = RSSXml.SelectSingleNode("tns:feed",nsmgr);   

    foreach (XmlNode RSSNode in RSSNodeList)  {      
        XmlNode RSSSubNode;      
        RSSSubNode = RSSNode.SelectSingleNode("tns:title", nsmgr);      
        string title = RSSSubNode != null ? RSSSubNode.InnerText : "";      
        RSSSubNode = RSSNode.SelectSingleNode("tns:link/@href",nsmgr);      
        string link = RSSSubNode != null ? RSSSubNode.InnerText : "";      

        Console.WriteLine("{0} {1}",title, link);
    }

请参阅SelectNodes with a namespacemanager

在列表框中输入YouTube错误

1 个答案: