如何在使用C＃的RSS提要中的通道元素內插入元素<item> ..</item>？

Question

我正在尋找爲使用C＃的網站創建RSS源。我試圖接近，一旦我點擊了一個按鈕（「添加頻道」），它想建立和節點元素，像這樣：

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

這必須是<通道的孩子>元素。所以，到目前爲止與我寫的代碼，它插入在RSS XML文件上述元件，但它確實它的<通道>元素以外，像這樣：

<?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> 

這是代碼：

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")); 

我該怎麼做？任何幫助或反饋將不勝感激。謝謝 ！！！

Answer 1

試試這個，如果我理解正確的要求：現在

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")); 

好了，我們得到了該文件已保存的地方，試試這個：

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")); 

Answer 2

.NET框架已建成爲了支持在System.ServiceModel（您需要System.ServiceModel.dll的引用）中構建RSS訂閱源，最好使用它來保證有效的RSS xml，並且更好地處理自己構造XML的工作。進一步閱讀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");