Question

我从我的数据库获取Rss Feed但是我得到了所有的提要，每次我在DB数据中运行我的代码时都在添加。我需要显示Rss Feed in Count以及如何忽略DB中已经添加的提要和我在Repeater控件中显示的源代码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Xml;
using System.Text;
using System.Data.SqlClient;
using System.Web.UI.HtmlControls;
using System.Web.Security;
using System.Data;

public partial class _Default : System.Web.UI.Page
{
    RssDC rssDC = new RssDC();
    RssBAL rssBAL = new RssBAL();
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack) { 
        //List<RSSFeed> rssFeedList = new List<RSSFeed>();
        //var item = BlogFeeds("http://rss.cnn.com/rss/edition_americas.rss",  3, rssFeedList);
        //var item2 = BlogFeeds("http://feeds.bbci.co.uk/news/rss.xml?edition=int#",  3, rssFeedList);
        //var item3 = BlogFeeds("http://feeds.reuters.com/reuters/Election2012", 3, rssFeedList);
        //Repeater1.DataSource = item3;
        //Repeater1.DataBind();

        BlogFeeds("http://rss.cnn.com/rss/edition_americas.rss", 3);

        fillRssFeeds();
        }

    }

    private void fillRssFeeds()
    {        
        DataSet ds = new DataSet();
        ds = rssBAL.GetRssFeeds(rssDC);

        Repeater1.DataSource = ds;
        Repeater1.DataBind();
    }
    protected void BlogFeeds(string url,  int count)
    {

        try
        {

            RssDC rssDC = new RssDC();
            XmlDocument xmldoc = new XmlDocument();
            XmlNodeList items = default(XmlNodeList);
            xmldoc.Load(url);
            items = xmldoc.SelectNodes("/rss/channel/item");

            // use XPath to get only items

            foreach (XmlNode item1 in items)
            {

                foreach (XmlNode node1 in item1.ChildNodes)
                {
                    if (node1.Name == "title")
                    {
                        rssDC.Title = node1.InnerText;
                    }
                    else if (node1.Name == "link")
                    {
                        rssDC.Link = node1.InnerText;
                    }
                    else if(node1.Name == "guid")
                    {
                        rssDC.RSS_ID = node1.InnerText;
                    }
                    else if (node1.Name == "description")
                    {
                        rssDC.Description = node1.InnerText;
                    }
                    else if (node1.Name == "pubDate")
                    {
                        rssDC.DatePublished = node1.InnerText;
                    }


                }
                rssDC = RssBAL.AddRssFeed(rssDC);


            }

        }
        catch (Exception eax)
        {
            //return;
        }

        //return rssFeedList;
        //Repeater1.DataSource = rssFeedList;
        //Repeater1.DataBind();
    }

Answer 1

如果你只想根据你从BlogFeeds（）提供的输入参数检索一定数量的文章，你可以尝试这样的事情：

foreach (XmlNode item1 in items)
            {
                int currentIterationIndex = 0;

                foreach (XmlNode node1 in item1.ChildNodes)
                {
                    if(currentIterationIndex >= count -1)
                    {
                        continue; //or break; would probably be better.
                    }

                    if (node1.Name == "title")
                    {
                        rssDC.Title = node1.InnerText;
                    }
                    else if (node1.Name == "link")
                    {
                        rssDC.Link = node1.InnerText;
                    }
                    else if(node1.Name == "guid")
                    {
                        rssDC.RSS_ID = node1.InnerText;
                    }
                    else if (node1.Name == "description")
                    {
                        rssDC.Description = node1.InnerText;
                    }
                    else if (node1.Name == "pubDate")
                    {
                        rssDC.DatePublished = node1.InnerText;
                    }

                    currentIterationIndex += 1;
                }
                rssDC = RssBAL.AddRssFeed(rssDC);


            }

        }

需要获得Rss Feed计数（即每站点5个Feed）

1 个答案: