将两个SyndicationFeeds [英] Combining two SyndicationFeeds

问题描述

什么是简单的方法来组合供稿和 feed2 ？我想从 feed2 添加到供稿的项目。此外，我想避免重复为供稿可能已经有项目时，一个问题是标签与WPF和Silverlight的。

 乌里feedUri =新的URI（http://stackoverflow.com/feeds/tag/silverlight）;
XmlReader的读者= XmlReader.Create（feedUri.AbsoluteUri）;
SyndicationFeed饲料= SyndicationFeed.Load（读卡器）;

乌里feed2Uri =新的URI（http://stackoverflow.com/feeds/tag/wpf）;
XmlReader的reader2 = XmlReader.Create（feed2Uri.AbsoluteUri）;
SyndicationFeed feed2 = SyndicationFeed.Load（reader2）;
 

解决方案

您可以使用LINQ简化code加入两个列表（不要忘记把System.Linq的你usings，如果必要的参考系统。核心项目中的）这里有一个主要的做工会，并将它们打印到控制台（与读写器进行适当的清理）。

 使用系统;
使用System.Collections.Generic;
使用System.Linq的;
使用System.Text;
使用的System.Xml;
使用System.ServiceModel.Syndication;

命名空间FeedUnion
{
    类节目
    {
        静态无效的主要（字串[] args）
        {
            乌里feedUri =新的URI（http://stackoverflow.com/feeds/tag/silverlight）;
            SyndicationFeed饲料;
            SyndicationFeed feed2;
            使用（XmlReader的读者= XmlReader.Create（feedUri.AbsoluteUri））
            {
                饲料= SyndicationFeed.Load（读卡器）;
            }
            乌里feed2Uri =新的URI（http://stackoverflow.com/feeds/tag/wpf）;
            使用（XmlReader的reader2 = XmlReader.Create（feed2Uri.AbsoluteUri））
            {
            feed2 = SyndicationFeed.Load（reader2）;
            }
            SyndicationFeed feed3 =新SyndicationFeed（feed.Items.Union（feed2.Items））;
            StringBuilder的建设者=新的StringBuilder（）;
            使用（XmlWriter的作家= XmlWriter.Create（制造商））
            {
                feed3.SaveAsRss20（作家）;
                System.Console.Write（builder.ToString（））;
                System.Console.Read（）;
            }
        }
    }
}
 

What's a simple way to combine feed and feed2? I want the items from feed2 to be added to feed. Also I want to avoid duplicates as feed might already have items when a question is tagged with both WPF and Silverlight.

Uri feedUri = new Uri("http://stackoverflow.com/feeds/tag/silverlight");
XmlReader reader = XmlReader.Create(feedUri.AbsoluteUri);
SyndicationFeed feed = SyndicationFeed.Load(reader);    

Uri feed2Uri = new Uri("http://stackoverflow.com/feeds/tag/wpf");
XmlReader reader2 = XmlReader.Create(feed2Uri.AbsoluteUri);
SyndicationFeed feed2 = SyndicationFeed.Load(reader2);

解决方案

You can use LINQ to simplify the code to join two lists (don't forget to put System.Linq in your usings and if necessary reference System.Core in your project) Here's a Main that does the union and prints them to console (with proper cleanup of the Reader).

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml;
using System.ServiceModel.Syndication;

namespace FeedUnion
{
    class Program
    {
        static void Main(string[] args)
        {
            Uri feedUri = new Uri("http://stackoverflow.com/feeds/tag/silverlight"); 
            SyndicationFeed feed;
            SyndicationFeed feed2;
            using(XmlReader reader = XmlReader.Create(feedUri.AbsoluteUri))
            {
                feed= SyndicationFeed.Load(reader); 
            }
            Uri feed2Uri = new Uri("http://stackoverflow.com/feeds/tag/wpf"); 
            using (XmlReader reader2 = XmlReader.Create(feed2Uri.AbsoluteUri))
            {
            feed2 = SyndicationFeed.Load(reader2);
            }
            SyndicationFeed feed3 = new SyndicationFeed(feed.Items.Union(feed2.Items));
            StringBuilder builder = new StringBuilder();
            using (XmlWriter writer = XmlWriter.Create(builder))
            {
                feed3.SaveAsRss20(writer);
                System.Console.Write(builder.ToString());
                System.Console.Read();
            }
        }
    }
}

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