Windows Phone 7 网络编程之RSS阅读器

实现一个RSS阅读器，通过你输入的RSS地址来获取RSS的信息列表和查看RSS文章中的详细内容。RSS阅读器是使用了WebClient类来获取网络上的RSS的信息，然后再转化为自己定义好的RSS实体类对象的列表，最后绑定到页面上。

 
 


  
  
using System.Net;  

  
  
using System.Text.RegularExpressions;  

  
  
 

  
  
namespace WindowsPhone.Helpers  

  
  
{  

  
  
    /// <summary> 

  
  
    /// RSS对象类  

  
  
    /// </summary> 

  
  
    public class RssItem  

  
  
    {  

  
  
        /// <summary> 

  
  
        /// 初始化一个RSS目录  

  
  
        /// </summary> 

  
  
        /// <param name="title">标题</param> 

  
  
        /// <param name="summary">内容</param> 

  
  
        /// <param name="publishedDate">发表事件</param> 

  
  
        /// <param name="url">文章地址</param> 

  
  
        public RssItem(string title, string summary, string publishedDate, string url)  

  
  
        {  

  
  
            Title = title;  

  
  
            Summary = summary;  

  
  
            PublishedDate = publishedDate;  

  
  
            Url = url;  

  
  
 

  
  
            //解析html  

  
  
            PlainSummary = HttpUtility.HtmlDecode(Regex.Replace(summary, "<[^>]+?>", ""));  

  
  
        }  

  
  
 

  
  
        //标题  

  
  
        public string Title { get; set; }  

  
  
 

  
  
        //内容  

  
  
        public string Summary { get; set; }  

  
  
 

  
  
        //发表时间  

  
  
        public string PublishedDate { get; set; }  

  
  
 

  
  
        //文章地址  

  
  
        public string Url { get; set; }  

  
  
 

  
  
        //解析的文本内容  

  
  
        public string PlainSummary { get; set; }  

  
  
    }  

  
  
} 
 
 

RssService.cs

 
 


  
  
<phone:PhoneApplicationPage   

  
  
    x:Class="ReadRssItemsSample.MainPage" 

  
  
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 

  
  
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 

  
  
    xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone" 

  
  
    xmlns:shell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone" 

  
  
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 

  
  
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 

  
  
    mc:Ignorable="d" d:DesignWidth="480" d:DesignHeight="768" 

  
  
    FontFamily="{StaticResource PhoneFontFamilyNormal}" 

  
  
    FontSize="{StaticResource PhoneFontSizeNormal}" 

  
  
    Foreground="{StaticResource PhoneForegroundBrush}" 

  
  
    SupportedOrientations="Portrait" Orientation="Portrait" 

  
  
    shell:SystemTray.IsVisible="True"> 

  
  
 

  
  
    <Grid x:Name="LayoutRoot" Background="Transparent"> 

  
  
        <Grid.RowDefinitions> 

  
  
            <RowDefinition Height="Auto"/> 

  
  
            <RowDefinition Height="*"/> 

  
  
        </Grid.RowDefinitions> 

  
  
 

  
  
        <StackPanel x:Name="TitlePanel" Grid.Row="0" Margin="12,17,0,28"> 

  
  
            <TextBlock x:Name="ApplicationTitle" Text="RSS阅读器" Style="{StaticResource PhoneTextNormalStyle}"/> 

  
  
        </StackPanel> 

  
  
 

  
  
        <Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0"> 

  
  
            <Grid.RowDefinitions> 

  
  
                <RowDefinition Height="Auto" /> 

  
  
                <RowDefinition  Height="*"/> 

  
  
            </Grid.RowDefinitions> 

  
  
            <TextBlock FontSize="30" Grid.Row="1" Height="49" HorizontalAlignment="Left" Margin="0,6,0,0" Name="textBlock1" Text="RSS地址" VerticalAlignment="Top" Width="116" /> 

  
  
            <TextBox Grid.Row="1" Height="72" HorizontalAlignment="Left" Margin="107,0,0,0" Name="rssURL" Text="http://www.cnblogs.com/rss" VerticalAlignment="Top" Width="349" /> 

  
  
            <Button Content="加载 RSS" Click="Button_Click" Margin="-6,72,6,552" Grid.Row="1" /> 

  
  
            <ListBox x:Name="listbox" Grid.Row="1" SelectionChanged="OnSelectionChanged" Margin="0,150,6,-11"> 

  
  
                <ListBox.ItemTemplate  > 

  
  
                    <DataTemplate> 

  
  
                        <Grid> 

  
  
                            <Grid.RowDefinitions> 

  
  
                                <RowDefinition Height="Auto" /> 

  
  
                                <RowDefinition Height="Auto" /> 

  
  
                                <RowDefinition Height="60" /> 

  
  
                            </Grid.RowDefinitions> 

  
  
                            <TextBlock Grid.Row="0" Text="{Binding Title}" Foreground="Blue" /> 

  
  
                            <TextBlock Grid.Row="1" Text="{Binding PublishedDate}" Foreground="Green" /> 

  
  
                            <TextBlock Grid.Row="2" TextWrapping="Wrap" Text="{Binding PlainSummary}" /> 

  
  
                        </Grid> 

  
  
                    </DataTemplate> 

  
  
                </ListBox.ItemTemplate> 

  
  
            </ListBox> 

  
  
        </Grid> 

  
  
    </Grid> 

  
  
   

  
  
</phone:PhoneApplicationPage> 
 
 

（2） RSS页面展示

 
 


  
  
using System;  

  
  
using System.Collections.Generic;  

  
  
using System.IO;  

  
  
using System.Net;  

  
  
using System.ServiceModel.Syndication;  

  
  
using System.Xml;  

  
  
 

  
  
namespace WindowsPhone.Helpers  

  
  
{  

  
  
    /// <summary> 

  
  
    /// 获取网络RSS服务类  

  
  
    /// </summary> 

  
  
    public static class RssService  

  
  
    {  

  
  
          

  
  
        /// <summary> 

  
  
        /// 获取RSS目录列表  

  
  
        /// </summary> 

  
  
        /// <param name="rssFeed">RSS的网络地址</param> 

  
  
        /// <param name="onGetRssItemsCompleted">获取完成事件</param> 

  
  
        public static void GetRssItems(string rssFeed, Action<IEnumerable<RssItem>> onGetRssItemsCompleted = null, Action<Exception> onError = null, Action onFinally = null)  

  
  
        {  

  
  
            WebClient webClient = new WebClient();  

  
  
 

  
  
            //注册webClient读取完成事件  

  
  
            webClient.OpenReadCompleted += delegate(object sender, OpenReadCompletedEventArgs e)  

  
  
            {  

  
  
                try  

  
  
                {  

  
  
 

  
  
                    if (e.Error != null)  

  
  
                    {  

  
  
                        if (onError != null)  

  
  
                        {  

  
  
                            onError(e.Error);  

  
  
                        }  

  
  
                        return;  

  
  
                    }  

  
  
 

  
  
                    //将网络获取的信息转化成RSS实体类  

  
  
                    List<RssItem> rssItems = new List<RssItem>();  

  
  
                    Stream stream = e.Result;  

  
  
                    XmlReader response = XmlReader.Create(stream);  

  
  
                    SyndicationFeed feeds = SyndicationFeed.Load(response);  

  
  
                    foreach (SyndicationItem f in feeds.Items)  

  
  
                    {  

  
  
                        RssItem rssItem = new RssItem(f.Title.Text, f.Summary.Text, f.PublishDate.ToString(), f.Links[0].Uri.AbsoluteUri);  

  
  
                        rssItems.Add(rssItem);  

  
  
                    }  

  
  
 

  
  
                    //通知完成返回事件执行  

  
  
                    if (onGetRssItemsCompleted != null)  

  
  
                    {  

  
  
                        onGetRssItemsCompleted(rssItems);  

  
  
                    }  

  
  
                }  

  
  
                finally  

  
  
                {  

  
  
                    if (onFinally != null)  

  
  
                    {  

  
  
                        onFinally();  

  
  
                    }  

  
  
                }  

  
  
            };  

  
  
 

  
  
            webClient.OpenReadAsync(new Uri(rssFeed));  

  
  
        }  

  
  
    }  

  
  
} 
 
 

MainPage.xaml.cs

 
 


  
  
using System.Windows;  

  
  
using System.Windows.Controls;  

  
  
using Microsoft.Phone.Controls;  

  
  
using WindowsPhone.Helpers;  

  
  
 

  
  
namespace ReadRssItemsSample  

  
  
{  

  
  
    public partial class MainPage : PhoneApplicationPage  

  
  
    {  

  
  
        private  string WindowsPhoneBlogPosts = "";  

  
  
 

  
  
        public MainPage()  

  
  
        {  

  
  
            InitializeComponent();  

  
  
        }  

  
  
 

  
  
        private void Button_Click(object sender, RoutedEventArgs e)  

  
  
        {  

  
  
            if (rssURL.Text != "")  

  
  
            {  

  
  
                WindowsPhoneBlogPosts = rssURL.Text;  

  
  
            }  

  
  
            else  

  
  
            {  

  
  
                MessageBox.Show("请输入RSS地址！");  

  
  
                return;  

  
  
            }  

  
  
            //加载RSS列表  

  
  
            RssService.GetRssItems(  

  
  
                WindowsPhoneBlogPosts,  

  
  
                (items) => { listbox.ItemsSource = items; },  

  
  
                (exception) => { MessageBox.Show(exception.Message); },  

  
  
                null  

  
  
                );  

  
  
        }  

  
  
 

  
  
        //查看文章的详细内容  

  
  
        private void OnSelectionChanged(object sender, SelectionChangedEventArgs e)  

  
  
        {  

  
  
            if (listbox.SelectedItem == null)  

  
  
                return;  

  
  
 

  
  
            var template = (RssItem)listbox.SelectedItem;  

  
  
 

  
  
            MessageBox.Show(template.PlainSummary);  

  
  
 

  
  
            listbox.SelectedItem = null;  

  
  
        }  

  
  
 

  
  
    }  

  
  
} 
 
 

（3）程序运行的效果如下

本文转自linzheng 51CTO博客，原文链接:http://blog.51cto.com/linzheng/1078563