一个简易的 Windows Phone 7 RSS 阅读器

chaosxin

　　上次随笔写了一个简易的 Windows 8 RSS 阅读器，本次随笔将改写一个简易的 Windows Phone 7 RSS 阅读器
　　同样是先贴出运行截图，共两个页面。
　　主页MainPage.xaml截图：

　　详细页Detail.xaml截图：

　　上面详细内容的显示也是使用浏览器控件。
与win8 WebView 不同的是WP7的浏览器控件叫WebBrowser，另外win8 WebView中如果点击超链接的target不等于_self则会打开电脑上自带的浏览器，而WP7的WebBrowser没这个问题，但WebBrowser对中文的支持还有不完善的地方，我在代码注释中会提到。
　　下面就贴出代码
　　App.xaml 中加了一段自定义的资源：





WP7RSS阅读器
25





　　在App.xaml.cs中加了一个属性，用来页面间传递数据：



        ///
/// 要显示详细内容的RSS项
///
public static SyndicationItem RssItem { get; set; }
　　MainPage.xaml代码如下：


MainPage.xaml

















































　　MainPage.xaml.cs代码如下：


MainPage.xaml.cs


using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using Microsoft.Phone.Controls;
using System.ServiceModel.Syndication;
using System.IO;
using System.Xml;
namespace WP7RssReader
{
public partial class MainPage : PhoneApplicationPage
{
public MainPage()
{
InitializeComponent();
}
private void btnGetFeed_Click(object sender, RoutedEventArgs e)
{
string rssUrl = txtFeedUri.Text;
if (string.IsNullOrWhiteSpace(rssUrl))
{
txtMsg.Text = "RSS地址不能为空";
return;
}
Uri uri;
if (!Uri.TryCreate(rssUrl, UriKind.Absolute, out uri))
{
txtMsg.Text = "url错误";
return;
}
txtMsg.Text = "开始下载...";
btnGetFeed.IsEnabled = false;
WebClient webClient = new WebClient();
webClient.DownloadStringCompleted += webClient_DownloadStringCompleted;
webClient.DownloadStringAsync(uri);
}
void webClient_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e)
{
if (e.Error != null)
{
Deployment.Current.Dispatcher.BeginInvoke(() =>
{
txtMsg.Text = e.Error.Message;
});
}
else
{
this.State["feed"] = e.Result;
UpdateFeedList(e.Result);
}
txtMsg.Text = "下载完成";
btnGetFeed.IsEnabled = true;
}
protected override void OnNavigatedTo(System.Windows.Navigation.NavigationEventArgs e)
{
if (this.State.ContainsKey("feed"))
{
if (listTitle.Items.Count == 0)
{
UpdateFeedList(State["feed"] as string);
}
}
if (listTitle.SelectedItem != null)
{
listTitle.SelectedItem = null;
}
}
private void UpdateFeedList(string feedXML)
{
StringReader stringReader = new StringReader(feedXML);
XmlReader xmlReader = XmlReader.Create(stringReader);
SyndicationFeed feed = SyndicationFeed.Load(xmlReader);
Deployment.Current.Dispatcher.BeginInvoke(() =>
{
var title = feed.Title;
txtFeedTitle.Text = title != null ? title.Text : "(没有标题)";
txtCount.Text = feed.Items.Count().ToString();
listTitle.ItemsSource = feed.Items;
btnGetFeed.Content = "刷新RSS";
});
}
private void listTitle_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
if (listTitle.SelectedValue != null)
{
App.RssItem = (SyndicationItem)listTitle.SelectedItem;
NavigationService.Navigate(new Uri("/Detail.xaml", UriKind.Relative));
}
}
}
}
　　Detail.xaml代码如下：


Detail.xaml



























　　Detail.xaml.cs代码如下：


Detail.xaml.cs


using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Navigation;
using Microsoft.Phone.Controls;
using Microsoft.Phone.Shell;
using System.ServiceModel.Syndication;
using System.IO;
using System.Text;
namespace WP7RssReader
{
public partial class Detail : PhoneApplicationPage
{
public Detail()
{
InitializeComponent();
}
protected override void OnNavigatedTo(NavigationEventArgs e)
{
var item = App.RssItem;
txtTitle.Text = item.Title.Text;
var authors = item.Authors;
StringBuilder sb = new StringBuilder();
sb.Append("作者：");
foreach (var author in authors)
{
sb.Append(author.Name + " ");
}
sb.Remove(sb.Length - 1, 1);
txtAuthor.Text = sb.ToString();
string content = "(没有内容)";
if (item.Content != null)
{
content = ((TextSyndicationContent)item.Content).Text;
}
else if (item.Summary != null)
{
content = item.Summary.Text;
}
content = ConvertExtendedAscii(content);
WebBrowser1.NavigateToString(content);
}
///
/// 解决乱码问题，将编码大于127的字符转换成HTML的字符实体
///
///
///
private static string ConvertExtendedAscii(string html)
{
StringBuilder sb = new StringBuilder();
foreach (var c in html)
{
int charInt = Convert.ToInt32(c);
if (charInt > 127)
sb.AppendFormat("&#{0};", charInt);//&#entity_number;
else
sb.Append(c);
}
return sb.ToString();
}
}
}
　　解决方案打包下载：WP7RssReader.zip