xaml语言建立首个win8 Metro应用，rss阅读器
本实例是来源msdn的Metro开发文档，按着解说一步步来理解的，修改了一点点，拿了博客园本人的博客作为RSS阅读，本实例用来学习还是可以的参考文档http://msdn.microsoft.com/zh-cn/library/windows/apps/br211380.aspx#Y909
先看允许结果
本例子主要有2个类文件和2个xaml文件
第一个类文件FeedData.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Collections.ObjectModel;
using System.Threading.Tasks;
using Windows.Web.Syndication;
using Windows.Globalization.DateTimeFormatting;
namespace sl
{
// FeedData
// Holds info for a single blog feed, including a list of blog posts (FeedItem)
public class FeedData
{
public string Title { get; set; }
public string Description { get; set; }
public DateTime PubDate { get; set; }
private List _Items = new List();
public List Items
{
get
{
return this._Items;
}
}
}
// FeedItem
// Holds info for a single blog post
public class FeedItem
{
public string Title { get; set; }
public string Author { get; set; }
public string Content { get; set; }
public DateTime PubDate { get; set; }
public Uri Link { get; set; }
}
// FeedDataSource
// Holds a collection of blog feeds (FeedData), and contains methods needed to
// retreive the feeds.
public class FeedDataSource
{
private ObservableCollection _Feeds = new ObservableCollection();
public ObservableCollection Feeds
{
get
{
return this._Feeds;
}
}
public async Task GetFeedsAsync()
{
Task feed1 =
GetFeedAsync(" http://feed.iyunv.com/blog/u/109818/rss");
this.Feeds.Add(await feed1);
}
private async Task GetFeedAsync(string feedUriString)
{
// using Windows.Web.Syndication;
SyndicationClient client = new SyndicationClient();
Uri feedUri = new Uri(feedUriString);
try
{
SyndicationFeed feed = await client.RetrieveFeedAsync(feedUri);
// This code is executed after RetrieveFeedAsync returns the SyndicationFeed.
// Process it and copy the data we want into our FeedData and FeedItem classes.
FeedData feedData = new FeedData();
feedData.Title = feed.Title.Text;
if (feed.Subtitle.Text != null)
{
feedData.Description = feed.Subtitle.Text;
}
// Use the date of the latest post as the last updated date.
feedData.PubDate = feed.Items.PublishedDate.DateTime;
foreach (SyndicationItem item in feed.Items)
{
FeedItem feedItem = new FeedItem();
feedItem.Title = item.Title.Text;
feedItem.PubDate = item.PublishedDate.DateTime;
feedItem.Author = item.Authors.Name.ToString();
// Handle the differences between RSS and Atom feeds.
if (feed.SourceFormat == SyndicationFormat.Atom10)
{
feedItem.Content = item.Content.Text;
feedItem.Link = new Uri("http://www.iyunv.com" + item.Id);
}
else if (feed.SourceFormat == SyndicationFormat.Rss20)
{
feedItem.Content = item.Summary.Text;
feedItem.Link = item.Links.Uri;
}
feedData.Items.Add(feedItem);
}
return feedData;
}
catch (Exception)
{
return null;
}
}
}
}
第2个类文件DateConverter.cs
主要负责数据的转换
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Collections.ObjectModel;
using System.Threading.Tasks;
using Windows.Web.Syndication;
using Windows.Globalization.DateTimeFormatting;
namespace sl
{
public class DateConverter : Windows.UI.Xaml.Data.IValueConverter
{
public object Convert(object value, Type targetType, object parameter, string culture)
{
if (value == null)
throw new ArgumentNullException("value", "Value cannot be null.");
if (!typeof(DateTime).Equals(value.GetType()))
throw new ArgumentException("Value must be of type DateTime.", "value");
DateTime dt = (DateTime)value;
if (parameter == null)
{
// Date "7/27/2011 9:30:59 AM" returns "7/27/2011"
return DateTimeFormatter.ShortDate.Format(dt);
}
else if ((string)parameter == "day")
{
// Date "7/27/2011 9:30:59 AM" returns "27"
DateTimeFormatter dateFormatter = new DateTimeFormatter("{day.integer(2)}");
return dateFormatter.Format(dt);
}
else if ((string)parameter == "month")
{
// Date "7/27/2011 9:30:59 AM" returns "JUL"
DateTimeFormatter dateFormatter = new DateTimeFormatter("{month.abbreviated(3)}");
return dateFormatter.Format(dt).ToUpper();
}
else if ((string)parameter == "year")
{
// Date "7/27/2011 9:30:59 AM" returns "2011"
DateTimeFormatter dateFormatter = new DateTimeFormatter("{year.full}");
return dateFormatter.Format(dt);
}
else
{
// Requested format is unknown. Return in the original format.
return dt.ToString();
}
}
public object ConvertBack(object value, Type targetType, object parameter, string culture)
{
string strValue = value as string;
DateTime resultDateTime;
if (DateTime.TryParse(strValue, out resultDateTime))
{
return resultDateTime;
}
return Windows.UI.Xaml.DependencyProperty.UnsetValue;
}
}
}
第一个界面文件BlankPage.xaml文件（包括两段代码）
xaml代码
C#代码
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using Windows.Foundation;
using Windows.Foundation.Collections;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Controls.Primitives;
using Windows.UI.Xaml.Data;
using Windows.UI.Xaml.Input;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Navigation;
using System.Collections.ObjectModel;
using System.Threading.Tasks;
using Windows.Web.Syndication;
using Windows.Globalization.DateTimeFormatting;
// The Blank Page item template is documented at http://go.microsoft.com/fwlink/?LinkId=234238
namespace sl
{
///
/// An empty page that can be used on its own or navigated to within a Frame.
///
public sealed partial class BlankPage : Page
{
public BlankPage()
{
this.InitializeComponent();
}
///
/// Invoked when this page is about to be displayed in a Frame.
///
/// Event data that describes how this page was reached.The Parameter
/// property is typically used to configure the page.
protected override async void OnNavigatedTo(NavigationEventArgs e)
{
FeedDataSource _feedDataSource = App.DataSource;
if (_feedDataSource.Feeds.Count == 0)
{
await _feedDataSource.GetFeedsAsync();
}
this.DataContext = (_feedDataSource.Feeds).First();
}
private void ItemListView_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
FeedItem feedItem = e.AddedItems as FeedItem;
if (feedItem != null)
{
// Navigate the WebView to the blog post content HTML string.
ContentView.NavigateToString(feedItem.Content);
}
}
}
}
第4个文件是App.xaml（包括2段代码）
xaml代码
C#代码
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using Windows.ApplicationModel;
using Windows.ApplicationModel.Activation;
using Windows.Foundation;
using Windows.Foundation.Collections;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Controls.Primitives;
using Windows.UI.Xaml.Data;
using Windows.UI.Xaml.Input;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Navigation;
using System.Collections.ObjectModel;
using System.Threading.Tasks;
using Windows.Web.Syndication;
using Windows.Globalization.DateTimeFormatting;
// The Blank Application template is documented at http://go.microsoft.com/fwlink/?LinkId=234227
namespace sl
{
///
/// Provides application-specific behavior to supplement the default Application class.
///
sealed partial class App : Application
{
///
/// Initializes the singleton application object.This is the first line of authored code
/// executed, and as such is the logical equivalent of main() or WinMain().
///
public static FeedDataSource DataSource;
public App()
{
this.InitializeComponent();
DataSource = new FeedDataSource();
}
///
/// Invoked when the application is launched normally by the end user.Other entry points
/// will be used when the application is launched to open a specific file, to display
/// search results, and so forth.
///
/// Details about the launch request and process.
protected override void OnLaunched(LaunchActivatedEventArgs args)
{
if (args.PreviousExecutionState == ApplicationExecutionState.Terminated)
{
//TODO: Load state from previously suspended application
}
// Create a Frame to act navigation context and navigate to the first page
var rootFrame = new Frame();
rootFrame.Navigate(typeof(BlankPage));
// Place the frame in the current Window and ensure that it is active
Window.Current.Content = rootFrame;
Window.Current.Activate();
}
///
/// Invoked when application execution is being suspended.Application state is saved
/// without knowing whether the application will be terminated or resumed with the contents
/// of memory still intact.
///
/// The source of the suspend request.
/// Details about the suspend request.
void OnSuspending(object sender, SuspendingEventArgs e)
{
//TODO: Save application state and stop any background activity
}
}
}
源于参考文档http://msdn.microsoft.com/zh-cn/library/windows/apps/br211380.aspx#Y909
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