一个简易的 Windows 8 RSS 阅读器

先上运行截图：

简单说明：右侧主要内容的显示使用了浏览器控件WebView，另外，一些说明放在了代码注释中。

本应用只有一张页面MainPage

前台代码如下：

<Page
    x:Class="Win8RssReader.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:Win8RssReader"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d">
    <Page.Resources>
        <Style TargetType="TextBlock">
            <Setter Property="FontSize" Value="20"/>
            <Setter Property="IsTextSelectionEnabled" Value="True"/>
            <Setter Property="VerticalAlignment" Value="Center"/>
        </Style>
        <GridLength x:Key="height1">30</GridLength>
    </Page.Resources>

    <Grid Background="{StaticResource ApplicationPageBackgroundThemeBrush}">
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="300"/>
            <ColumnDefinition Width="*"/>
        </Grid.ColumnDefinitions>
        <Grid>
            <Grid.RowDefinitions>
                <RowDefinition Height="{StaticResource height1}"/>
                <RowDefinition Height="50"/>
                <RowDefinition Height="{StaticResource height1}"/>
                <RowDefinition Height="{StaticResource height1}"/>
                <RowDefinition Height="{StaticResource height1}"/>
                <RowDefinition Height="*"/>
            </Grid.RowDefinitions>
            <TextBox x:Name="txtFeedUri" Width="300" Text="http://www.cnblogs.com/rss"/>
            <Button x:Name="btnGetFeed" Content="加载RSS" Click="btnGetFeed_Click" Grid.Row="1"/>
            <StackPanel Orientation="Horizontal" Grid.Row="2">
                <TextBlock Text="提示信息："/>
                <TextBlock x:Name="txtMsg" Text="暂无" />
            </StackPanel>
            <StackPanel Orientation="Horizontal" Grid.Row="3">
                <TextBlock Text="RSS标题："/>
                <TextBlock x:Name="txtFeedTitle" Text="暂无" />
            </StackPanel>
            <StackPanel Orientation="Horizontal" Grid.Row="4">
                <TextBlock Text="内容条数："/>
                <TextBlock x:Name="txtCount" Text="暂无" />
            </StackPanel>
            <ListBox x:Name="listTitle" SelectionChanged="listTitle_SelectionChanged" Grid.Row="5">
                <ListBox.ItemTemplate>
                    <DataTemplate>
                        <TextBlock Text="{Binding Title.Text}" TextWrapping="Wrap"/>
                    </DataTemplate>
                </ListBox.ItemTemplate>
            </ListBox>
        </Grid>
        <Grid Grid.Column="1">
            <Grid.RowDefinitions>
                <RowDefinition Height="{StaticResource height1}"/>
                <RowDefinition Height="*"/>
            </Grid.RowDefinitions>
            <TextBlock x:Name="txtItemTitle" HorizontalAlignment="Center"/>
            <WebView x:Name="webViewContent" Grid.Row="1"/>
        </Grid>
    </Grid>
</Page>

后台代码如下：

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading.Tasks;
using Windows.Foundation;
using Windows.Foundation.Collections;
using Windows.Storage;
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 Windows.Web.Syndication;

namespace Win8RssReader
{
    public sealed partial class MainPage : Page
    {
        SyndicationClient syndicationClient;
        SyndicationFeed currentFeed;

        /// <summary>
        /// WebView在打开target="_blank"的超链接时会打开电脑上的浏览器，为了避免这种情况，这段js可通过更改DOM，使所有超链接的target="_self"。
        /// </summary>
        string MyJs { get; set; }

        public MainPage()
        {
            this.InitializeComponent();
        }

        async protected override void OnNavigatedTo(NavigationEventArgs e)
        {
            MyJs = await GetMyJs();
        }

        private async Task<string> GetMyJs()
        {
            StorageFile jsFile = await StorageFile.GetFileFromApplicationUriAsync(new Uri("ms-appx:///js.txt"));
            string jsText = await FileIO.ReadTextAsync(jsFile);
            return jsText;
        }

        private async void btnGetFeed_Click(object sender, RoutedEventArgs e)
        {
            string feedUriString = txtFeedUri.Text;
            await GetFeedAsync(feedUriString);
            DisplayFeed();
        }

        private async Task GetFeedAsync(string feedUriString)
        {
            Uri uri;
            if (!Uri.TryCreate(feedUriString.Trim(), UriKind.Absolute, out uri))
            {
                txtMsg.Text = "url错误";
                return;
            }
            if (syndicationClient == null)
            {
                syndicationClient = new SyndicationClient();
            }
            syndicationClient.BypassCacheOnRetrieve = true;
            syndicationClient.SetRequestHeader("User-Agent", "Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; WOW64; Trident/6.0)");
            txtMsg.Text = "开始下载...";
            try
            {
                currentFeed = await syndicationClient.RetrieveFeedAsync(uri);
                txtMsg.Text = "下载完成";
            }
            catch (Exception ex)
            {
                txtMsg.Text = ex.Message;
            }
        }

        private void DisplayFeed()
        {
            if (currentFeed != null)
            {
                ISyndicationText title = currentFeed.Title;
                txtFeedTitle.Text = title != null ? title.Text : "(没有标题)";
                txtCount.Text = currentFeed.Items.Count.ToString();
                listTitle.ItemsSource = currentFeed.Items;
                listTitle.SelectedIndex = 0;//选中第0条，触发SelectionChanged事件。
            }
        }

        private void listTitle_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            var item = (SyndicationItem)listTitle.SelectedValue;
            DisplayCurrentItem(item);
        }

        private void DisplayCurrentItem(SyndicationItem item)
        {
            if (item != null)
            {
                txtItemTitle.Text = item.Title != null ? item.Title.Text : "(没有标题)";
                string content = "(没有内容)";
                if (item.Content != null)
                {
                    content = item.Content.Text;
                }
                else if (item.Summary != null)
                {
                    content = item.Summary.Text;
                }
                content += MyJs;
                webViewContent.NavigateToString(content);
            }
        }
    }
}

引用文件js.txt中的内容如下：

<script type="text/javascript">
//WebView在打开target="_blank"的超链接时会打开电脑上的浏览器，为了避免这种情况，这段js可通过更改DOM，使所有超链接的target="_self"。
    var links = document.getElementsByTagName("a");
    for (var i = 0; i < links.length; i++) {
        links[i].target = "_self";
    }
</script>

解决方案打包下载 Win8RssReader.rar

题外话：

感觉现在做Windows Store App开发的很少哦，真心希望能和感兴趣的朋友们交流交流。

欢迎留言 ^_^