[C#]Windows RSS Platform
Windows RSS Platform提供RSS訂閱清單、訂閱增減等功能，其RSS的訂閱資訊會整合在7.0以上的IE版本內。
開發時需將Microsoft Feeds 2.0 Object Library這個COM物件加入參考。
加入參考後需將Microsoft.Feeds.Interop命名空間加入，命名空間內含有開發所需要的類別，主要的類別有FeedManager、FeedFolder、Feed、與FeedItem等。FeedManager為主要的管理類別，具備有RootFolder屬性，指向RSS清單的根目錄。FeedFolder為訂閱節點目錄，可透過SubFolders瀏覽內含有子目錄，或是透過Feeds瀏覽所訂閱節點。Feed為訂閱的網站資訊，內含訂閱網站所提供的訂閱內容。FeedItem為訂閱內容，可取得其Title、發佈時間、RSS描述等資訊、與取得設定是否內容是否已讀取。
看到這裡可稍微參閱一下MSDN上的圖片，釐清其彼此間的關聯性並加深印象。
這邊以Windows RSS Platform實做一個簡單的RSS訂閱程式，完整程式範例如下：
using System;
using System.Drawing;
using System.Windows.Forms;
using Microsoft.Feeds.Interop;
namespace WindowsFormsApplication2
{
public partial class MainForm : Form
{
#region Var
private IFeedsManager _feedsManager;
private IFeedFolder _rootFolder;
#endregion
#region Property
public IFeedsManager m_FeedsManager
{
get
{
if (_feedsManager == null)
_feedsManager = new FeedsManagerClass();
return _feedsManager;
}
}
public IFeedFolder m_RootFolder
{
get
{
if (_rootFolder == null)
_rootFolder = (IFeedFolder)m_FeedsManager.RootFolder;
return _rootFolder;
}
}
#endregion
#region Constructor
public MainForm()
{
InitializeComponent();
}
#endregion
#region Private Method
private void SetFeedNodes()
{
treeView1.Nodes.Clear();
SetFeedNodes(treeView1.Nodes.Add("Feeds"), m_RootFolder);
}
private void SetFeedNodes(TreeNode parentnode, IFeedFolder folder)
{
if (folder.Subfolders != null)
{
foreach (IFeedFolder subfolder in (IFeedsEnum)folder.Subfolders)
{
SetFeedNodes(parentnode.Nodes.Add(subfolder.Name), subfolder);
}
}
if (folder.Feeds != null)
{
foreach (IFeed feed in (IFeedsEnum)folder.Feeds)
{
parentnode.Nodes.Add(feed.Name).Tag = feed;
}
}
}
#endregion
#region Event Process
private void Form1_Load(object sender, EventArgs e)
{
SetFeedNodes();
treeView1.ExpandAll();
}
private void treeView1_AfterSelect(object sender, TreeViewEventArgs e)
{
IFeed feed = e.Node.Tag as IFeed;
if (feed == null)
return;
listView1.Items.Clear();
webBrowser1.DocumentText = string.Empty;
var unreadFont = new Font(listView1.Font, FontStyle.Bold);
foreach (IFeedItem item in (IFeedsEnum)feed.Items)
{
listView1.Items.Add(new ListViewItem(new string[] { item.Title, item.PubDate.ToShortDateString() })
{
Font = (item.IsRead) ? listView1.Font : unreadFont,
Tag = item
});
}
}
private void listView1_SelectedIndexChanged(object sender, EventArgs e)
{
if (listView1.SelectedItems.Count == 0 || listView1.SelectedItems[0].Tag == null)
return;
ListViewItem li = listView1.SelectedItems[0];
IFeedItem item = li.Tag as IFeedItem;
if (item == null)
return;
item.IsRead = true;
li.Font = listView1.Font;
webBrowser1.DocumentText = item.Description;
if (webBrowser1.DocumentText.Length == 0)
webBrowser1.Navigate(item.Link);
}
private void toolStripLabel1_Click(object sender, EventArgs e)
{
FeedAddDialog dlg = new FeedAddDialog();
if (dlg.ShowDialog() == DialogResult.OK)
{
((IFeed)m_RootFolder.CreateFeed(dlg.FeedName, dlg.FeedURL)).AsyncDownload();
SetFeedNodes();
treeView1.ExpandAll();
}
}
private void toolStripLabel2_Click(object sender, EventArgs e)
{
SetFeedNodes();
treeView1.ExpandAll();
}
#endregion
}
}
運行結果如下：
Download