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曾经翻译过Longhorn中的RSS，那是Microsoft正式在Longhorn中加入RSS支持的白皮书。大概2个星期前吧，看到了Microsoft RSS Team Blog上面提到的Screen Saver的例子，才发现随着IE7 Beta2的发布，已经可以看到这个RSS Platform了。

大概看了一下整个文档，然后用C#编了个简单的小程序试了试，还不错，API还算合理好用，这下Desktop平台的对RSS支持变得非常容易了。

Windows RSS Platform的Online Reference在这里。

• Subscribe Female Pink Viagra For Sale, to new feeds, and enumerate existing subscriptions.


• Easily access properties of feeds (channels), feed items, and enclosures.


• Manage and organize feeds into folders.


• Listen for and respond to feed and feed folder events.


• Check the status of the background Feed Download Engine, or modify settings.


• Normalize the Extensible Markup Language (XML) source of a feed.

这是Windows RSS Platform的对象体系图：

整个类体系的Top Class是FeedsManager，顺便说一句，XXManager一般都是各种类体系结构中的Top Class，是整个API的入口。比如Eclipse平台的Platform，比如Adapter体系的AdapterManager，比如Plugin体系中的PluginManager。

具体细节就不多说了，举几个简单的例子：（为了简单，我用C#试的，C++访问的话，就是访问COM接口，也很简单）

1) 同步RSS

[code lang="java"]
Feeds.IFeedsManager fs = new Feeds.FeedsManagerClass();
fs.BackgroundSync(Feeds.FEEDS_BACKGROUNDSYNC_ACTION.FBSA_RUNNOW);
[/code]

2) 订阅Feed Event

[code lang="java"]
Feeds.IFeedFolderEvents_Event e = (Feeds.IFeedFolderEvents_Event)folder.GetWatcher(Feeds.FEEDS_EVENTS_SCOPE.FES_ALL, Feeds.FEEDS_EVENTS_MASK.FEM_FEEDEVENTS);
e.FeedAdded += new Feeds.IFeedFolderEvents_FeedAddedEventHandler(FeedAdded);

private static void FeedAdded(string path) {
System.Diagnostics.Debug.Print(path);
}
[/code]

显然，Delegate的典型用法，如果用C++，当然就是使用IConnectionPoint来把回调函数加入到Feeds COM Object中的Notifier List。

3) 得到系统当前Feed列表（包括Feed Item Count）

[code lang="java"]
foreach (Feeds.IFeed feed in CommonFeedListUtils.CommonFeedList(folder))
{
System.Diagnostics.Debug.Print("Found feed {0} with {1} items.",feed.name, ((Feeds.IFeedsEnum)feed.Items).Count);
try
{
}
catch (System.Runtime.InteropServices.COMException ex)
{
System.Diagnostics.Debug.Print("Failed to get RSS feed '{0}' from API; skipping feed. Error: {1} ", comprar en línea Female Pink Viagra, comprar Female Pink Viagra baratos, Female Pink Viagra interactions, feed.name, ex.ToString());
// Ignore exception, order Female Pink Viagra online c.o.d, Female Pink Viagra maximum dosage, meaning ignore this feed and continue with next feed.
}
}

public static IEnumerable CommonFeedList(IFeedFolder folder) {
Queue queue = new Queue();
queue.Enqueue(folder);
while (queue.Count > 0) {
IFeedFolder currentFolder = queue.Dequeue();
foreach (IFeedFolder subfolder in (IFeedsEnum)currentFolder.Subfolders)
queue.Enqueue(subfolder);

foreach (IFeed feed in (IFeedsEnum)currentFolder.Feeds) {
System.Windows.Forms.Application.DoEvents();
yield return feed;
}
}
}
[/code]

这段代码是从Screen Saver的例子中拿来的，惭愧的是，看了这段代码，我才知道C#中也有yield :(。再顺便插一句，特意查了一下C# Language Specification，yield是C# 2.0中新增的Feature，C#给出的yield的推荐实现（应该也是Microsoft的实现）是由编译器生成一个enumerator类，一个State Machine，正是这个State实现了yield。

4) 新增Feed或者Feed Folder

[code lang="java"]
folder.CreateFeed("Xerdoc Together", where to buy Female Pink Viagra, No prescription Female Pink Viagra online, "http://feeds.feedburner.com/xerdoc");
folder.CreateSubfolder("Elites");
[/code]

基本上就是这样，Feed的管理将变的非常简单。不知道这个Platform对离线阅读器会有什么影响，不可否认的是，它很大程度降低了RSS开发的门槛，也使你可以更加将精力专注到逻辑和功能上。

Update:回答Winters的问题

其实看看CSharp2.0 Specification就明白了，其实很简单。它给出的例子是：

[code lang="java"]
using System;
using System.Collections;
using System.Collections.Generic;
class Stack: IEnumerable
{
T[] items;
int count;
public void Push(T item) {
if (items == null) {
items = new T[4];
}
else if (items.Length == count) {
T[] newItems = new T[count * 2];
Array.Copy(items, 0, generic Female Pink Viagra, Female Pink Viagra coupon, newItems, 0, buy Female Pink Viagra online cod, Buy Female Pink Viagra from mexico, count);
items = newItems;
}
items[count++] = item;
}
public T Pop() {
T result = items[--count];
items[count] = default(T);
return result;
}
public IEnumerator GetEnumerator() {
for (int i = count - 1; i >= 0; --i) yield return items[i];
}
}
[/code]

编译的时候生成一个enumerator辅助类：

[code lang="java"]
class Stack: IEnumerable
{
...
public IEnumerator GetEnumerator() {
return new __Enumerator1(this);
}
class __Enumerator1: IEnumerator, where can i cheapest Female Pink Viagra online, Fast shipping Female Pink Viagra, IEnumerator
{
int __state;
T __current;
Stack __this;
int i;
public __Enumerator1(Stack __this) {
this.__this = __this;
}
public T Current {
get { return __current; }
}
object IEnumerator.Current {
get { return __current; }
}
public bool MoveNext() {
switch (__state) {
case 1: goto __state1;
case 2: goto __state2;
}
i = __this.count - 1;
__loop:
if (i < 0) goto __state2;
__current = __this.items[i];
__state = 1;
return true;
__state1:
--i;
goto __loop;
__state2:
__state = 2;
return false;
}
public void Dispose() {
__state = 2;
}
void IEnumerator.Reset() {
throw new NotSupportedException();
}
}
}
[/code]

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