Windows8商店应用的 通知 分为三种类型：
Badge（锁屏提醒）：通知锁屏提醒可传达有关应用或应用特定的摘要或状态信息。这些信息可以是数字 (1-99) 或 Windows 所提供的一组字形中的一个。
MSDN：http://msdn.microsoft.com/zh-cn/library/windows/apps/hh779719.aspx
示例代码：
1: void UpdateBadgeWithNumber(int number)
2: {
3: // Note: This sample contains an additional project, NotificationsExtensions.
4: // NotificationsExtensions exposes an object model for creating notifications, but you can also modify the xml
5: // of the notification directly. See the additional function UpdateBadgeWithNumberWithStringManipulation to see how to do it
6: // by modifying strings directly
7:
8: BadgeNumericNotificationContent badgeContent = new BadgeNumericNotificationContent((uint)number);
9:
10: // send the notification to the app's application tile
11: BadgeUpdateManager.CreateBadgeUpdaterForApplication().Update(badgeContent.CreateNotification());
12:
13:
14: }
Toast 通知：Toast 通知是在屏幕右上角（对于从右到左 (RTL) 方向的语言，则位于左上角）显示的通知，它让应用可以告知用户他/她是在另一个应用中、在“开始”屏幕上，还是在桌面上。
MSDN：http://msdn.microsoft.com/zh-cn/library/windows/apps/hh779727.aspx
示例代码：
1: string toastXmlString = String.Empty;
2: if (templateType == ToastTemplateType.ToastText01)
3: {
4: toastXmlString = "<toast>"
5: + "<visual version='1'>"
6: + "<binding template='ToastText01'>"
7: + "<text id='1'>Body text that wraps over three lines</text>"
8: + "</binding>"
9: + "</visual>"
10: + "</toast>";
11: }
12: else if (templateType == ToastTemplateType.ToastText02)
13: {
14: toastXmlString = "<toast>"
15: + "<visual version='1'>"
16: + "<binding template='ToastText02'>"
17: + "<text id='1'>Heading text</text>"
18: + "<text id='2'>Body text that wraps over two lines</text>"
19: + "</binding>"
20: + "</visual>"
21: + "</toast>";
22: }
23: else if (templateType == ToastTemplateType.ToastText03)
24: {
25: toastXmlString = "<toast>"
26: + "<visual version='1'>"
27: + "<binding template='ToastText03'>"
28: + "<text id='1'>Heading text that is very long and wraps over two lines</text>"
29: + "<text id='2'>Body text</text>"
30: + "</binding>"
31: + "</visual>"
32: + "</toast>";
33: }
34: else if (templateType == ToastTemplateType.ToastText04)
35: {
36: toastXmlString = "<toast>"
37: + "<visual version='1'>"
38: + "<binding template='ToastText04'>"
39: + "<text id='1'>Heading text</text>"
40: + "<text id='2'>First body text</text>"
41: + "<text id='3'>Second body text</text>"
42: + "</binding>"
43: + "</visual>"
44: + "</toast>";
45: }
46:
47: Windows.Data.Xml.Dom.XmlDocument toastDOM = new Windows.Data.Xml.Dom.XmlDocument();
48: toastDOM.LoadXml(toastXmlString);
Tile（辅助磁贴）：辅助磁贴使用户能够将 Windows 应用商店应用的特定内容和深层链接—对固定应用内部一个特定位置的引用—发送到“开始”屏幕上。辅助磁贴使用户能够使用好友、新闻源、股票报价和其他对其很重要的内容来个性化“开始”屏幕体验。
MSDN：http://msdn.microsoft.com/zh-cn/library/windows/apps/hh465372.aspx
示例代码：
1: // create a string with the tile template xml
2: string tileXmlString = "<tile>"
3: + "<visual>"
4: + "<binding template='TileWideImageAndText01'>"
5: + "<text id='1'>This tile notification uses ms-appx images</text>"
6: + "<image id='1' src='ms-appx:///images/redWide.png' alt='Red image'/>"
7: + "</binding>"
8: + "<binding template='TileSquareImage'>"
9: + "<image id='1' src='ms-appx:///images/graySquare.png' alt='Gray image'/>"
10: + "</binding>"
11: + "</visual>"
12: + "</tile>";
13:
14: // create a DOM
15: Windows.Data.Xml.Dom.XmlDocument tileDOM = new Windows.Data.Xml.Dom.XmlDocument();
16: // load the xml string into the DOM, catching any invalid xml characters
17: tileDOM.LoadXml(tileXmlString);
18:
19: // create a tile notification
20: TileNotification tile = new TileNotification(tileDOM);
21:
22: // send the notification to the app's application tile
23: TileUpdateManager.CreateTileUpdaterForApplication().Update(tile);
这里比较值得一提的是微软封装好的类库：NotificationsExtensions.rar 下面的2个示例都用到了它，大家可以好好研究下，学习微软是怎么封装类库的