问题
I haven't been able to find an explanation, or think of a reason why it's not available in non-OOB apps. So why is the toast notification only available in OOB apps?
回答1:
Silverlight 4 Out-Of-Browser apps can operate in full trust. This is necessary to open a window separate from the primary window. Toast notifications are separate windows.
来源：https://stackoverflow.com/questions/6684366/why-is-silverlight-toast-notification-only-available-in-oob-app