独立缓存问题
var store = IsolatedStorageFile.GetUserStoreForApplication()
我用try-catch 捕获到 初始化失败

[解决办法]
参考一下这篇文章
http://www.codegain.com/index.php?option=com_content&view=article&id=286

http://www.switchonthecode.com/tutorials/silverlight-tutorial-using-isolated-storage