public BlogHomePage() { this.InitializeComponent(); NavigationCacheMode = NavigationCacheMode.Required; BlogViewModel = new BlogViewModel(); BlogViewModel.OnLoadMoreStarted += count => LoadingProgressRing.IsActive = true; BlogViewModel.OnLoadMoreCompleted += count => LoadingProgressRing.IsActive = false; ReadRankBlogViewModel = new ReadRankBlogViewModel(); ReadRankBlogViewModel.OnLoadMoreStarted += count => LoadingProgressRing.IsActive = true; ReadRankBlogViewModel.OnLoadMoreCompleted += count => LoadingProgressRing.IsActive = false; RecommendBlogViewModel = new RecommendBlogViewModel(); RecommendBlogViewModel.OnLoadMoreStarted += count => LoadingProgressRing.IsActive = true; RecommendBlogViewModel.OnLoadMoreCompleted += count => LoadingProgressRing.IsActive = false; }