public SearchPage()
{
this.InitializeComponent();
this.Loaded += load_Handler;
snapSearchListView.LayoutUpdated += load_Handler;
this.NavigationCacheMode = Windows.UI.Xaml.Navigation.NavigationCacheMode.Enabled;
_searchViewModel = new ChannelSearchViewModel <ChannelSearchListInfo, HotSearchInfo>();
_searchViewModel.Items = new ObservableCollection <ChannelSearchListInfo>();
_searchViewModel.Navs = new ObservableCollection <TextBlock>();
this.DefaultViewModel["Items"] = _searchViewModel.Items;
searchCatalogComboBox.ItemsSource = _searchViewModel.Navs;
_channelFactory = new ChannelSearchFactory();
_channelFactory.HttpSucessHandler += channelFactory_HttpSucessed;
_channelFactory.HttpFailorTimeOut = channelFactory_HttpFailorTimeOut;
_hotSearchFactory = new HotSearchFactory();
_hotSearchFactory.HttpSucessHandler += hotSearchFactory_HttpSucessed;
_requestNum = ScreenUtils.CreateRequestNum(370, 160, 251);
}