void MainPage_Loaded(object sender, RoutedEventArgs e)
 {
     if (this.currentMain_ViewModel == null)
         this.currentMain_ViewModel = new MainPage_ViewModel();
     this.currentMain_ViewModel.LoadDefaultCatalogData();
     this.DataContext = currentMain_ViewModel;
 }
 public void DataColIsChanged_Test()
 {
     bool isPropertyChanged = false;
     MainPage_ViewModel currentViewModel = new MainPage_ViewModel();
     currentViewModel.PropertyChanged += (x, se) =>
     {
        if (currentViewModel.CatalogInfoCol.Count > 0)
            isPropertyChanged = true;
     };
     currentViewModel.CatalogInfoCol = new System.Collections.ObjectModel.ObservableCollection<CatalogInfor>()
     {
        new CatalogInfor(){CatalogTitle="ComplateTestChanged",CatalogComment="TestData"}
     };
     Assert.IsTrue(isPropertyChanged);
 }