XAML-bound single-pole MVVM object

Question

NOTES

I'm a newbie, sometimes I get hung up on simple and / or stupid thoughts, this is one of them.

I get a general idea about data binding, I went through some of the training programs on the network and earned within a few hours through a lot and a lot of text, which only confused me a little.

PROBLEM

I am working on a Windows Phone 8 C # / XAML.NET 4.5 Application .

Using the web service provided to me in several ways, I upload the data that I need to view (sometimes in different combinations), and I need to store most of them for the duration of the application launch.

• For this purpose, I created ViewModel + several models and structured them as follows:

  MainViewModel
  --------------
  |
  + several properties (Username, Password, etc...)
  |
  + Commands (loadData1, loadData2, flush, ...  - implementations of ICommand)
  |
  + ------ PersonalInfoModel
  |        -----------------
  |        + several properties (name, surname, phonenumber, etc...)
  |
  |             
  + ------ DataGroup1Model
  |        ---------------
  |        +several properties
  |        +ObservableCollection<Item1> (roughly 0 - 50 items)
  |        +ObservableCollection<Item2> (roughly 0 - 5 items)
  |        +ObservableCollection<string> (roughly 0 - 5 items)
  |        
  |                  Item1                         Item2
  |                  -----                         -----
  |                  +several properties           +several other properties
  |                  
  |
  + ------ DataGroup2Model (similar to previous)
  ...et cetera...
  

  ViewModel ( ), , , ( / ).

  ---

• MainViewModel App.xaml.cs :

  private static MainViewModel viewModel = null;
  public static MainViewModel ViewModel
  {
      get
      {
          if (viewModel == null)
          {
              viewModel = new MainViewModel();
          }
          return viewModel;
      }
  }
  

  . , MVVM / -, ViewModel , . , .

  ---

• viewModel, /datacontext XAML

• ?

• itemSource listBox/longListSelector Text , , PersonalInfoModel MainViewModel, ?

P.S.: , . , , - , , " , ".

Answer 1

, , : View ViewModel? , , MVVM MVVM.

: ViewModel, , View DataContext. XAML, Microsoft DataContext , WP:

codebehind :

DataContext = App.MainViewModel;

, , -

WPF, WP8, .

, , :

<TextBlock Text="{Binding PersonalInfoModel.Name}" />