MVVM example json parser

App.xaml

<Application x:Class="ExampleMVVM.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:local="clr-namespace:ExampleMVVM" >
    <Application.Resources>
         
    </Application.Resources>
</Application>

App.xaml.cs

using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Threading.Tasks;
using System.Windows;

namespace ExampleMVVM
{
    /// <summary>
    /// Interaction logic for App.xaml
    /// </summary>
    public partial class App : Application
    {
        protected override void OnStartup(StartupEventArgs e)
        {
            // composition root
            MainWindowModel model = new MainWindowModel(new JSONParser("foo.xml"));
            MainWindowViewModel viewModel = new MainWindowViewModel(model);
            MainWindow view = new MainWindow {DataContext = viewModel};
            base.OnStartup(e);
            view.ShowDialog();
        }
    }
}

IJSONParser.cs

namespace ExampleMVVM
{
    public interface IJSONParser
    {
        string GetSomeParam(string attributeName);
    }
}

JSONParser.cs

namespace ExampleMVVM
{
    using System;

    public class JSONParser : IJSONParser
    {
        public JSONParser(string fileName)
        {
            // ...
        }

        public string GetSomeParam(string attributeName)
        {
            return "baz";
        }
    }
}

MainWindow.xaml

<Window x:Class="ExampleMVVM.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:ExampleMVVM"
        mc:Ignorable="d"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <Label Content="{Binding SomeParsedText}" />
    </Grid>
</Window>

MainWindow.xaml.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace ExampleMVVM
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }
    }
}

MainWindowModel.cs

namespace ExampleMVVM
{
    public class MainWindowModel
    {
        public MainWindowModel(IJSONParser parser)
        {
            SomeParsedText = parser.GetSomeParam("SomeParam");
        }

        public string SomeParsedText { get; set; }
    }
}

MainWindowViewModel.cs

namespace ExampleMVVM
{
    public class MainWindowViewModel
    {
        private readonly MainWindowModel _model;

        public MainWindowViewModel(MainWindowModel model)
        {
            _model = model;
        }

        public string SomeParsedText => _model.SomeParsedText;
    }
}