Добавлены основные классы для MVVM, частично реализована страница входа.

src/Intersvyaz/App.xaml.cs

@@ -18,6 +18,7 @@ using SimpleInjector;
 using Intersvyaz.Views;
 using Intersvyaz.Net;
 using Intersvyaz.Core.Services;
+using Intersvyaz.ViewModels;
 
 namespace Intersvyaz
 {
@@ -121,6 +122,7 @@ namespace Intersvyaz
             var container = new Container();
             container.Register<IntersvyazClient>(Lifestyle.Singleton);
             container.Register<ISessionService, SessionService>(Lifestyle.Transient);
+            container.Register<LoginViewModel>(Lifestyle.Transient);
             return container;
         }
     }

src/Intersvyaz/Common/BindableBase.cs

@@ -0,0 +1,41 @@
+using System.ComponentModel;
+using System.Diagnostics;
+using System.Runtime.CompilerServices;
+
+namespace Intersvyaz.Common
+{
+    public class BindableBase : INotifyPropertyChanged
+    {
+        /// <summary>
+        /// Событие об изменении значения свойства.
+        /// </summary>
+        public event PropertyChangedEventHandler PropertyChanged;
+
+        /// <summary>
+        /// Установка значения в заднее поля свойства с вызовом события.
+        /// </summary>
+        /// <typeparam name="T">Тип значения.</typeparam>
+        /// <param name="back">Заднее поле свойства.</param>
+        /// <param name="value">Новое значение.</param>
+        /// <param name="propertyName">Имя свойства. (Необязательный параметр)</param>
+        /// <remarks>При компилиции, имя свойства будет автоматически заполнено.</remarks>
+        protected void SetProperty<T>(ref T back, T value, [CallerMemberName] string propertyName = null)
+        {
+            if (!Equals(back, value))
+            {
+                back = value;
+                OnPropertyChanged(propertyName);
+            }
+        }
+
+        /// <summary>
+        /// Вызов события об изменении
+        /// </summary>
+        /// <param name="propertyName">Имя свойства. (Необязательный параметр)</param>
+        /// <remarks>При компилиции, имя свойства будет автоматически заполнено.</remarks>
+        protected void OnPropertyChanged([CallerMemberName] string propertyName = null)
+        {
+            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
+        }
+    }
+}

src/Intersvyaz/Common/RelayCommand.cs

@@ -0,0 +1,56 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Input;
+
+namespace Intersvyaz.Common
+{
+    public class RelayCommand : ICommand
+    {
+        /// <summary>
+        /// Действие команды.
+        /// </summary>
+        private readonly Action<object> _execute;
+
+        /// <summary>
+        /// Действие проверки «можно ли исполнить команду?».
+        /// </summary>
+        private readonly Predicate<object> _canExecute = null;
+
+        /// <inheritdoc />
+        public event EventHandler CanExecuteChanged;
+
+        public RelayCommand(Action<object> execute)
+        {
+            _execute = execute;
+        }
+
+        public RelayCommand(Action<object> execute, Predicate<object> canExecute)
+        {
+            _execute = execute;
+            _canExecute = canExecute;
+        }
+
+        /// <inheritdoc />
+        public bool CanExecute(object parameter)
+        {
+            return _canExecute == null || _canExecute(parameter);
+        }
+
+        /// <inheritdoc />
+        public void Execute(object parameter)
+        {
+            _execute(parameter);
+        }
+
+        /// <summary>
+        /// Вызов события изменения состояния.
+        /// </summary>
+        public void RaiseCanExecuteChanged()
+        {
+            CanExecuteChanged?.Invoke(this, EventArgs.Empty);
+        }
+    }
+}

src/Intersvyaz/Intersvyaz.csproj

@@ -119,7 +119,10 @@
     <Compile Include="App.xaml.cs">
       <DependentUpon>App.xaml</DependentUpon>
     </Compile>
+    <Compile Include="Common\BindableBase.cs" />
+    <Compile Include="Common\RelayCommand.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
+    <Compile Include="ViewModels\LoginViewModel.cs" />
     <Compile Include="Views\LoginPage.xaml.cs">
       <DependentUpon>LoginPage.xaml</DependentUpon>
     </Compile>
@@ -131,6 +134,9 @@
     <None Include="Intersvyaz_TemporaryKey.pfx" />
   </ItemGroup>
   <ItemGroup>
+    <Content Include="Assets\IntersvyazLogo.png">
+      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+    </Content>
     <Content Include="Properties\Default.rd.xml" />
     <Content Include="Assets\LockScreenLogo.scale-200.png" />
     <Content Include="Assets\SplashScreen.scale-200.png" />

src/Intersvyaz/ViewModels/LoginViewModel.cs

@@ -0,0 +1,75 @@
+using Intersvyaz.Common;
+using Intersvyaz.Core.Services;
+using System.Diagnostics;
+
+namespace Intersvyaz.ViewModels
+{
+    public class LoginViewModel : BindableBase
+    {
+        /// <summary>
+        /// Сервис сессии пользователя.
+        /// </summary>
+        private readonly ISessionService _sessionService;
+        
+        /// <summary>
+        /// Заднее поле имени пользователя.
+        /// </summary>
+        private string _username;
+
+        /// <summary>
+        /// Заднее поле пароля пользователя.
+        /// </summary>
+        private string _password;
+
+        /// <summary>
+        /// Имя пользователя.
+        /// </summary>
+        public string Username
+        {
+            get => _username;
+            set
+            {
+                SetProperty(ref _username, value);
+                LoginCommand.RaiseCanExecuteChanged();
+            }
+        }
+
+        /// <summary>
+        /// Пароль пользователя.
+        /// </summary>
+        public string Password
+        {
+            get => _password;
+            set
+            {
+                SetProperty(ref _password, value);
+                LoginCommand.RaiseCanExecuteChanged();
+            }
+        }
+
+        /// <summary>
+        /// Команда входа.
+        /// </summary>
+        public RelayCommand LoginCommand { get; }
+
+        public LoginViewModel(ISessionService sessionService)
+        {
+            _sessionService = sessionService;
+            
+            LoginCommand = new RelayCommand(ExecuteLoginCommand, CanExecuteLoginCommand);
+            Username = Password = string.Empty;
+        }
+
+        private async void ExecuteLoginCommand(object _)
+        {
+            var sessionData = await _sessionService.GetSessionAsync(Username, Password);
+            
+            // TODO: Обработка данных об сессии
+        }
+
+        private bool CanExecuteLoginCommand(object _)
+        {
+            return !string.IsNullOrEmpty(Username) && !string.IsNullOrEmpty(Password);
+        }
+    }
+}

src/Intersvyaz/Views/LoginPage.xaml

@@ -6,9 +6,37 @@
     xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
     xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
     mc:Ignorable="d"
-    Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
+    Background="{ThemeResource ApplicationPageBackgroundThemeBrush}"
+    DataContext="{x:Bind ViewModel}">
 
-    <Grid>
-        <TextBlock Text="LoginPage" />
+    <Grid VerticalAlignment="Center"
+          Margin="10">
+        <Grid.RowDefinitions>
+            <RowDefinition Height="Auto" />
+            <RowDefinition Height="Auto" />
+            <RowDefinition Height="Auto" />
+            <RowDefinition Height="Auto" />
+        </Grid.RowDefinitions>
+
+        <Image Source="ms-appx:///Assets/IntersvyazLogo.png"
+               VerticalAlignment="Center"
+               Margin="0,0,0,10"
+               Height="64"
+               Grid.Row="0" />
+
+        <TextBox PlaceholderText="логин"
+                 Text="{Binding Username,Mode=TwoWay}"
+                 Margin="0,0,0,10"
+                 Grid.Row="1" />
+
+        <PasswordBox PlaceholderText="пароль"
+                     Password="{Binding Password,Mode=TwoWay}"
+                     Grid.Row="2" />
+
+        <Button Content="войти"
+                Command="{Binding LoginCommand}"
+                HorizontalAlignment="Stretch"
+                Margin="0,10,0,0"
+                Grid.Row="3" />
     </Grid>
 </Page>

src/Intersvyaz/Views/LoginPage.xaml.cs

@@ -1,34 +1,19 @@
-using System;
-using System.Collections.Generic;
-using System.IO;
-using System.Linq;
-using System.Runtime.InteropServices.WindowsRuntime;
-using Windows.Foundation;
-using Windows.Foundation.Collections;
-using Windows.UI.Xaml;
-using Windows.UI.Xaml.Controls;
-using Windows.UI.Xaml.Controls.Primitives;
-using Windows.UI.Xaml.Data;
-using Windows.UI.Xaml.Input;
-using Windows.UI.Xaml.Media;
-using Windows.UI.Xaml.Navigation;
-using Intersvyaz.Core.Services;
+using Windows.UI.Xaml.Controls;
+using Intersvyaz.ViewModels;
 
 namespace Intersvyaz.Views
 {
-    /// <summary>
-    /// Страница входа.
-    /// </summary>
     public sealed partial class LoginPage : Page
     {
-        private readonly ISessionService _sessionService;
+        /// <summary>
+        /// Модель представления страницы входа.
+        /// </summary>
+        public LoginViewModel ViewModel { get; }
 
         public LoginPage()
         {
             InitializeComponent();
-
-            // NOTE: Получение сервисов
-            _sessionService = App.Current.Services.GetInstance<ISessionService>();
+            ViewModel = App.Current.Services.GetInstance<LoginViewModel>();
         }
     }
 }