Presence.Desktop/App.axaml

@@ -2,7 +2,7 @@
              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
              x:Class="Presence.Desktop.App"
              xmlns:local="using:Presence.Desktop"
-             RequestedThemeVariant="Default">
+             RequestedThemeVariant="Light">
              <!-- "Default" ThemeVariant follows system theme variant. "Dark" or "Light" are other available options. -->
 
     <Application.DataTemplates>

Presence.Desktop/ViewModels/MainWindowViewModel.cs

@@ -1,10 +1,14 @@
 using domain.UseCase;
 using Presence.Desktop.Models;
 using System;
+using System.Reactive.Linq;
+using System.Reactive;
 using System.Linq;
 using ReactiveUI;
 using System.Collections.Generic;
 using System.Collections.ObjectModel;
+using System.Windows.Input;
+using System.Threading.Tasks;
 
 namespace Presence.Desktop.ViewModels
 {
@@ -33,17 +37,43 @@ namespace Presence.Desktop.ViewModels
             set => this.RaiseAndSetIfChanged(ref _students, value);
         }
 
+        public Interaction<Unit, string?> ShowOpenFileDialog;
+        private string? _selectedFile;
+        public string? SelectedFile
+        {
+            get => _selectedFile;
+            set => this.RaiseAndSetIfChanged(ref _selectedFile, value);
+        }
+
+        public ICommand OpenFileDialog { get; }
+
         public MainWindowViewModel()
         {
             _groupService = null;
             _groups = new();
             _students = new();
+            OpenFileDialog = ReactiveCommand.CreateFromTask(SelectFile);
         }
 
-        public MainWindowViewModel(IGroupUseCase gService, IGroupUseCase groupService, ObservableCollection<GroupPresenter> groups, ObservableCollection<StudentPresenter> students)
+        public MainWindowViewModel(IGroupUseCase gService)
         {
             _groupService = gService;
+            ShowOpenFileDialog = new Interaction<Unit, string?>();
+            OpenFileDialog = ReactiveCommand.CreateFromTask(SelectFile);
 
+            _students = new();
+
+            this.WhenAnyValue(vm => vm.SelectedGroupItem)
+                .Subscribe(_ =>
+                {
+                    RefreshGroups();
+                    SetStudents();
+                });
+        }
+
+        private void RefreshGroups()
+        {
+            groupPresenters.Clear();
             foreach (var item in _groupService.GetGroupsWithStudents())
             {
                 GroupPresenter groupPresenter = new GroupPresenter
@@ -67,11 +97,6 @@ namespace Presence.Desktop.ViewModels
             }
 
             _groups = new(groupPresenters);
-
-            _students = new();
-
-            this.WhenAnyValue(vm => vm.SelectedGroupItem)
-                .Subscribe(_ => SetStudents());
         }
 
         private void SetStudents()
@@ -85,5 +110,15 @@ namespace Presence.Desktop.ViewModels
                 Students.Add(student);
         }
 
+        private async Task SelectFile()
+        {
+            SelectedFile = await ShowOpenFileDialog.Handle(Unit.Default);
+
+            if (SelectedFile is object)
+            {
+
+            }
+        }
+
     }
 }

Presence.Desktop/Views/MainWindow.axaml

@@ -14,9 +14,6 @@
     </Design.DataContext>
 
     <DockPanel Background="Azure">
-        <StackPanel DockPanel.Dock="Bottom">
-            <TextBlock Text="List ↑" HorizontalAlignment="Center"/>
-        </StackPanel>
         <StackPanel
             Spacing="10"
             HorizontalAlignment="Center"
@@ -29,20 +26,22 @@
                     </DataTemplate>
                 </ComboBox.ItemTemplate>
             </ComboBox>
-            <ComboBox/>
+			<Button Width="140" HorizontalContentAlignment="Center" Content="Внести студентов" Command="{Binding OpenFileDialog}"/>
             <ComboBox/>
         </StackPanel>
         <Border>
-            <ListBox Background="Bisque" ItemsSource="{Binding Students}">
+            <ListBox ItemsSource="{Binding Students}">
                 <ListBox.ItemTemplate>
                     <DataTemplate>
                         <StackPanel Orientation="Horizontal">
-                            <TextBlock>
+							<TextBlock>
-                                <MultiBinding StringFormat="{}{0} {1} {2}">
+								<TextBlock.Text>
-									<Binding Path="LastName"/>
+                                    <MultiBinding StringFormat="{}{0} {1} {2}">
-									<Binding Path="FirstName"/>
+									    <Binding Path="LastName"/>
-									<Binding Path="Patronymic"/>
+									    <Binding Path="FirstName"/>
-                                </MultiBinding>
+									    <Binding Path="Patronymic"/>
+                                    </MultiBinding>
+								</TextBlock.Text>
                             </TextBlock>
                         </StackPanel>
                     </DataTemplate>

Presence.Desktop/Views/MainWindow.axaml.cs

@@ -1,12 +1,48 @@
 using Avalonia.Controls;
+using Avalonia.Markup.Xaml;
+using Avalonia.Platform.Storage;
+using Avalonia.ReactiveUI;
+using Presence.Desktop.ViewModels;
+using ReactiveUI;
+using System;
+using System.Linq;
+using System.Reactive;
+using System.Threading.Tasks;
 
 namespace Presence.Desktop.Views
 {
-    public partial class MainWindow : Window
+    public partial class MainWindow : ReactiveWindow<MainWindowViewModel>
     {
         public MainWindow()
         {
             InitializeComponent();
+
+            this.WhenActivated(action =>
+            {
+                action(ViewModel.ShowOpenFileDialog.RegisterHandler(ShowOpenFileDialogAsync));
+            });
         }
+
+        public static FilePickerFileType FileCsv { get; } = new("Comma-Separated Values")
+        {
+            Patterns = ["*.csv"],
+            AppleUniformTypeIdentifiers = ["public.comma-separated-values-text"],
+            MimeTypes = ["application/vnd.ms-excel", "text/csv"]
+        };
+
+        private async Task ShowOpenFileDialogAsync(InteractionContext<Unit, string?> interaction)
+        {
+            var topLevel = GetTopLevel(this);
+            FilePickerOpenOptions fpOptions = new FilePickerOpenOptions
+            {
+                AllowMultiple = false,
+                Title = "students csv",
+                FileTypeFilter = [FileCsv]
+            };
+            var storageFile = await topLevel.StorageProvider.OpenFilePickerAsync(fpOptions);
+
+            interaction.SetOutput(storageFile.First().Path.ToString());
+        }
+
     }
 }