(#341) Corrections to tutorial code

Author: adrianhall

docs/tutorial/client/part-1.md

@@ -216,4 +216,4 @@ In the [next tutorial](./part-2.md), I'm going to talk about authenticating clie
 [todomvc]: https://github.com/CommunityToolkit/Datasync/tree/main/samples/todoapp-mvc
 [todoapp]: https://github.com/CommunityToolkit/Datasync/tree/main/samples/todoapp-tutorial
 [CommunityToolkit.MVVM]: https://learn.microsoft.com/en-us/dotnet/communitytoolkit/mvvm/
-[CommunityToolkit.Datasync.Client]: https://www.nuget.org/packages/CommunityToolkit.Datasync.Client#readme-body-tab
+[CommunityToolkit.Datasync.Client]: https://www.nuget.org/packages/CommunityToolkit.Datasync.Client#readme-body-tab

samples/todoapp-tutorial/ClientApp/App.xaml.cs

@@ -1,4 +1,4 @@
-using ClientApp.Interfaces;
+using ClientApp.Interfaces;
 using ClientApp.Services;
 using ClientApp.ViewModels;
 using Microsoft.Extensions.DependencyInjection;
@@ -29,7 +29,7 @@ private void InitializeApplication()
     {
         using IServiceScope scope = Services.CreateScope();
         IAppInitializer initializer = scope.ServiceProvider.GetRequiredService<IAppInitializer>();
-        initializer.Initialize();
+        _ = initializer.Initialize();
     }
 
     /// <summary>

samples/todoapp-tutorial/ClientApp/Converters/BooleanToImageConverter.cs

@@ -1,3 +1,7 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
 using System.Globalization;
 using System.Windows.Data;
 using System.Windows.Media.Imaging;

samples/todoapp-tutorial/ClientApp/MainWindow.xaml

@@ -1,4 +1,4 @@
-<Window x:Class="ClientApp.MainWindow"
+<Window x:Class="ClientApp.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"

samples/todoapp-tutorial/ClientApp/ViewModels/TodoListViewModel.cs

@@ -0,0 +1,85 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using ClientApp.Interfaces;
+using ClientApp.Models;
+using CommunityToolkit.Mvvm.ComponentModel;
+using CommunityToolkit.Mvvm.Input;
+using System.ComponentModel;
+
+namespace ClientApp.ViewModels;
+
+public partial class TodoListViewModel(ITodoService todoService, IAlertService alertService) : ObservableRecipient
+{
+    [ObservableProperty]
+    private bool isRefreshing;
+
+    [ObservableProperty]
+    private BindingList<TodoItem> items = [];
+
+    [ObservableProperty]
+    private string addItemTitle = string.Empty;
+
+    [RelayCommand]
+    public async Task AddItemAsync(CancellationToken cancellationToken = default)
+    {
+        try
+        {
+            var addition = await todoService.AddTodoItemAsync(AddItemTitle, cancellationToken);
+            Items.Add(addition);
+            AddItemTitle = string.Empty;
+        }
+        catch (Exception ex)
+        {
+            await alertService.ShowErrorAlertAsync("Error adding item", ex.Message);
+        }
+    }
+
+    [RelayCommand]
+    public async Task UpdateItemAsync(TodoItem item, CancellationToken cancellationToken = default)
+    {
+        try
+        {
+            TodoItem? storedItem = await todoService.GetTodoItemAsync(item.Id, cancellationToken);
+            if (storedItem is not null)
+            {
+                storedItem.IsComplete = !storedItem.IsComplete;
+                var replacedItem = await todoService.ReplaceTodoItemAsync(storedItem, cancellationToken);
+                var idx = Items.IndexOf(item);
+                Items[idx] = replacedItem;
+            }
+            else
+            {
+                await alertService.ShowErrorAlertAsync("Item not found", "The item was not found in the database.");
+            }
+        }
+        catch (Exception ex)
+        {
+            await alertService.ShowErrorAlertAsync("Error updating item", ex.Message);
+        }
+    }
+
+    [RelayCommand]
+    public async Task RefreshItemsAsync(CancellationToken cancellationToken = default)
+    {
+        try
+        {
+            IsRefreshing = true;
+            List<TodoItem> dbItems = await todoService.GetAllTodoItemsAsync(cancellationToken);
+            Items.Clear();
+            foreach (var dbItem in dbItems)
+            {
+                Items.Add(dbItem);
+            }
+        }
+        catch (Exception ex)
+        {
+            await alertService.ShowErrorAlertAsync("Error refreshing items", ex.Message);
+        }
+        finally
+        {
+            IsRefreshing = false;
+        }
+    }
+}