我們昨日創建了MAUI的getAll和add Todo方法，我們今天來試著將我們的App加入update和delete的方法

		...

        [RelayCommand]
        public async void EditTodo(TodoItemModel todoItemModel)
        {
            var navParam = new Dictionary<string, object>();
            navParam.Add("TodoItem", todoItemModel);

            await AppShell.Current.GoToAsync(nameof(AddTodoPage), navParam);
        }

        [RelayCommand]
        public async void DeleteTodo(TodoItemModel todoItemModel)
        {
            var del = await _todoService.DeleteTodo(todoItemModel);
            if(del > 0) {
                GetTodoList();
            }
        }
    }
}

修改一下model，並在模擬器中刪除反安裝app
Todo\Models\TodoItemModel.cs

using SQLite;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Todo.Models
{
    public class TodoItemModel
    {
        [PrimaryKey, AutoIncrement]
        public int TodoId { get; set; }
        public string Title { get; set; }
        public bool IsDone { get; set; }
    }
}

加入按鈕並綁定
TodoPage.xaml

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:models="clr-namespace:Todo.Models"
             xmlns:viewModels="clr-namespace:Todo.ViewModels"
             x:DataType="viewModels:TodoListViewModel"
             x:Class="Todo.TodoPage"
             Title="TodoPage">
    <VerticalStackLayout Margin="10">
        <Label 
            Text="Welcome to .NET MAUI!"
            VerticalOptions="Center" 
            HorizontalOptions="Center" />
        <Button Text="Go to Add Page" Clicked="ButtonClicked"/>
        <CollectionView ItemsSource="{Binding Todos}">
            <CollectionView.ItemTemplate>
                <DataTemplate x:DataType="models:TodoItemModel">
                    <Frame>
                        <HorizontalStackLayout Spacing="10" HorizontalOptions="Center">
                            <Label Text="{Binding Title}" />
                            <CheckBox IsChecked="{Binding IsDone}"/>
                            <Button Text="Delete" 
                                    Command="{Binding Source={x:RelativeSource AncestorType={x:Type viewModels:TodoListViewModel}},Path=DeleteTodoCommand}" 
                                    CommandParameter="{Binding .}"/>
                            <Button Text="Edit" 
                                    Command="{Binding Source={x:RelativeSource AncestorType={x:Type viewModels:TodoListViewModel}},Path=EditTodoCommand}" 
                                    CommandParameter="{Binding .}"/>
                        </HorizontalStackLayout>
                    </Frame>
                </DataTemplate>
            </CollectionView.ItemTemplate>
        </CollectionView>
    </VerticalStackLayout>
</ContentPage>

(刪除後重安裝app會出現no sqlite在重啟一次就沒了，可能是我們的app初始化有問題，之後要修改)

這邊我們測試

今天簡單的實現刪除和編輯功能，明天我們接著來完善我們的Todo App