无法创建没有列错误的表Xamarin SQLite

Question

我正在尝试在Xamarin应用程序中使用本地SQLite数据库，我一直在关注本教程：https://docs.microsoft.com/en-us/xamarin/get-started/tutorials/local-database/?tabs=vswin

加载我正在对其进行测试的ListView页面时，总是会收到错误：System.AggregateException：'发生了一个或多个错误。（无法创建没有列的表（“ TestApp1.Piece”是否具有公共属性？））

这里是适用的代码：

Piece.cs

namespace TestApp1

    public class Piece
    
        [PrimaryKey, AutoIncrement]
        public int ID  get; set; 
        public int PartNum  get; set; 
        public string Catagory  get; set; 
        public string Url  get; set;

PieceDatabase.cs

namespace TestApp1

    public class PieceDatabase
    
        readonly SQLiteAsyncConnection _database;

        public PieceDatabase(string dbPath)
        
            _database = new SQLiteAsyncConnection(dbPath);
            _database.CreateTableAsync<Piece>().Wait();
        

        public Task<List<Piece>> GetPieceAsync()
        
            return _database.Table<Piece>().ToListAsync();
        

        public Task<int> SavePieceAsync(Piece temp)
        
            return _database.InsertAsync(temp);

App.xaml.cs

namespace TestApp1

    public partial class App : Application
    

        static PieceDatabase database;

        public static PieceDatabase PieceDatabase
        
            get
            
                if (database == null)
                
                    database = new PieceDatabase(Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData), "pieces.db3"));
                
                return database;
            
        

        public App()
        
            InitializeComponent();
            MainPage = new NavigationPage(new Page1());
        

        protected override void OnStart()
        
            // Handle when your app starts
        

        protected override void OnSleep()
        
            // Handle when your app sleeps
        

        protected override void OnResume()
        
            // Handle when your app resumes

DatabaseTest.xaml.cs

namespace TestApp1

    [XamlCompilation(XamlCompilationOptions.Compile)]
    public partial class DatabaseTest : ContentPage
    

        protected override async void OnAppearing()
        
            base.OnAppearing();

            /** The error does not occur if I add a piece here, but I'm trying to figure out why that is
            await App.PieceDatabase.SavePieceAsync(new Piece
            
                Catagory = "Beams",
                PartNum = 1,
                Url = "whatever.com"
            ); */

            List<Piece> test = await App.PieceDatabase.GetPieceAsync();
            listView.ItemsSource = test;
        

        public DatabaseTest()
        
            InitializeComponent();

        

        async void Handle_ItemTapped(object sender, ItemTappedEventArgs e)
        
            if (e.Item == null)
                return;

            await DisplayAlert("Item Tapped", "An item was tapped.", "OK");

            //Deselect Item
            ((ListView)sender).SelectedItem = null;

DatabaseTest.xaml

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:d="http://xamarin.com/schemas/2014/forms/design"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
             mc:Ignorable="d"
             x:Class="TestApp1.DatabaseTest">
    <StackLayout Margin="20,35,20,20">
        <ListView x:Name="listView">
            <ListView.ItemTemplate>
                <DataTemplate>
                    <TextCell Text="Binding PartNum"
                              Detail="Binding Url"
                              />
                </DataTemplate>
            </ListView.ItemTemplate>

        </ListView>
    </StackLayout>
</ContentPage>

这是我第一次与Xamarin合作，因此感谢您的帮助或解释。