从 xamarin 中的列表视图中删除选定项目（使用 SQLite DB）

Question

我想删除一个选定的行，我不认为我的代码离我很远。目前，它会删除保存在 SQLite DB 上的列表视图中的所有行，这对于删除所有按钮非常有用，但我不希望这样。以下是我的代码：

 void SaveButton_Clicked(object sender, System.EventArgs e)
    {
        MainWindowViewModel APR = new MainWindowViewModel()
        {
            ProductName = proName.Text,
            TotalAPR = totAPR.Text,
            Total = tot.Text,
            Monthly = mon.Text
        };

            using (SQLiteConnection conn = new SQLiteConnection(App.FilePath))
        {
            conn.CreateTable<MainWindowViewModel>();
            int rowsAdded = conn.Insert(APR);
        }

        DisplayAlert("Saved!", "Your APR has been saved!", "OK");

        BindingContext = new MainWindowViewModel();

        OnAppearing();
    }


    void RemoveButton_Clicked(object sender, System.EventArgs e)
    {
        MainWindowViewModel APR = new MainWindowViewModel()
        {
            ProductName = proName.Text,
            TotalAPR = totAPR.Text,
            Total = tot.Text,
            Monthly = mon.Text
        };

        using (SQLiteConnection conn = new SQLiteConnection(App.FilePath))
        {
            conn.DeleteAll<MainWindowViewModel>();
            int rowsDeleted = conn.Delete(APR);
        }

        DisplayAlert("Deleted!", "This saved APR has been deleted!", "OK");

        BindingContext = new MainWindowViewModel();

        OnAppearing();
    }



    protected override void OnAppearing()
    {
        base.OnAppearing();
        using (SQLiteConnection conn = new SQLiteConnection(App.FilePath))
        {
            conn.CreateTable<MainWindowViewModel>();
            var APRS = conn.Table<MainWindowViewModel>().ToList();

            APRListView.ItemsSource = APRS;


        }
    }

我也试过了：

using (SQLiteConnection conn = new SQLiteConnection(App.FilePath))
        {
            conn.Delete<MainWindowViewModel>();
            int rowsDeleted = conn.Delete(APR);
        }

但我被告知根据 Intellisense 将其更改为 conn.DeleteALL。

Answer 1

// you do not need to create a new instance of your VM
var item = (MainWindowViewModel)APRListView.SelectedItem;

conn.Delete(item);