c# - 加载只出现在代码执行结束时

Question

我有一个按钮可以从 sqlite 表中删除记录。我试图放置加载屏幕，但它只出现在最后。你能帮帮我吗？

btnImportar.Click += delegate
{
    UserDialogs.Instance.ShowLoading("Aguarde...", MaskType.Black);

    string stm = "DELETE FROM Trender";

    using (SqliteCommand cmd2 = new SqliteCommand(stm, con))
    {
        cmd2.ExecuteNonQuery();
    }
}

Answer 1

我认为您阻止了 UI 线程的更新。做类似的事情，

UserDialogs.Instance.ShowLoading("Aguarde...", MaskType.Black);

ThreadPool.QueueUserWorkItem(_ => {
    string stm = "DELETE FROM Trender";

    using (SqliteCommand cmd2 = new SqliteCommand(stm, con))
    {
        cmd2.ExecuteNonQuery();
    }

    Activity.RunOnUiThread(() => {
        // Dismiss the dialog
    })
})