如何在 WinUI 3 应用程序中单击仅 3 秒后禁用按钮？

Question

我有一个按钮，我想禁用它 3 秒钟，以免它被滥用。 我想添加一个Timer(3000); 在Click事件中，但是我发现的示例代码使用的是过时的方法并且无法正常工作。 我尝试了另一个代码（可以在下面找到）但是这抛出System.Runtime.InteropServices.COMException: 'The application called an interface that was marshalled for a different thread. (0x8001010E (RPC_E_WRONG_THREAD))' System.Runtime.InteropServices.COMException: 'The application called an interface that was marshalled for a different thread. (0x8001010E (RPC_E_WRONG_THREAD))'错误。

private void CodeButton_Click(object sender, RoutedEventArgs e)
{
    CodeButton.IsEnabled = false;
    var timer = new Timer(3000);
    timer.Elapsed += (timer_s, timer_e) =>
    {
            CodeButton.IsEnabled = true;
            timer.Dispose();

    };
    timer.Start();
    Launcher.LaunchUriAsync(new Uri("https://www.hoppie.nl/acars/system/register.html"));
}

Answer 1

您需要使用主线程（实例化 UI 组件的线程）来更新 UI。 你得到那个错误是因为计时器将与另一个线程一起工作，而不是主线程。

你可以这样做：

private async void Button_Click(object sender, RoutedEventArgs e)
{
    try
    {
        // You can update the UI because
        // the Click event will use the main thread.
        this.Button.IsEnabled = false;

        List<Task> tasks = new();
        // The main thread will be released here until
        // LaunchUriAsync returns.
        tasks.Add(Launcher.LaunchUriAsync(new Uri("https://www.hoppie.nl/acars/system/register.html")));
        tasks.Add(Task.Delay(3000));
        await Task.WhenAll(tasks);
        // The main thread will be back here.
    }
    finally
    {
        // This will enable the button even if you face exceptions.
        this.Button.IsEnabled = true;
    }
}