Question

我希望我的TextBox间歇性地闪烁。

我有这个方法

private void abilitaAltroToken(int indiceRiga, Grid grid)
{
    UIElement element = grid.Children[indiceRiga];
    Label label = (Label)element;
    element = grid.Children[++indiceRiga];
    TextBox textBox = (TextBox)element;
    textBox.Background = Brushes.Blue;
    label.Background = Brushes.Blue;

    Thread.Sleep(1000);
    label.Background = Brushes.White;

    Thread.Sleep(1000);
    label.Background = Brushes.Blue;

    Thread.Sleep(1000);
    label.Background = Brushes.White;

    Thread.Sleep(1000);
    label.Background = Brushes.Blue;       
}

此代码不会返回错误，但不会发生闪烁。

Answer 1

首先，你不应该在主（UI）线程代码中放置Thread.Sleep，这会使UI线程进入休眠状态，并且你不会在UI上看到任何变化。

就个人而言，我会使用动画（在XAML中也是如此）和Triggers / VisualStates来实现你在这里尝试的东西。

但是，由于我对XAML的了解不多，以下是实现标签闪烁的程序代码：

var colorAnim = new ColorAnimationUsingKeyFrames()
{
    KeyFrames = new ColorKeyFrameCollection
            {
                new DiscreteColorKeyFrame(Colors.White, KeyTime.FromTimeSpan(TimeSpan.FromSeconds(0.5))),
                new DiscreteColorKeyFrame(Colors.Blue, KeyTime.FromTimeSpan(TimeSpan.FromSeconds(1))),
                new DiscreteColorKeyFrame(Colors.White, KeyTime.FromTimeSpan(TimeSpan.FromSeconds(1.5))),
                new DiscreteColorKeyFrame(Colors.Blue, KeyTime.FromTimeSpan(TimeSpan.FromSeconds(2))),
            }
};

var storyBoard = new Storyboard();

storyBoard.Children.Add(colorAnim);
Storyboard.SetTarget(storyBoard, label);
Storyboard.SetTargetProperty(storyBoard, new PropertyPath("(Background).(SolidColorBrush.Color)"));

storyBoard.Begin();

基本上，我从您的问题中翻译了以下代码段：

Thread.Sleep(1000);  
label.Background = Brushes.White;

Thread.Sleep(1000);  
label.Background = Brushes.Blue;

Thread.Sleep(1000);  
label.Background = Brushes.White;

Thread.Sleep(1000);  
label.Background = Brushes.Blue;

Answer 2

使用Timer对象

以下是示例代码

private static System.Timers.Timer aTimer;
private static bool blinkFlag;
private Label label;

private void abilitaAltroToken(int indiceRiga,Grid grid)
{
        UIElement element = grid.Children[indiceRiga];
        label = (Label)element;
        element = grid.Children[++indiceRiga];
        TextBox textBox = (TextBox)element;
        textBox.Background = Brushes.Blue;
        label.Background = Brushes.Blue;

    aTimer = new System.Timers.Timer(1000);

    aTimer.Elapsed += new ElapsedEventHandler(OnTimedEvent);

    // Set the Interval to 1 seconds (1000 milliseconds).
    aTimer.Interval = 1000;
    aTimer.Enabled = true;

}
private static void OnTimedEvent(object source, ElapsedEventArgs e)
{
   label.Background = (blinkFlag?Brushes.Blue:Brushes.White);
   blinkFlag=!blinkFlag;
   aTimer.Interval = 1000;
   aTimer.Enabled = true;
}

Answer 3

你不应该睡在“UI线程”中。我建议您尝试使用DispatcherTimer代替。有关详细信息，请参阅以下链接：http://msdn.microsoft.com/en-us/library/system.windows.threading.dispatchertimer%28v=vs.110%29.aspx

Answer 4

双击计时器工具箱或将计时器拖到表单中。添加以下代码：

private void timer1_Tick(object sender, EventArgs e)
{
    if (tickcolor) txtAno.BackColor = Color.Red;
    if (!tickcolor) txtAno.BackColor = Color.White;
    tickcolor = !tickcolor;
}

private void txtAno_KeyPress(object sender, KeyPressEventArgs e)
{
    timer1.Stop();
    txtAno.BackColor = Color.White;
}

在form_load事件中添加以下内容：

    timer1.Interval = 500;
    timer1.Start();

    txtAno.Focus();

声明变量：private bool tickcolor = true;

这将使文本框txtAno闪烁红色和白色。

C＃如何使TextBox闪烁

4 个答案: