C#如何眨眼TextBox

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，但不会闪烁。

Answer 1

首先，您不应该将Thread.Sleep放在您的主( UI )线程代码中，这会使UI线程进入睡眠状态，并且您不会看到UI上发生的任何更改。

就我个人而言，我将使用动画(在XAML中也是如此)和触发器/VisualState来实现您在这里尝试的内容。

但是，由于我对您的XAML了解不多，下面是实现标签闪烁的过程代码：

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片段：

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，

下面是一个示例代码

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

你不应该在"UI-thread“中休眠。我建议您尝试使用DispatcherTimer。有关更多信息，请参阅以下链接：http://msdn.microsoft.com/en-us/library/system.windows.threading.dispatchertimer%28v=vs.110%29.aspx