在 wpf C# 中显示 3/5 秒的标签，但单击几下后它不会停留那么久
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Showing a label for 3/5 seconds in wpf C# but after some click it doesn't stay that longer
提问by Deepu Reghunath
I'm trying to show text in a label in wpf when a button is pressed and then hide after couple of seconds. I know there are answers of this, but my problem is different.
我试图在按下按钮时在 wpf 的标签中显示文本，然后在几秒钟后隐藏。我知道这有答案，但我的问题是不同的。
I used these 2 ways for hiding the label:
我使用了这两种方法来隐藏标签：
One
一
//When the button is pressed
label_plus.Visibility = System.Windows.Visibility.Visible;
DispatcherTimer timer = new DispatcherTimer();
timer.Interval = new TimeSpan(0, 0, 5);
timer.Tick += timer_Tick; //Or, timer.Tick += new EventHandler(timer_Tick);
timer.Start();
// The timer event handler
void timer_Tick(object sender, EventArgs e)
{
label_plus.Visibility = System.Windows.Visibility.Collapsed;
}
Two
二
//Button pressed
label_plus.Content = label_plus1.Content = "+";
DispatcherTimer timer = new DispatcherTimer();
timer.Interval = new TimeSpan(0, 0, 5);
timer.Tick += (o, args) => label_plus.Content = "";
timer.Start();
Note: I the second one is almost same, except the "timer.tick += (o, args)" line. I got this code from: Here. It was a Form application code, so I just tried that part and it worked.
注意：我的第二个几乎相同，除了“timer.tick += (o, args)”这一行。我从这里得到了这个代码：这里。这是一个表单应用程序代码，所以我只是尝试了那部分并且它起作用了。
The 1st code I got directly from here.
The problem is this both works pretty well on 1st and second time.And maybe 3rd. But after that I feel like the timer second is decreasing. After 2/3 times, it hides within 3/4 seconds, after that it barely stays for 1 second or less.
问题是这在第一次和第二次都很好用。也许第三。但在那之后，我觉得计时器秒数正在减少。2/3 次后，它会在 3/4 秒内隐藏，之后几乎不会停留 1 秒或更短时间。
Is there a better way to do this or getting rid of this problem? I'm new in Visual Studio.
有没有更好的方法来做到这一点或摆脱这个问题？我是 Visual Studio 的新手。
Update:This also works well, but keeps repeating. Any way to stop after one process?
更新：这也很有效，但会不断重复。有什么办法可以在一个过程后停止？
var timer = new System.Timers.Timer();
timer.Elapsed += timer_Tick;
timer.Interval = 3000;
timer.Enabled = true;
timer.Start();
void timer_Tick(object sender, EventArgs e)
{
//label_plus.Visibility = label_plus1.Visibility = System.Windows.Visibility.Collapsed;
MessageBox.Show("Show some data");
}
Thanks in advance.
提前致谢。
回答by goobering
This works:
这有效：
XAML:
XAML：
<StackPanel>
<Button Width="50"
Height="50"
Click="Button_Click"
Content="OK" />
<Label x:Name="MyLabel"
Content="THIS IS A LABEL"
FontSize="30"
Visibility="Collapsed" />
</StackPanel>
Codebehind:
代码隐藏：
private DispatcherTimer dispatcherTimer;
public MainWindow()
{
InitializeComponent();
//Create a timer with interval of 2 secs
dispatcherTimer = new DispatcherTimer();
dispatcherTimer.Tick += new EventHandler(dispatcherTimer_Tick);
dispatcherTimer.Interval = new TimeSpan(0, 0, 2);
}
private void Button_Click(object sender, RoutedEventArgs e)
{
//Things which happen before the timer starts
MyLabel.Visibility = System.Windows.Visibility.Visible;
//Start the timer
dispatcherTimer.Start();
}
private void dispatcherTimer_Tick(object sender, EventArgs e)
{
//Things which happen after 1 timer interval
MessageBox.Show("Show some data");
MyLabel.Visibility = System.Windows.Visibility.Collapsed;
//Disable the timer
dispatcherTimer.IsEnabled = false;
}
回答by Deepu Reghunath
This will shows an "Error" label for 3 sec when you click on the button and the label will gets hide after 3 sec.
当您单击按钮时，这将显示“错误”标签 3 秒，标签将在 3 秒后隐藏。
XAML
XAML
<Window.Resources>
<Storyboard x:Key="sbHideAnimation" >
<DoubleAnimation Storyboard.TargetProperty="Opacity" From="1" To="1" Duration="0:0:3" /><!--label shows for 3 sec-->
<DoubleAnimation Storyboard.TargetProperty="Opacity" BeginTime="0:0:3" From="1" To="0" DecelerationRatio=".5" Duration="0:0:2" /><!--Fade out the label after 3 sec-->
</Storyboard>
</Window.Resources>
<Grid>
<Label x:Name="lblError" Content="Error" FontSize="20" HorizontalAlignment="Center" Opacity="0"/>
<Button Click="Button_Click" Content="Button" VerticalAlignment="Center" Width="100" />
</Grid>
Code behind(c#)
代码隐藏（c#）
using System.Windows;
using System.Windows.Media.Animation;
namespace WpfApplication1
{
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
}
private void Button_Click(object sender, RoutedEventArgs e)
{
Storyboard sb = Resources["sbHideAnimation"] as Storyboard;
sb.Begin(lblError);
}
}
}
You can adjust the time duration for showing the label by changing the value of attributes 'BeginTime' and 'Duration' in the Storyboard "sbHideAnimation"
您可以通过更改 Storyboard“sbHideAnimation”中的属性“BeginTime”和“Duration”的值来调整显示标签的持续时间
Output
输出
回答by BlindGarret
You could always approach it as a WPF animation. They tend to give better control over things like fading in and out as needed. There are a lot of different approaches to this problem, but S.L. gives a couple of good visibility animation examples here: Apply animation on WPF control visibility change
您始终可以将其视为 WPF 动画。他们倾向于更好地控制诸如根据需要淡入淡出之类的事情。有很多不同的方法可以解决这个问题，但是 SL 在这里给出了几个很好的可见性动画示例：Apply animation on WPF control visible change
