Shah Newaj Shah Newaj - 2 years ago 97
C# Question

Showing a label for 3/5 seconds in wpf C# but after some click it doesn't stay that longer

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.

I used these 2 ways for hiding the label:


One


//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


//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.

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.

Is there a better way to do this or getting rid of this problem?
I'm new in Visual Studio.

Update:
This also works well, but keeps repeating. Any way to stop after one process?

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.

Answer Source

This works:

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:

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;
}
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