Solution to trigger click by clicking button button multiple times at the same time in WPF
- 2021-09-16 06:42:53
- OfStack
Solve the button button in WPF to trigger click by clicking it several times at the same time. For your reference, the specific contents are as follows
DateTime lastClick = DateTime.Now;
object obj = new object();
int i = 0;
private void Button_Click(object sender, RoutedEventArgs e)
{
this.IsEnabled = false;
var t = (DateTime.Now - lastClick).TotalMilliseconds;
i++;
lastClick = DateTime.Now;
System.Diagnostics.Debug.Print(t + "," + i + ";" + DateTime.Now);
Thread.Sleep(2000);
this.IsEnabled = true;
}
The above code can't solve the problem that the user clicks the button twice to trigger twice, because the ui thread is single-threaded, so this will cause the user to click twice in succession, and then call Button_Click1 times after two seconds. The output is as follows:
1207.069, 1; April 19, 2017 13:58:22
2055.1176, 2; April 19, 2017 13:58:24
Therefore, this. IsEnabled = false; The interface is forced to refresh later, and the code is as follows:
private void Button_Click(object sender, RoutedEventArgs e)
{
this.IsEnabled = false;
DispatcherHelper.DoEvents();
var t = (DateTime.Now - lastClick).TotalMilliseconds;
i++;
lastClick = DateTime.Now;
System.Diagnostics.Debug.Print(t + "," + i + ";" + DateTime.Now);
Thread.Sleep(2000);
this.IsEnabled = true;
}
public static class DispatcherHelper
{
[SecurityPermissionAttribute(SecurityAction.Demand, Flags = SecurityPermissionFlag.UnmanagedCode)]
public static void DoEvents()
{
DispatcherFrame frame = new DispatcherFrame();
Dispatcher.CurrentDispatcher.BeginInvoke(DispatcherPriority.Background, new DispatcherOperationCallback(ExitFrames), frame);
try { Dispatcher.PushFrame(frame); }
catch (InvalidOperationException) { }
}
private static object ExitFrames(object frame)
{
((DispatcherFrame)frame).Continue = false;
return null;
}
}
DispatcherHelper. DoEvents (); This method will force the interface to refresh, and the problem will be solved.