這篇文章主要為大家詳細介紹了WPF中button按鈕同時點擊多次觸發click的解決方法,具有一定的參考價值,感興趣的小伙伴們可以參考一下
解決WPF中button按鈕同時點擊多次觸發click的方法,供大家參考,具體內容如下
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; }
以上代碼並沒法解決用戶點擊兩次按鈕觸發兩次的問題,因為ui線程是單線程的,所以這樣會導致使用者連續點擊兩次,會兩秒後又呼叫Button_Click一次,輸出如下:
1207.069,1;2017年4月19日13:58:22
2055.1176,2;2017年4月19日13:58:24
所以要在this.IsEnabled = false;後面強制介面刷新,程式碼如下:
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();這個方法會強制介面刷新,問題就解決了。
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