WPF 手机验证码 发送按钮倒计时 代码

        private async void SendButton_Click(object sender, RoutedEventArgs e)

        {

            var button = sender as Button;

            var text = button.Content.ToString();

            if (SendVerifyCodeCommand?.CanExecute(null) == true)

            {

                SendVerifyCodeCommand?.Execute(null);

            }

            button.IsEnabled = false;

            for (int i =  - ; i >= ; i--)

            {

                button.Content = $"{i} s";

                await Task.Delay(TimeSpan.FromSeconds());

            }

            button.IsEnabled = true;

            button.Content = text;

        }