private async Task Logout()
{
var hiddenDaV = new DoubleAnimation(1, 0, new Duration(TimeSpan.FromSeconds(0.5)));
var showDaV = new DoubleAnimation(0, 1, new Duration(TimeSpan.FromSeconds(0.5)));
var unscratchWidthDaV = new DoubleAnimation(673, 473, new Duration(TimeSpan.FromSeconds(0.25)));
var unscratchHeightDaV = new DoubleAnimation(328, 228, new Duration(TimeSpan.FromSeconds(0.25)));
UserName.Text = Connection.Logout();
UpdateListBoxContent($"{DateTime.Now:yyyy/MM/dd HH:mm:ss} {UserName.Text} 在服务端注销", null, false);
await Dispatcher.BeginInvoke(new Action(() =>
{
LoginGrid.Visibility = Visibility.Visible;
ContentGrid.Visibility = Visibility.Hidden;
Operations.Items.Clear();
}));
ContentGrid.BeginAnimation(OpacityProperty, hiddenDaV);
BeginAnimation(WidthProperty, unscratchWidthDaV);
await Task.Run(() => { Thread.Sleep(300); });
BeginAnimation(HeightProperty, unscratchHeightDaV);
LoginGrid.BeginAnimation(OpacityProperty, showDaV);
}