private void Exit()
{
if (Connection.CurJudgingCnt != 0)
{
MessageBox.Show($"仍有 {Connection.CurJudgingCnt} 项评测任务正在进行，不能退出程序", "提示", MessageBoxButton.OK,
MessageBoxImage.Error);
return;
}
if (MessageBox.Show("退出程序后已连接的所有客户端将被断开，确定继续？", "提示",
MessageBoxButton.YesNo, MessageBoxImage.Question) == MessageBoxResult.No)
{
return;
}
_notifyIcon.Visible = false;
Connection.IsExited = true;
new Thread(() =>
{
Connection.LogoutAll();
Environment.Exit(0);
}).Start();
}
