![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
System.Threading.Tasks.Task.Factory.StartNew(() =>
System.Windows.Forms.MessageBox.Show(string.Format("用户{0} [{1}]上线", user.userName, user.userId)));
System.Threading.Tasks.Task.Factory.StartNew(() =>
System.Windows.Forms.MessageBox.Show(string.Format("用户{0} [{1}]上线", user.userName, user.userId)));