1.步骤1，界面 2.步骤2 只对之前Tread部分进行了修改，利用Task.Run()对一般方法进行定义任务。其余除List类型放生变化，其余和多线程一样。
namespace WpfApp1 { /// <summary> /// MainWindow.xaml 的交互逻辑 /// </summary> public partial class MainWindow : Window { public MainWindow() { InitializeComponent(); tb.Visibility = Visibility.Hidden; } string hostname; List<Thread> threads = new List<Thread>(); Stopwatch SumSW = new Stopwatch(); Stopwatch sw1 = new Stopwatch(); Object obj = new object(); int num = 0; private void Button_Click(object sender, RoutedEventArgs e) { num = 0; threads.Clear(); Button mybutton = sender as Button; string strCurrent = mybutton.Content.ToString(); int n = int.Parse(t3.Text) - int.Parse(t2.Text); if(n<0) { MessageBox.Show("地址范围有错"); return; } listbox.Items.Clear(); for (int i = 0; i <= n; i++) { int n2 = int.Parse(t2.Text) + i; string lip = n2.ToString(); string strIP = t1.Text + lip; if (strCurrent=="单线程") { SumSW.Start(); GetInfo(strIP); } else { Thread t = new Thread(GetInfo); SumSW.Start(); t.Start(strIP); threads.Add(t); } } } public void GetInfo(Object strIP) { string strIP2 = strIP as string; try { IPAddress ip = IPAddress.Parse(strIP2); } catch(Exception) { tb.Visibility = Visibility.Visible; } sw1.Start(); try { hostname = Dns.GetHostEntry(strIP2).HostName; } catch (Exception) { hostname = "（不在线）"; } sw1.Stop(); listbox.Dispatcher.Invoke(() => { listbox.Items.Add("扫描地址:" + strIP + "扫描时间"+sw1.ElapsedMilliseconds+ "毫秒,主机DNS名称:" + hostname); }); lock(obj) { num++; } if(num==threads.Count) { SumSW.Stop(); listbox.Dispatcher.Invoke(() => { listbox.Items.Add("扫描总时间" + SumSW.ElapsedMilliseconds + "毫秒"); }); } } } }问题讨论： 1.方法名没加async
2.task.add加在了await前面，导致按次输出等待并导致num一直等于t.Count每次都输出总时间。删去await解决
