1、Thread.Sleep 是同步延迟， Task.Delay异步延迟。

2、Thread.Sleep 会阻塞线程，Task.Delay不会。

Task.Factory.StartNew(delegate { for(int i=1;i<50;i++) { System.Diagnostics.Debug.WriteLine(i.ToString()); Thread.Sleep(100); } }); Task.Factory.StartNew(delegate { for (int i = 101; i < 150; i++) { System.Diagnostics.Debug.WriteLine(i.ToString()); Task.Delay(100); } });

虽然此处delay的用法有待商榷，但确实不会阻塞

3、Thread.Sleep不能取消，Task.Delay可以。

引用别人的例子

using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Threading; using System.Threading.Tasks; using System.Windows.Forms; namespace ThreadSleepTaskDelayDemo { public partial class Form1 : Form { CancellationTokenSource tokenSource = new CancellationTokenSource(); public Form1() { InitializeComponent(); } private void btnThreadSleep_Click(object sender, EventArgs e) { PutThreadSleep(); MessageBox.Show("I am back"); } private async void btnTaskDelay_Click(object sender, EventArgs e) { await PutTaskDelay(); MessageBox.Show("I am back"); } void PutThreadSleep() { Thread.Sleep(5000); } async Task PutTaskDelay() { try { await Task.Delay(5000, tokenSource.Token); } catch (TaskCanceledException ex) { } catch (Exception ex) { } } private void btnCancelTaskDelay_Click(object sender, EventArgs e) { tokenSource.Cancel(); } } }