public sealed partial class WorkItem : Page{private IAsyncAction _threadPoolWorkItem;private ManualResetEvent _sleep = new ManualResetEvent(false);public WorkItem(){this.InitializeComponent();}// 在線程池中找一個線程去執行指定的方法，并指定其優先級private void btnCreateWorkItem_Click_1(object sender, RoutedEventArgs e){_threadPoolWorkItem = Windows.System.Threading.ThreadPool.RunAsync((threadPoolWorkItem) =>{int percent = 0; // 用于模擬執行進度（0 - 100）while (percent < 100){// 當前線程 sleep 100 毫秒_sleep.WaitOne(100);// 如果 IAsyncAction 被取消了則退出此 handler 的執行if (threadPoolWorkItem.Status == AsyncStatus.Canceled)break;percent++;var ignored = Dispatcher.RunAsync(CoreDispatcherPriority.High,() =>{lblProgress.Text = "進度：" + percent.ToString() + "%";});}},WorkItemPriority.High);// IAsyncAction 完成之后（比如任務完成了或者任務取消了）// 關于 IAsyncAction 的詳細說明請參見 XamlDemo/Thread/Async_threadPoolWorkItem.Completed = new AsyncActionCompletedHandler(async (IAsyncAction threadPoolWorkItem, AsyncStatus status) =>{await Dispatcher.RunAsync(CoreDispatcherPriority.High,() =>{switch (status){case AsyncStatus.Completed:lblMsg.Text = "任務完成了";break;case AsyncStatus.Canceled:lblMsg.Text = "任務取消了";break;case AsyncStatus.Started:case AsyncStatus.Error:break;}});});lblProgress.Text = "進度：0%";lblMsg.Text = "任務開始了";}// 取消任務private void btnCancelWorkItem_Click_1(object sender, RoutedEventArgs e){if (_threadPoolWorkItem != null){_threadPoolWorkItem.Cancel();_threadPoolWorkItem = null;}}// 通過 async await 簡化 ThreadPool.RunAsync() 的使用（關于 async 和 await 的詳細說明請參見 XamlDemo/Thread/Async）private async void btnCreateWorkItemByAwait_Click_1(object sender, RoutedEventArgs e){lblProgress.Text = "";lblMsg.Text = "";string result = "";await Windows.System.Threading.ThreadPool.RunAsync(delegate{new ManualResetEvent(false).WaitOne(3000);result = "在線程池中找一個線程去執行指定的邏輯，然后通過 await 返回 UI 線程";});lblMsg.Text = result;}}

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轉載于:https://www.cnblogs.com/lzhp/p/3423279.html

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