Windows 8 Store Apps Learning (42) Multi-thread thread pool

Multi-thread thread pool: Deferred execution, cycle execution, find a thread in the threads pool to execute the specified method

Introduced

Re-imagine the Windows 8 Store Apps thread pool

Implementing deferred execution via Threadpooltimer

Implement cycle execution through Threadpooltimer

Using the ThreadPool implementation "find a thread in the threads pool to execute the specified method"

Example

1. Implement deferred execution via Threadpooltimer (Threadpooltimer under Windows.System.Threading namespace)

Thread/threadpool/delaytimer.xaml

<page
    x:class= "XamlDemo.Thread.ThreadPool.DelayTimer"
    xmlns= "http://schemas.microsoft.com/winfx/ 2006/xaml/presentation "
    xmlns:x=" Http://schemas.microsoft.com/winfx/2006/xaml "
    xmlns:local=" using: XamlDemo.Thread.ThreadPool "
    xmlns:d=" http://schemas.microsoft.com/expression/blend/2008 "
    xmlns:mc=" http://schemas.openxmlformats.org/markup-compatibility/2006 "
    mc:ignorable=" D ">
    
    <grid background=" Transparent ">
        <stackpanel margin=" 0 0 0 ">
                
            <textblock name=" lblmsg "fontsize=" 14.667 "/>
                
            <button name= "Btncreatedelay" content= "delay 3 seconds to perform a task" click= "Btncreatedelay_click_1" margin= "0 0 0"/>< C12/><button name= "Btncanceldelay" content= "Cancel Task" click= "Btncanceldelay_click_1" margin= "0 0 0"/> </
    
        stackpanel>
    </Grid>
</Page>

Thread/threadpool/delaytimer.xaml.cs

* * Implement deferred execution via Threadpooltimer (Threadpooltimer under Windows.System.Threading namespace) * * Threadpooltimer-timer * THR Eadpooltimer Createtimer (Timerelapsedhandler handler, TimeSpan delay, timerdestroyedhandler destroyed); -Create a timer for deferred execution * Handler-after the specified delay time, the method required to execute * delay-delay time * destroyed-when Threadpooltimer
The method executed after the completion of its own mission (for example, the delay method is executed or the timer is canceled) * Cancel ()-Cancels the timer * Delay-delay time, read only/using System;
Using Windows.UI.Xaml;
Using Windows.UI.Xaml.Controls;
Using Windows.System.Threading;
    
Using Windows.UI.Core; Namespace XamlDemo.Thread.ThreadPool {public sealed partial class Delaytimer:page {private Threa
    
        Dpooltimer _timer; Public Delaytimer () {this.
        InitializeComponent ();
            //Create a delay timer private void Btncreatedelay_click_1 (object sender, RoutedEventArgs e) { 
  _timer = Threadpooltimer.createtimer (timer) =>              {var ignored = Dispatcher.runasync (Coredispatcherpriority.high,
                        () => {lblmsg.text = "task executed";
                }); }, Timespan.fromseconds (3), (timer) => {var Igno
                            Red = Dispatcher.runasync (Coredispatcherpriority.high, () => {
                            Lblmsg.text + = Environment.NewLine;
                        Lblmsg.text = "Threadpooltimer's mission is over";
                });
    
            });
        Lblmsg.text = "Delay 3 seconds to perform a task";
            }//Cancel timer private void Btncanceldelay_click_1 (object sender, RoutedEventArgs e) { if (_timer!= null) {_timer.
                Cancel ();
    
                _timer = null; Lblmsg.text + + ENVIRONMENT.NEWLIne
            Lblmsg.text + = "Mission Canceled"; }
        }
    }
}