Windows 8 Store Apps Learning (45) Multi-thread asynchronous programming: Iasyncaction

Multi-thread Asynchronous Programming: Iasyncaction, Iasyncoperation

Re-imagine Windows 8 Store Apps (45)-multi-line asynchronous programming: Iasyncaction, Iasyncoperation, iasyncactionwithprogress, IASYNCOPERATIONWITHPR Ogress

Introduced

Re-imagine the asynchronous programming of Windows 8 Store Apps

Iasyncaction-no return value, no progress value

Iasyncoperation-There are return values, no progress values

Iasyncactionwithprogress-no return value, there is a progress value

Iasyncoperationwithprogress-There is a return value, there is a progress value

Example

1, demo iasyncaction (no return value, no progress value) of the use

Thread/async/iasyncactiondemo.xaml

<page
    x:class= "XamlDemo.Thread.Async.IAsyncActionDemo"
    xmlns= "http://schemas.microsoft.com/winfx/ 2006/xaml/presentation "
    xmlns:x=" Http://schemas.microsoft.com/winfx/2006/xaml "
    xmlns:local=" using: XamlDemo.Thread.Async "
    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= "btncreateasyncaction" content= "execute a iasyncaction" click= "Btncreateasyncaction_click_1" margin= "0 0 0"/>
    
            <button name= "btncancelasyncaction" content= "Cancel" click= "Btncancelasyncaction_click_1" margin= "0 0 0"/>
    
        </StackPanel>
    </Grid>
</Page>

Thread/async/iasyncactiondemo.xaml.cs

* * Demo iasyncaction (no return value, no progress value) usage * * NOTE: * 1, WinRT asynchronous functions are derived from Iasyncinfo * 2, Iasyncaction, Iasyncoperation<tresu Lt&gt, Iasyncactionwithprogress<tprogress&gt, Iasyncoperationwithprogress<tresult, TProgress> inherit from Iasyncinfo * * * * Another: * Windows.System.Threading.ThreadPool.RunAsync ()-Return is iasyncaction * * using System.runt Ime.
Interopservices.windowsruntime;
Using System.Threading.Tasks;
Using Windows.foundation;
Using Windows.UI.Xaml;
    
Using Windows.UI.Xaml.Controls; Namespace XamlDemo.Thread.Async {public sealed partial class Iasyncactiondemo:page {private iasyncacti
    
        On _action; Public Iasyncactiondemo () {this.
        InitializeComponent (); Private Iasyncaction getasyncaction () {//through System.Runtime.InteropServices.WindowsRun Time.
                   Asyncinfo Create iasyncaction return Asyncinfo.run (token) =>//CancellationToken token Task.run (() => {token.
                            WaitHandle.WaitOne (3000); Token.
                        Throwifcancellationrequested ();
        }, token));  } private void Btncreateasyncaction_click_1 (object sender, RoutedEventArgs e) {_action =
    
            Getasyncaction (); Can be await _action//iasyncaction after completion of _action.
                Completed = (Asyncinfo, asyncstatus) =>//Iasyncaction asyncinfo, Asyncstatus asyncstatus {//Asyncstatus include: Started, Completed, Canceled, Error lblmsg.text = "Completed, Asy
                Ncstatus: "+ asyncstatus.tostring ();
    
            };
        Lblmsg.text = "Start execution, 3 seconds to complete";
        }//Cancel iasyncaction private void Btncancelasyncaction_click_1 (object sender, RoutedEventArgs e) {if (_Action!= null) _action.
        Cancel (); }
    }
}