{"id":846,"date":"2013-11-30T02:16:14","date_gmt":"2013-11-30T02:16:14","guid":{"rendered":"http:\/\/blog.jaringanhosting.com\/?p=846"},"modified":"2013-12-03T02:03:05","modified_gmt":"2013-12-03T02:03:05","slug":"asp-net-hosting-jaringanhosting-com-tutorial-cancelling-tasks-pada-net-4-0","status":"publish","type":"post","link":"https:\/\/blog.jaringanhosting.com\/index.php\/asp-net-hosting-jaringanhosting-com-tutorial-cancelling-tasks-pada-net-4-0\/","title":{"rendered":"ASP.NET Hosting – JaringanHosting.com :: Tutorial Cancelling Tasks Pada .NET 4.0"},"content":{"rendered":"

. NET 4.0<\/a> memperkenalkan sebuah intstuksi yang disebut CancellationToken<\/em> yang menyediakan mekanisme untuk membatalkan operasi baik yang sinkron dan asynchronous . Berikut adalah beberapa hal penting dari struktur ini :<\/p>\n

*isCancellationRequested<\/em> – properti pada Boolean yang dapat disurvei oleh kode yang berfugnsi untuk mengetahui apakah telah dibatalkan atau dilakukan permintaan pembatalan.<\/p>\n

*Register<\/em> – untuk mendaftar ketika permintaan pembatalan telah dilakukan.<\/p>\n

\"banner<\/a><\/p>\n

Disini terdapat CancellationTokenSource, yang berfungsi untuk mendapatkan token pembatalan . Keuntungan pada model pembatalan ini adalah bahwa token pembatalan dapat dikirimkan secara bebas kepada para listeners .. Berikut adalah langkah-langkah yang diperlukan untuk proses pembatalan :<\/p>\n

1. Pertama, buat cancellation token(cToken) menggunakan CancellationTokenSource class.<\/p>\n

2. Pada GenerateNumbers\u00a0 > Task<>.Factory.StartNew().<\/p>\n

3. Masuk ke bagian Register(), metode ini untuk proses registrasi pada cancelNotification. Jadi, nanti akan ada notifikasi permintaan proses pembatalan telah dibuat.<\/p>\n

4. Setelah itu, CancellationTokenSource.Cancel() , dan proses pembatalan telah selesai.<\/p>\n

C#<\/p>\n

using System;<\/p>\n

using System.Threading.Tasks;<\/p>\n

using System.Threading;<\/p>\n

namespace CancelTask<\/p>\n

{<\/p>\n

class Program<\/p>\n

{<\/p>\n

static void Main(string[] args)<\/p>\n

{<\/p>\n

Console.WriteLine(“Press 1 to cancel task”);<\/p>\n

var cTokenSource = new CancellationTokenSource();<\/p>\n

\/\/ Create a cancellation token from CancellationTokenSource<\/p>\n

var cToken = cTokenSource.Token;<\/p>\n

\/\/ Create a task and pass the cancellation token<\/p>\n

var t1 = Task<int>.Factory.StartNew(()<\/p>\n

=> GenerateNumbers(cToken), cToken);<\/p>\n

\/\/ to register a delegate for a callback when a<\/p>\n

\/\/ cancellation request is made<\/p>\n

cToken.Register(() => cancelNotification());<\/p>\n

\/\/ If user presses 1, request cancellation.<\/p>\n

if (Console.ReadKey().KeyChar == ‘1’)<\/p>\n

{<\/p>\n

\/\/ cancelling task<\/p>\n

cTokenSource.Cancel();<\/p>\n

}<\/p>\n

Console.ReadLine();<\/p>\n

}<\/p>\n

static int GenerateNumbers(CancellationToken ct)<\/p>\n

{<\/p>\n

int i;<\/p>\n

for (i = 0; i < 10; i++)<\/p>\n

{<\/p>\n

Console.WriteLine(“Method1 – Number: {0}”, i);<\/p>\n

Thread.Sleep(1000);<\/p>\n

\/\/ poll the IsCancellationRequested property<\/p>\n

\/\/ to check if cancellation was requested<\/p>\n

if (ct.IsCancellationRequested)<\/p>\n

{<\/p>\n

break;<\/p>\n

}<\/p>\n

 <\/p>\n

}<\/p>\n

return i;<\/p>\n

}<\/p>\n

\/\/ Notify when task is cancelled<\/p>\n

static void cancelNotification()<\/p>\n

{<\/p>\n

Console.WriteLine(“Cancellation request made!!”);<\/p>\n

}<\/p>\n

}<\/p>\n

}<\/p>\n

 <\/p>\n

VB.NET (Converted)<\/p>\n

Imports System<\/p>\n

Imports System.Threading.Tasks<\/p>\n

Imports System.Threading<\/p>\n

Namespace CancelTask<\/p>\n

Friend Class Program<\/p>\n

Sub Main(ByVal args() As String)<\/p>\n

Console.WriteLine(“Press 1 to cancel task”)<\/p>\n

Dim cTokenSource = New CancellationTokenSource()<\/p>\n

‘ Create a cancellation token from CancellationTokenSource<\/p>\n

Dim cToken = cTokenSource.Token<\/p>\n

‘ Create a task and pass the cancellation token<\/p>\n

Dim t1 = Task(Of Integer).Factory.StartNew(Function() GenerateNumbers(cToken), cToken)<\/p>\n

‘ to register a delegate for a callback when a<\/p>\n

‘ cancellation request is made<\/p>\n

cToken.Register(Sub() cancelNotification())<\/p>\n

‘ If user presses 1, request cancellation.<\/p>\n

If Console.ReadKey().KeyChar = “1”c Then<\/p>\n

‘ cancelling task<\/p>\n

cTokenSource.Cancel()<\/p>\n

End If<\/p>\n

Console.ReadLine()<\/p>\n

End Sub<\/p>\n

 <\/p>\n

Private Shared Function GenerateNumbers(ByVal ct As CancellationToken) As Integer<\/p>\n

Dim i As Integer<\/p>\n

For i = 0 To 9<\/p>\n

Console.WriteLine(“Method1 – Number: {0}”, i)<\/p>\n

Thread.Sleep(1000)<\/p>\n

‘ poll the IsCancellationRequested property<\/p>\n

‘ to check if cancellation was requested<\/p>\n

If ct.IsCancellationRequested Then<\/p>\n

Exit For<\/p>\n

End If<\/p>\n

Next i<\/p>\n

Return i<\/p>\n

End Function<\/p>\n

‘ Notify when task is cancelled<\/p>\n

Private Shared Sub cancelNotification()<\/p>\n

Console.WriteLine(“Cancellation request made!!”)<\/p>\n

End Sub<\/p>\n

End Class<\/p>\n

End Namespace<\/p>\n

Maka hasil outputnya adalah :<\/strong><\/p>\n

\"output1\"<\/a><\/p>\n

JaringanHosting.com adalah provider ASP.NET dan Windows hosting No #1 di Indonesia sesuai dengan rekomendasi dari pihak Microsoft. Microsoft memberikan rekomendasi ini berdasarkan pada beberapa persyaratan utama, yaitu: WebMatrix, WebDeploy, Visual Studio 2012, ASP.NET 4.5, ASP.NET MVC 4.0, Silverlight 5 and Visual Studio Lightswitch.Untuk keterangan lanjutan, silahkan klik disini!<\/a><\/p><\/blockquote>\n","protected":false},"excerpt":{"rendered":"

. NET 4.0 memperkenalkan sebuah intstuksi yang disebut CancellationToken yang menyediakan mekanisme untuk membatalkan operasi baik yang sinkron dan asynchronous . Berikut adalah beberapa hal penting dari struktur ini : *isCancellationRequested – properti pada Boolean yang dapat disurvei oleh kode<\/p>\n","protected":false},"author":746,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[],"tags":[],"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/blog.jaringanhosting.com\/index.php\/wp-json\/wp\/v2\/posts\/846"}],"collection":[{"href":"https:\/\/blog.jaringanhosting.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.jaringanhosting.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.jaringanhosting.com\/index.php\/wp-json\/wp\/v2\/users\/746"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.jaringanhosting.com\/index.php\/wp-json\/wp\/v2\/comments?post=846"}],"version-history":[{"count":0,"href":"https:\/\/blog.jaringanhosting.com\/index.php\/wp-json\/wp\/v2\/posts\/846\/revisions"}],"wp:attachment":[{"href":"https:\/\/blog.jaringanhosting.com\/index.php\/wp-json\/wp\/v2\/media?parent=846"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.jaringanhosting.com\/index.php\/wp-json\/wp\/v2\/categories?post=846"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.jaringanhosting.com\/index.php\/wp-json\/wp\/v2\/tags?post=846"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}