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Page.ExecuteRegisteredAsyncTasks (Método)
Espacio de nombres: System.Web.UI
Ensamblado: System.Web (en System.Web.dll)
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<%@ Page Language="VB" AsyncTimeout="2"%> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <script runat="server"> Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) ' Define the asynchronuous task. Dim mytask As New Samples.AspNet.VB.Controls.MyAsyncTask() Dim asynctask As New PageAsyncTask(AddressOf mytask.OnBegin, AddressOf mytask.OnEnd, AddressOf mytask.OnTimeout, DBNull.Value) ' Register the asynchronous task. Page.RegisterAsyncTask(asynctask) ' Execute the register asynchronous task. Page.ExecuteRegisteredAsyncTasks() TaskMessage.InnerHtml = mytask.GetAsyncTaskProgress() End Sub </script> <html xmlns="http://www.w3.org/1999/xhtml" > <head runat="server"> <title>Asynchronous Task Example</title> </head> <body> <form id="form1" runat="server"> <div> <span id="TaskMessage" runat="server"> </span> </div> </form> </body> </html>
<%@ Page Language="C#" AsyncTimeout="2"%> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <script runat="server"> protected void Page_Load(object sender, EventArgs e) { // Define the asynchronuous task. Samples.AspNet.CS.Controls.MyAsyncTask mytask = new Samples.AspNet.CS.Controls.MyAsyncTask(); PageAsyncTask asynctask = new PageAsyncTask(mytask.OnBegin, mytask.OnEnd, mytask.OnTimeout, null); // Register the asynchronous task. Page.RegisterAsyncTask(asynctask); // Execute the register asynchronous task. Page.ExecuteRegisteredAsyncTasks(); TaskMessage.InnerHtml = mytask.GetAsyncTaskProgress(); } </script> <html xmlns="http://www.w3.org/1999/xhtml" > <head runat="server"> <title>Asynchronous Task Example</title> </head> <body> <form id="form1" runat="server"> <div> <span id="TaskMessage" runat="server"> </span> </div> </form> </body> </html>
Imports Microsoft.VisualBasic Imports System Imports System.Web Imports System.Web.UI Imports System.Threading Namespace Samples.AspNet.VB.Controls Public Class MyAsyncTask Private _taskprogress As String Private _dlgt As AsyncTaskDelegate ' Create delegate. Delegate Function AsyncTaskDelegate() Public Function GetAsyncTaskProgress() As String Return _taskprogress End Function Public Function DoTheAsyncTask() ' Introduce an artificial delay to simulate a delayed ' asynchronous task. Make this greater than the ' AsyncTimeout property. Thread.Sleep(TimeSpan.FromSeconds(5.0)) End Function ' Define the method that will get called to ' start the asynchronous task. Public Function OnBegin(ByVal sender As Object, ByVal e As EventArgs, ByVal cb As AsyncCallback, ByVal extraData As Object) As IAsyncResult _taskprogress = "Beginning async task." Dim _dlgt As New AsyncTaskDelegate(AddressOf DoTheAsyncTask) Dim result As IAsyncResult = _dlgt.BeginInvoke(cb, extraData) Return result End Function 'OnBegin ' Define the method that will get called when ' the asynchronous task is ended. Public Sub OnEnd(ByVal ar As IAsyncResult) _taskprogress = "Asynchronous task completed." _dlgt.EndInvoke(ar) End Sub ' Define the method that will get called if the task ' is not completed within the asynchronous timeout interval. Public Sub OnTimeout(ByVal ar As IAsyncResult) _taskprogress = "Ansynchronous task failed to complete because " & _ "it exceeded the AsyncTimeout parameter." End Sub End Class End Namespace
using System; using System.Web; using System.Web.UI; using System.Threading; namespace Samples.AspNet.CS.Controls { public class MyAsyncTask { private String _taskprogress; private AsyncTaskDelegate _dlgt; // Create delegate. protected delegate void AsyncTaskDelegate(); public String GetAsyncTaskProgress() { return _taskprogress; } public void DoTheAsyncTask() { // Introduce an artificial delay to simulate a delayed // asynchronous task. Make this greater than the // AsyncTimeout property. Thread.Sleep(TimeSpan.FromSeconds(5.0)); } // Define the method that will get called to // start the asynchronous task. public IAsyncResult OnBegin(object sender, EventArgs e, AsyncCallback cb, object extraData) { _taskprogress = "Beginning async task."; _dlgt = new AsyncTaskDelegate(DoTheAsyncTask); IAsyncResult result = _dlgt.BeginInvoke(cb, extraData); return result; } // Define the method that will get called when // the asynchronous task is ended. public void OnEnd(IAsyncResult ar) { _taskprogress = "Asynchronous task completed."; _dlgt.EndInvoke(ar); } // Define the method that will get called if the task // is not completed within the asynchronous timeout interval. public void OnTimeout(IAsyncResult ar) { _taskprogress = "Ansynchronous task failed to complete " + "because it exceeded the AsyncTimeout parameter."; } } }
Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (no se admite el rol Server Core), Windows Server 2008 R2 (se admite el rol Server Core con SP1 o versiones posteriores; no se admite Itanium)
.NET Framework no admite todas las versiones de todas las plataformas. Para obtener una lista de las versiones compatibles, vea Requisitos de sistema de .NET Framework.
