Bạn có thể có một phương thức không đồng bộ của cuộc gọi điều khiển nếu nó nằm trên một trang. Xem ví dụ dưới đây:
Page.aspx
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Page.aspx.cs" Inherits="AsyncDEmo.Page" Async="true" %>
<%@ Register Src="~/Control.ascx" TagPrefix="uc1" TagName="Control" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<uc1:Control runat="server" id="Control" />
</form>
</body>
</html>
Các codebehind của Page.aspx trống
Control.ascx
<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="Control.ascx.cs" Inherits="AsyncDEmo.Control" %>
<span id="TaskMessage" runat="server">
</span>
kiểm soát codebehind
protected void Page_Load(object sender, EventArgs e)
{
// Define the asynchronuous task.
Samples.AspNet.CS.Controls.SlowTask slowTask1 =
new Samples.AspNet.CS.Controls.SlowTask();
Samples.AspNet.CS.Controls.SlowTask slowTask2 =
new Samples.AspNet.CS.Controls.SlowTask();
Samples.AspNet.CS.Controls.SlowTask slowTask3 =
new Samples.AspNet.CS.Controls.SlowTask();
PageAsyncTask asyncTask1 = new PageAsyncTask(slowTask1.OnBegin, slowTask1.OnEnd, slowTask1.OnTimeout, "Async1", true);
PageAsyncTask asyncTask2 = new PageAsyncTask(slowTask2.OnBegin, slowTask2.OnEnd, slowTask2.OnTimeout, "Async2", true);
PageAsyncTask asyncTask3 = new PageAsyncTask(slowTask3.OnBegin, slowTask3.OnEnd, slowTask3.OnTimeout, "Async3", true);
// Register the asynchronous task.
Page.RegisterAsyncTask(asyncTask1);
Page.RegisterAsyncTask(asyncTask2);
Page.RegisterAsyncTask(asyncTask3);
// Execute the register asynchronous task.
Page.ExecuteRegisteredAsyncTasks();
TaskMessage.InnerHtml = slowTask1.GetAsyncTaskProgress() + "<br />" + slowTask2.GetAsyncTaskProgress() + "<br />" + slowTask3.GetAsyncTaskProgress();
}
SlowClass.cs
public class SlowTask
{
private String _taskprogress;
private AsyncTaskDelegate _dlgt;
// Create delegate.
protected delegate void AsyncTaskDelegate();
public String GetAsyncTaskProgress()
{
return _taskprogress;
}
public void ExecuteAsyncTask()
{
// Introduce an artificial delay to simulate a delayed
// asynchronous task.
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 = "AsyncTask started at: " + DateTime.Now + ". ";
_dlgt = new AsyncTaskDelegate(ExecuteAsyncTask);
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 += "AsyncTask completed at: " + DateTime.Now;
_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 += "AsyncTask failed to complete " +
"because it exceeded the AsyncTimeout parameter.";
}
}
Nguồn
2013-03-26 21:25:39