本文整理匯總了VB.NET中System.Web.UI.PageAsyncTask.BeginHandler屬性的典型用法代碼示例。如果您正苦於以下問題：VB.NET PageAsyncTask.BeginHandler屬性的具體用法？VB.NET PageAsyncTask.BeginHandler怎麽用？VB.NET PageAsyncTask.BeginHandler使用的例子？那麽, 這裏精選的屬性代碼示例或許可以為您提供幫助。您也可以進一步了解該屬性所在類System.Web.UI.PageAsyncTask的用法示例。
在下文中一共展示了PageAsyncTask.BeginHandler屬性的1個代碼示例，這些例子默認根據受歡迎程度排序。您可以為喜歡或者感覺有用的代碼點讚，您的評價將有助於係統推薦出更棒的VB.NET代碼示例。
示例1: AsyncTaskDelegate
' 導入命名空間
Imports System.Threading
Namespace Samples.AspNet.VB.Controls
Public Class SlowTask
Private _taskprogress As String
Private _dlgt As AsyncTaskDelegate
' Create delegate.
Protected Delegate Sub AsyncTaskDelegate()
Public Function GetAsyncTaskProgress() As String
Return _taskprogress
End Function
Public Sub ExecuteAsyncTask()
' Introduce an artificial delay to simulate a delayed
' asynchronous task.
Thread.Sleep(TimeSpan.FromSeconds(5.0))
End Sub
' 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 = "AsyncTask started at: " + DateTime.Now.ToString + ". "
_dlgt = New AsyncTaskDelegate(AddressOf ExecuteAsyncTask)
Dim result As IAsyncResult = _dlgt.BeginInvoke(cb, extraData)
Return result
End Function
' Define the method that will get called when
' the asynchronous task is ended.
Public Sub OnEnd(ByVal ar As IAsyncResult)
_taskprogress += "AsyncTask completed at: " + DateTime.Now.ToString
_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 += "AsyncTask failed to complete " + _
"because it exceeded the AsyncTimeout parameter."
End Sub
End Class
End Namespace