本文整理汇总了VB.NET中System.Web.UI.PageAsyncTask类的典型用法代码示例。如果您正苦于以下问题：VB.NET PageAsyncTask类的具体用法？VB.NET PageAsyncTask怎么用？VB.NET PageAsyncTask使用的例子？那么恭喜您, 这里精选的类代码示例或许可以为您提供帮助。
在下文中一共展示了PageAsyncTask类的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的VB.NET代码示例。
示例1: AsyncTaskDelegate
' 导入命名空间
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