本文整理汇总了VB.NET中System.Web.UI.Page.RegisterAsyncTask方法的典型用法代码示例。如果您正苦于以下问题：VB.NET Page.RegisterAsyncTask方法的具体用法？VB.NET Page.RegisterAsyncTask怎么用？VB.NET Page.RegisterAsyncTask使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类System.Web.UI.Page的用法示例。
在下文中一共展示了Page.RegisterAsyncTask方法的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: OnEnd
' 导入命名空间
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