本文整理匯總了VB.NET中System.Threading.Tasks.Task.WaitAll方法的典型用法代碼示例。如果您正苦於以下問題：VB.NET Task.WaitAll方法的具體用法？VB.NET Task.WaitAll怎麽用？VB.NET Task.WaitAll使用的例子？那麽, 這裏精選的方法代碼示例或許可以為您提供幫助。您也可以進一步了解該方法所在類System.Threading.Tasks.Task的用法示例。
在下文中一共展示了Task.WaitAll方法的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: WaitAllDemo
' 導入命名空間
Imports System.Collections.Generic
Imports System.Threading
Imports System.Threading.Tasks
Module WaitAllDemo
Sub Main()
Dim tasks As New List(Of Task(Of Integer))()
' Define a delegate that prints and returns the system tick count
Dim action As Func(Of Object, Integer) = Function(obj As Object)
Dim i As Integer = CInt(obj)
' Make each thread sleep a different time in order to return a different tick count
Thread.Sleep(i * 100)
' The tasks that receive an argument between 2 and 5 throw exceptions
If 2 <= i AndAlso i <= 5 Then
Throw New InvalidOperationException("SIMULATED EXCEPTION")
End If
Dim tickCount As Integer = Environment.TickCount
Console.WriteLine("Task={0}, i={1}, TickCount={2}, Thread={3}", Task.CurrentId, i, tickCount, Thread.CurrentThread.ManagedThreadId)
Return tickCount
End Function
' Construct started tasks
For i As Integer = 0 To 9
Dim index As Integer = i
tasks.Add(Task(Of Integer).Factory.StartNew(action, index))
Next
Try
' Wait for all the tasks to finish.
Task.WaitAll(tasks.ToArray())
' We should never get to this point
Console.WriteLine("WaitAll() has not thrown exceptions. THIS WAS NOT EXPECTED.")
Catch e As AggregateException
Console.WriteLine(vbLf & "The following exceptions have been thrown by WaitAll(): (THIS WAS EXPECTED)")
For j As Integer = 0 To e.InnerExceptions.Count - 1
Console.WriteLine(vbLf & "-------------------------------------------------" & vbLf & "{0}", e.InnerExceptions(j).ToString())
Next
End Try
End Sub
End Module輸出：
Task=1, i=0, TickCount=1203822250, Thread=3 Task=2, i=1, TickCount=1203822359, Thread=4 Task=7, i=6, TickCount=1203823484, Thread=3 Task=8, i=7, TickCount=1203823890, Thread=4 Task=9, i=8, TickCount=1203824296, Thread=3 Task=10, i=9, TickCount=1203824796, Thread=4 The following exceptions have been thrown by WaitAll(): (THIS WAS EXPECTED) ------------------------------------------------- System.InvalidOperationException: SIMULATED EXCEPTION at Example.b__0(Object obj) at System.Threading.Tasks.Task`1.InnerInvoke() at System.Threading.Tasks.Task.Execute() ------------------------------------------------- System.InvalidOperationException: SIMULATED EXCEPTION at Example. b__0(Object obj) at System.Threading.Tasks.Task`1.InnerInvoke() at System.Threading.Tasks.Task.Execute() ------------------------------------------------- System.InvalidOperationException: SIMULATED EXCEPTION at Example. b__0(Object obj) at System.Threading.Tasks.Task`1.InnerInvoke() at System.Threading.Tasks.Task.Execute() ------------------------------------------------- System.InvalidOperationException: SIMULATED EXCEPTION at Example. b__0(Object obj) at System.Threading.Tasks.Task`1.InnerInvoke() at System.Threading.Tasks.Task.Execute()