本文整理汇总了VB.NET中System.Threading.Tasks.Task.WaitAll方法的典型用法代码示例。如果您正苦于以下问题：VB.NET Task.WaitAll方法的具体用法？VB.NET Task.WaitAll怎么用？VB.NET Task.WaitAll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.Threading.Tasks.Task的用法示例。
在下文中一共展示了Task.WaitAll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，您的评价将有助于我们的系统推荐出更棒的VB.NET代码示例。
示例1: WaitAllDemo
' 导入命名空间
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
开发者ID:VB.NET开发者，项目名称:System.Threading.Tasks，代码行数:46，代码来源:Task.WaitAll 输出：
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()
注：本文中的System.Threading.Tasks.Task.WaitAll方法示例整理自Github/MSDocs等源码及文档管理平台，相关代码片段筛选自各路编程大神贡献的开源项目，源码版权归原作者所有，传播和使用请参考对应项目的License；未经允许，请勿转载。 |
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