敬请各位高手解决：vb.net2010如何判断所有多线程都已经运行完毕的问题？谢谢 - 编程论坛

#2

HVB62017-09-05 09:02

补充：由于每次处理的问题的难度不一，程序运行完毕的时间也不一致，少则几秒，多则几分钟。

#3

HVB62017-09-05 17:28

以下是微软的答复，太复杂。
https://msdn.(v=vs.110).aspx?cs-save-lang=1&cs-lang=vb#code-snippet-1

#4

HVB62017-09-06 16:17

微软的答复，本人认为只是说明如何运行多线程，没有说到如何判断所有的多线程已经全部运行完毕。

#5

不说也罢2017-09-17 19:25

以下是引用HVB6在2017-9-6 16:17:50的发言：

微软的答复，本人认为只是说明如何运行多线程，没有说到如何判断所有的多线程已经全部运行完毕。

微软的example已经比较清晰了呀，ThreadPool提供了一个线程池，可以发送工作、处理异步、线程等待、线程记时，它的QueueUserWorkItem就是将方法排入队列，以便执行。
你可以建一个控制台应用程序，启动对象设为sub main:

程序代码：

Imports System.Diagnostics
Imports System.Threading
Module Example
    Public Delegate Sub ThreadStart()
    Public Sub Main()
        ThreadPool.QueueUserWorkItem(AddressOf ExecuteInForeground)
        Dim th1 As New Thread(AddressOf ExecuteInForeground)
        th1.Start()
        Dim th2 As New Thread(AddressOf ExecuteInForeground)
        th2.IsBackground = True
        th2.Start()
        Thread.Sleep(500)
        ThreadPool.QueueUserWorkItem(AddressOf WriteNumber)
        Dim th3 As New Thread(AddressOf WriteNumber)
        th3.IsBackground = True
        th3.Start()
        Thread.Sleep(500)
        ExecuteInForeground()
        'WriteNumber()
        MsgBox("所有线程都over了")
    End Sub

    Private Sub ExecuteInForeground()
        Dim start As DateTime = DateTime.Now
        Dim sw As Stopwatch = Stopwatch.StartNew()
        Console.WriteLine("Thread {0}: {1}, Priority {2}", _
                          Thread.CurrentThread.ManagedThreadId, _
                          Thread.CurrentThread.ThreadState, _
                          Thread.CurrentThread.Priority)
        Do
            Console.WriteLine("Thread {0}: Elapsed {1:N2} seconds", _
                              Thread.CurrentThread.ManagedThreadId, _
                              sw.ElapsedMilliseconds / 1000)
            Thread.Sleep(500)
        Loop While sw.ElapsedMilliseconds <= 5000
        sw.Stop()
    End Sub
    Private Sub WriteNumber()
        Dim i As Integer = 0
        Do
            i += 1
            Console.WriteLine(i.ToString)
        Loop While i <= 9000
    End Sub
End Module

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