vb點(diǎn)虐 中如何結(jié)束一個(gè)線程

vb點(diǎn)虐 中如何結(jié)束一個(gè)線程

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一般而言,如果您想終止一個(gè)線程,您可以使用System.Threading.Thread類(lèi)的Abort方法. 例如:

Dim worker As ThreadStart = New ThreadStart(AddressOf workerthreadmethod)

Dim t As Thread = New Thread(worker)

t.Start()

MessageBox.Show("Wait for a while for the thread to start.")

MessageBox.Show(t.ThreadState.ToString())

t.Abort()

MessageBox.Show(t.ThreadState.ToString())

t.Join()

MessageBox.Show(t.ThreadState.ToString())

當(dāng)然,在調(diào)用Abort方法后,線程并不是立刻終止,要等線程的所有finally快中的代碼完成后才會(huì)完全終止. 所以在主線程中可以用Join方法來(lái)同步,當(dāng)線程還未完全終止時(shí),t.Join()將處于等待,直到t線程完全結(jié)束后再繼續(xù)執(zhí)行后面的語(yǔ)句。

Abort方法是會(huì)導(dǎo)致線程跳出一個(gè)異常錯(cuò)誤的，你需要在代碼中捕獲該異常。下面是一個(gè)比較完整的VB.NET線程例子：

Imports System

Imports System.Threading

Public Class MyTestApp

Public Shared Sub Main()

Dim t As New Thread(New ThreadStart(AddressOf MyThreadMethod))

'Start the thread

t.Start()

MsgBox("Are you ready to kill the thread?")

'Kill the child thread and this will cause the thread raise an exception

t.Abort()

' Wait for the thread to exit

t.Join()

MsgBox("The secondary thread has terminated.")

End Sub

Shared Sub MyThreadMethod()

Dim i As Integer

Try

Do While True

Thread.CurrentThread.Sleep(1000)

Console.WriteLine("This is the secondary thread running.")

Loop

Catch e As ThreadAbortException

MsgBox("This thread is going to be terminated by the Abort method in the Main function")

End Try

End Sub

End Class

Thread.Abort()方法用來(lái)永久銷(xiāo)毀一個(gè)線程，而且將拋出ThreadAbortException異常。使終結(jié)的線程可以捕獲到異常但是很難控制恢復(fù)，僅有的辦法是調(diào)用Thread.ResetAbort()來(lái)取消剛才的調(diào)用，而且只有當(dāng)這個(gè)異常是由于被調(diào)用線程引起的異常。因此，A線程可以正確的使用Thread.Abort()方法作用于B線程，但是B線程卻不能調(diào)用Thread.ResetAbort()來(lái)取消Thread.Abort()操作。

vb點(diǎn)虐 怎樣操作帶參數(shù)的多線程

public class threadclass

{

public int a;

public void threadmethod()

{

//use a;

}

}

...

threadclass tc = new ....

tc.a = 10;

Thread t = new ThreadStart(tc.threadmethod);

t.Start

VB點(diǎn)虐 如何設(shè)計(jì)多線程運(yùn)行

Sub Main()

Dim thr As Thread

For Pi As Integer=0 To 4 //啟用5線程

MulParams =Pi vbTab sFile vbTab dFile vbTab 1 vbTab DelN vbTab cr vbTab cg vbTab cb vbTab IndexI

GlobalParamas(pi)=MulParams .Split(vbTab)

thr=New Thread(AddressOf MyMulThreadCaller)

thr.Start() //啟動(dòng)多線程進(jìn)程

Application.DoEvents

Next

End Sub