包含vb点虐 中loop的词条

VB中如何同时运行2个Do...Loop until...语句

真正同时运行两个Do Loop循环,只能靠多线程或者多进程来实现。若你正在用VB.Net里的Do Loop,那么可以很简单就能实现多线程了。 但如果你是在VB6里,只能用ActiveX.exe方式通过多个进程来实现这个同时Do Loop循环。

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说起来其实并不复杂,但需要你会写VB6的Class类里的那点知识即可。

VB点虐 Do ... Loop Until循环和Do Until ... Loop循环

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

Dim sum As Integer = 0

Dim i As Integer = 0

Do

i = i + 1

sum = sum + i

Loop Until sum 6000

MsgBox(i)

Debug.Print(sum)

End Sub

vb点虐 利用doloop until 计算从1开始的素数之和直到和不大于989为止

Module Module1

Sub Main()

Dim sum As Integer = 0

Dim Bound As Integer = 989

Dim num As Integer = 0

Dim cprime As Integer = 0

Do

num += 1

If IsPrame(num) Then

sum += num

cprime = num

End If

Loop Until sum  Bound

Console.WriteLine(sum - cprime)

Console.ReadKey()

End Sub

'判断一个数是不是素数

Public Function IsPrame(ByVal num As Integer) As Boolean

If num = 1 Then Return False '素数的定义是大于1

For i = 2 To CType(Int(Math.Sqrt(num)), Integer)

If num Mod i = 0 Then Return False

Next

Return True

End Function

End Module

vb点虐 中如何设置进程的基本优先级

下面的代码示例说明了更改线程优先级的结果。创建两个线程,其中一个线程的优先级设置为 BelowNormal。两个线程在 while 循环中都增加一个变量,并运行一段设定的时间。

Option Explicit

Option Strict

Imports System

Imports System.Threading

Public Class Test

MTAThread _

Shared Sub Main()

Dim priorityTest As New PriorityTest()

Dim threadOne As Thread = _

New Thread(AddressOf priorityTest.ThreadMethod)

threadOne.Name = "ThreadOne"

Dim threadTwo As Thread = _

New Thread(AddressOf priorityTest.ThreadMethod)

threadTwo.Name = "ThreadTwo"

threadTwo.Priority = ThreadPriority.BelowNormal

threadOne.Start()

threadTwo.Start()

' Allow counting for 10 seconds.

Thread.Sleep(10000)

priorityTest.LoopSwitch = False

End Sub

End Class

Public Class PriorityTest

Dim loopSwitchValue As Boolean

Sub New()

loopSwitchValue = True

End Sub

WriteOnly Property LoopSwitch As Boolean

Set

loopSwitchValue = Value

End Set

End Property

Sub ThreadMethod()

Dim threadCount As Long = 0

While loopSwitchValue

threadCount += 1

End While

Console.WriteLine("{0} with {1,11} priority " _

"has a count = {2,13}", Thread.CurrentThread.Name, _

Thread.CurrentThread.Priority.ToString(), _

threadCount.ToString("N0"))

End Sub

End Class


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