vb.net里loop的简单介绍 _Loop

VB.net 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 = i1
sum = sumi
Loop Until sum6000
MsgBox(i)
Debug.Print(sum)
End Sub
vb.net中如何设置进程的基本优先级下面vb.net里loop的代码示例说明vb.net里loop了更改线程优先级vb.net里loop的结果。创建两个线程vb.net里loop，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vb.net里loop，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 = https://www.04ip.com/post/True
End Sub
WriteOnly Property LoopSwitch As Boolean
Set
loopSwitchValue = https://www.04ip.com/post/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
vb.net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 sumBound
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。
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.NET语句中continue while的用法VB.NET
2005,已经实现了continue语法，具体是这样操作：
如果
Continue
语句在
Do...Loop
循环中，请将该语句更改为
Continue
Do 。
如果
Continue
语句在
For...Next
循环中，请将该语句更改为
Continue
For 。
如果
Continue
语句在
While...End
While
循环中，请将该语句更改为
Continue
While 。
否则，请移除
Continue
语句。
用法：
For
i
As
Integer
=
To
100
'
If
i
=
50
跳过
Console.Writeline
statement
If
i
=
50
Then
Continue
For
Console.WriteLine(i.ToString)
Next
'
Do
While
using
Continue
statement.
Dim
ii
As
Integer
=
1
Do
While
ii
100
ii
=
1
'
If
ii
=
50
跳过
Console.Writeline
statement
If
ii
=
50
Then
Continue
Do
Console.WriteLine(ii.ToString)
Loop
'
While
using
Continue
statement.
Dim
iii
As
Integer
=
1
While
iii
100
iii
=
1
'
If
iii
=
50
跳过
Console.Writeline
statement
If
iii
=
50
Then
Continue
While
Console.WriteLine(iii.ToString)
End
While
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vb.net里loop的简单介绍

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