vb.net随机数刷新,excel生成随机数

vb.net 窗体自动刷新的问题

我的做法是先写入一个图片变量，然后再写入到容器上。容器设置双缓冲

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还有你说的控件必须透明不太明白，可以直接在容器上绘图，不需要控件，图片的透明度可以用RGBA色的A值（透明度）来控制

我这个也是实时翻滚刷新的，不会闪！

vb.net 产生随机数问题

不用那么麻烦吧，利用Random实现.

Dim a As Integer

Dim r As New Random

a = r.Next(4, 99)

vb.net产生随机数

方法名称：next()；功能描述：返回一个0~2147483647之间的整数

方法名称：next(i)；功能描述：返回一个0~i之间的整数

方法名称：next(i，j)；功能描述：返回一个i~j之间的整数

方法名称：Nextdouble()；功能描述：返回一个0~1之间的随机小数

================

使用方法：

Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click

Dim rand = New System.Random()

MsgBox(rand.next().ToString())

End Sub

==========================

产生N个不同数的话，我给你个我写的VB的代码，你稍微改下：

产生0-10的数：

Private Sub Command1_Click()

Randomize

Dim a(10) As Long

n = 10

For i = 0 To n

a(i) = Int(Rnd() * (n + 1))

For j = 0 To i - 1

If a(i) = a(j) Then

i = i - 1

Exit For

End If

Next

Next

For i = 0 To n

Print a(i)

Next

End Sub

VB.NET设置屏幕分辨率、颜色位数、刷新率 实例代码

这篇文章介绍了VB.NET设置屏幕分辨率、颜色位数、刷新率

实例代码，有需要的朋友可以参考一下

复制代码

代码如下:

Private

Declare

Function

GetDeviceCaps

Lib

"gdi32"

(ByVal

hdc

As

Long,

ByVal

nIndex

As

Long)

As

Long

Private

Declare

Function

ChangeDisplaySettings

Lib

"user32"

Alias

"ChangeDisplaySettingsA"

(lpDevMode

As

Any,

ByVal

dwflags

As

Long)

As

Long

Private

Const

CCDEVICENAME

As

Long

=

32

Private

Const

CCFORMNAME

As

Long

=

32

Private

Const

DM_BITSPERPEL

As

Long

=

H40000

Private

Const

DM_PELSWIDTH

As

Long

=

H80000

Private

Const

DM_PELSHEIGHT

As

Long

=

H100000

Private

Const

DM_DISPLAYFLAGS

As

Long

=

H200000

Private

Const

DM_DISPLAYFREQUENCY

=

H400000

Private

Const

CDS_FORCE

As

Long

=

H80000000

Private

Const

BITSPIXEL

As

Long

=

12

Private

Const

HORZRES

As

Long

=

8

Private

Const

VERTRES

As

Long

=

10

Private

Const

VREFRESH

=

116

Private

Type

DEVMODE

dmDeviceName

As

String

*

CCDEVICENAME

dmSpecVersion

As

Integer

dmDriverVersion

As

Integer

dmSize

As

Integer

dmDriverExtra

As

Integer

dmFields

As

Long

dmOrientation

As

Integer

dmPaperSize

As

Integer

dmPaperLength

As

Integer

dmPaperWidth

As

Integer

dmScale

As

Integer

dmCopies

As

Integer

dmDefaultSource

As

Integer

dmPrintQuality

As

Integer

dmColor

As

Integer

dmDuplex

As

Integer

dmYResolution

As

Integer

dmTTOption

As

Integer

dmCollate

As

Integer

dmFormName

As

String

*

CCFORMNAME

dmUnusedPadding

As

Integer

dmBitsPerPel

As

Integer

dmPelsWidth

As

Long

dmPelsHeight

As

Long

dmDisplayFlags

As

Long

dmDisplayFrequency

As

Long

End

Type

Private

Sub

cmdChangeDesktopMode_Click()

Dim

DM

As

DEVMODE

With

DM

.dmPelsWidth

=

CInt(txtNewWidth.Text)

.dmPelsHeight

=

CInt(txtNewHeight.Text)

.dmBitsPerPel

=

CInt(txtNewColor.Text)

.dmDisplayFrequency

=

CInt(txtNewFreq.Text)

.dmFields

=

DM_PELSWIDTH

Or

DM_PELSHEIGHT

Or

DM_BITSPERPEL

Or

DM_DISPLAYFREQUENCY

.dmSize

=

LenB(DM)

End

With

If

ChangeDisplaySettings(DM,

CDS_FORCE)

Then

MsgBox

"错误!不支持此模式！"

End

If

End

Sub

Private

Sub

Form_Load()

txtOldWidth.Text

=

GetDeviceCaps(Me.hdc,

HORZRES)

txtOldHeight.Text

=

GetDeviceCaps(Me.hdc,

VERTRES)

txtOldColor.Text

=

GetDeviceCaps(Me.hdc,

BITSPIXEL)

txtOldFreq.Text

=

GetDeviceCaps(Me.hdc,

VREFRESH)

End

Sub

VB.NET中怎么实现每单击一次按钮，文本框就多出现一个1-13的随机数字？

Dim n As Integer, b As Integer, a(13) As Integer

Private Sub Command1_Click()

If b 5 Then

b = b + 1

x = Int(n * Rnd()) + 1

Text1.Text = Text1.Text a(x) " "

a(x) = a(n)

n = n - 1

Else

Call Form_Load

End If

End Sub

Private Sub Form_Load()

Randomize

n = 13: b = 0

For i = 1 To 13

a(i) = i

Next i

Text1.Text = ""

End Sub

VB.NET中,随机数生成器问题

Public Shared Sub Randomize ([ Number ])

Randomize 用 Number 将 Rnd 函数的随机数生成器初始化，并给它一个新的种子值。如果省略 Number，则用系统计时器返回的值作为新的种子值。