vbnet参数 vbs telnet

VB.NET中传递参数有哪些方式?

按值传参byval,和按引用byref

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vb.net里默认是byval,这和vb6不同 :)

vb.net 如何传递类参数

线程结束后利用委托生成事件返回,线程应用包括传入和传出参数。

Public Delegate Sub ThreadCallback(value As ThreadResult)

Public Class Form1

Private WithEvents _th_1 As Thread_1

Protected Overrides Sub OnLoad(e As System.EventArgs)

Dim value As ThreadObject

value.Index = 1

Me._th_1 = New Thread_1(Me)

Me._th_1.Run(value)

MyBase.OnLoad(e)

End Sub

Private Sub Thread_1_End(sender As Object, e As ThreadEventArgs) Handles _th_1.ThreadEnd

Me.TextBox1.Text = e.Result.Text

End Sub

End Class

Public Class Thread_1

Public Event ThreadEnd(sender As Object, e As ThreadEventArgs)

Private _control As Control

Sub New(control As Control)

Me._control = control

End Sub

Public Sub Run(value As Object)

Dim th As New Threading.Thread(AddressOf ThreadProc)

th.Start(value)

End Sub

Private Sub ThreadProc(obj As Object)

Dim value As ThreadObject = CType(obj, ThreadObject)

Dim result As ThreadResult = Nothing

If value.Index = 1 Then result.Text = "测试"

Dim callback As New ThreadCallback(AddressOf ThreadInvoke)

_control.Invoke(callback, result)

End Sub

Private Sub ThreadInvoke(value As ThreadResult)

RaiseEvent ThreadEnd(Me, New ThreadEventArgs(value))

End Sub

End Class

Public Structure ThreadObject

Public Index As Integer

'Public Rect As Rectangle

End Structure

Public Structure ThreadResult

Public Text As String

'Public Rect As Rectangle

End Structure

Public Class ThreadEventArgs

Inherits System.EventArgs

Private _result As ThreadResult

Public ReadOnly Property Result As ThreadResult

Get

Return _result

End Get

End Property

Sub New(value As ThreadResult)

Me._result = value

End Sub

End Class

VB.net 两个窗体之间传递参数

新窗体中写

构造函数

,然后调用。

比如你要调用的新窗体是From1.cs这个窗体,

public

Form1(要传入的参数)

{

//把传入的参数传入窗体中

//执行窗体标准内容

}

然后在需要调用的地方调用

Form1

f

=

new

Form1(传出的参数);

'--------Form1--------

Dim

f2

As

Form2

Private

Sub

Command1_Click()

Set

f2

=

New

Form2

f2.Show

vbModal

End

Sub

'--------Form1

End--------

'--------Form2--------

Dim

WithEvents

f3

As

Form3

Private

Sub

Command1_Click()

Set

f3

=

New

Form3

f3.Show

End

Sub

Public

Sub

f3_f2W()

Me.Command1.Caption

=

"f2W"

End

Sub

'--------Form2

End--------

'--------Form3--------

Public

Event

f2W()

Private

Sub

Command1_Click()

RaiseEvent

f2W

End

Sub

'--------Form3

End--------

f.Show();

如此就能实现调用了。

VB.NET 如何带参数构造函数对象或是类

public structure struc

public name as string

public shengao as integer

……

end structure

public items as struc()

readonly property people(argname as string) as struc

get

for each i as struc in items

if i.name=argname then reture i

next

end get

end property

struc可以用class,property可以用function,people通过参数返回一个对象,对象可以来源于某个数组的某个元素,也可以是其他来源。

people也可以是类的构造方法,而shengao等是类的成员,但你的写法是错误的,构造方法必须用new实例化

如何使用VB.NET中可选参数调用方法

VB.NET可选参数的默认值必须是一个常数表达式。

过程定义中跟在可选参数后的每个参数也都必须是可选的。

下面的语法显示带VB.NET可选参数的过程声明:

Sub sub name(ByVal parameter 1 As data type 1,

Optional ByVal parameter 2 As data type 2 = default value)

调用带VB.NET可选参数的过程

过程在运行时无法检测到给定的参数是否已被省略,或者调用代码是否已显式提供默认值。如果需要弄清楚这一点,可以设置一个不可能的值作为默认值。下面的过程定义了可选参数 office,并测试其默认值 QJZ 以查看它在调用中是否已被省略:

Visual Basic

Sub notify(ByVal company As String, Optional ByVal office As String = "QJZ")

If office = "QJZ" Then

Debug.WriteLine("office not supplied -- using Headquarters")

office = "Headquarters" End If

' Insert code to notify headquarters or specified office.

End Sub

如果可选参数是像 String 这样的引用类型,只要它不是该变量所预期的值,就可以使用 Nothing 作为默认值。

VB.NET可选参数和重载

定义带可选参数的过程的另一种方法是使用重载。如果有一个可选参数,可以定义过程的两个重载版本,一个接受此参数,另一个则不带参数。此方法随可选参数数目的增加而变得更复杂。然而,这样做的优点是可以完全确定调用程序是否提供了每个VB.NET可选参数。

vb.net 给委托的函数传递参数

两个参数:一个是数组名,一个是传递的长度

Function thename(ByVal imgFrom As Image) As String

thename = imgFrom.Name

End Function

Private Sub Image1_Click()

MsgBox thename(Image1)

End Sub


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