vb點(diǎn)虐 如何傳遞類(lèi)參數(shù)

線程結(jié)束后利用委托生成事件返回，線程應(yīng)用包括傳銀和叢入鋒櫻和傳出棚液參數(shù)。

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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 = "測(cè)試"

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點(diǎn)虐 兩個(gè)窗體之間傳遞參數(shù)

新窗體中寫(xiě)

構(gòu)造函數(shù)

，然后調(diào)用。

比如你要調(diào)用的新窗體手耐是From1.cs這個(gè)窗體，

public

Form1(要傳入的參數(shù))

{

//把傳入的參數(shù)者枯傳入窗體中畢嫌春

//執(zhí)行窗體標(biāo)準(zhǔn)內(nèi)容

}

然后在需要調(diào)用的地方調(diào)用

Form1

f

=

new

Form1(傳出的參數(shù));

'--------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();

如此就能實(shí)現(xiàn)調(diào)用了。

關(guān)于VB.NET中-引用類(lèi)型參數(shù)傳遞的問(wèn)題

1.對(duì)象變量與對(duì)象本身是不同的，對(duì)象變量代表了對(duì)象真實(shí)數(shù)據(jù)在內(nèi)存中的地址仿悄明.

打個(gè)比方，“對(duì)運(yùn)圓象變量”就象你家的地址，“對(duì)象本身”就象你家。

你不能說(shuō)你家的地址(xx路xx號(hào)xx房)就是你家，但是可以通過(guò)這個(gè)地址而找到你家。

2.傳值的參數(shù)本身是被復(fù)制一份的，但這并不意味著它所代表的對(duì)象也被復(fù)制一份.

有如下一個(gè)函數(shù):

Public

Function

Do_delete(ByVal

ps_usr_id

As

String)

As

Boolean

你在調(diào)用時(shí)可能這樣調(diào)用:

dim

strID

as

string

strID

=

"kknd001"備告

if

Do_delete(strID)

then.....

當(dāng)程序執(zhí)行到Do_delete函數(shù)體里面時(shí)ps_usr_id變量其實(shí)是按照StrID的值而復(fù)制的一個(gè)變量。