包含vb.net委托参数的词条

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

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Function thename(ByVal imgFrom As Image) As String

thename = imgFrom.Name

End Function

Private Sub Image1_Click()

MsgBox thename(Image1)

End Sub

vb.net 中在模块（module）里如何实现委托

委托三个步骤

1、声明委托 用Delegate 声明一个委托 类型 参数要和 被委托的方法一样 例如 Delegate Function a(byval x as string) as string

2、实例化委托 dim t as new a(AddressOf Function Name)

3.通过 t(参数) 或者 t.Invoke(参数调用委托)

示例：

Module module1

Delegate Function a(ByVal x As Integer, ByVal y As Integer) As Integer '声明委托类型 委托可以使一个对象调用另一个对象的方法

Function sum(ByVal x As Integer, ByVal y As Integer) As Integer

Return (x + y)

End Function

Sub main()

Dim d As New a(AddressOf sum) '实例化委托

Dim s = 0

s = d.Invoke(1, 2) '执行委托

Console.WriteLine(s.ToString())

s = d(1, 2) '执行委托

Console.WriteLine(s.ToString())

MsgBox("")

End Sub

End Module

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