vb.net线程委托传参 vbnet 多线程

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 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中的多线程和委托是什么关系? 能不能给我一个通俗易懂的范例,谢谢

委托，Delegate

就是让你处于这个线程里时，委托另一个线程去执行一些动作

我简单举一个写richtextbox的例子：

////////////////////////////////////////////

'创建一个名为 MySubDelegate 的委托。

Delegate Sub MySubDelegate(ByVal txt As String)

'写信息到富文本主窗口

Private Sub txtW(ByVal txt As String)

Dim msgd As New MySubDelegate(AddressOf Me.txtW1)

Dim arg(0) As Object

arg(0) = txt

Me.Invoke(msgd, arg)

End Sub

'委托指向

Private Sub txtW1(ByVal txt As String)

Me.RichTextBox1.AppendText(txt)

End Sub

/////////////////////

这样，你在多线程应用时，在其他线程里用txtW(str)来写richtextbox，就不会产生错误了。不然，直接垮线程写richtextbox，可能会出现和UI线程的冲突。

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