vb.net跨线程传值 c# 跨线程调用窗体

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

相关问答

Q1: vb.net 窗体之间怎么传值

方法很多，vb.net很简单的比如： Form2窗体的Textbox2属性设置为public，在Form1点击button1.

Dim frm As New Form2

frm.TextBox2.Text = "123"

frm.ShowDialog() 可以取到form1里面窗体传的值

还有一种方法：From1 ：

Dim frm As New Form2

frm.Owner = Me

frm.ShowDialog()

from2 : Private frmParent As Form1

frmParent = Me.Owner

Me.TextBox2.Text = frmParent.TextBox1.Text

Q2: VB.NET Public Sub 窗体 互相传值

Public Sub checkInjectionWithNoKeyword()

Dim injection_Type As String = My.Forms.SqlInjection.ComboBox_Type.Text.Trim()

Dim my_checkUrl As String = My.Forms.SqlInjection.ComboBox_Url.Text.Trim()

end sub

这个改成放在窗体内就行了，我也有遇到同样的问题，最后只好放窗体里才能实现。

网上找的什么委托都是不行的。

Q3: VB.NET跨线程操作控件

最简单的方法是

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

Control.CheckForIllegalCrossThreadCalls = False'加入这句代码就可以在别的线程访问窗体控件了

End Sub

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