如何对Windows窗体控件进行跨越调用？ [英] how to make cross-theard calls to windows forms control ?

问题描述

这是我的代码，但它不起作用：

this my code but it''s don''t work:

 Imports System.Threading
Public Class Form3
Public UseTherad As New Thread(AddressOf fillcombo)

Private Sub fillcombo()
Dim i As Int64 = 0
Do While i < 100000
Me.combofill.Items.Add(i)
i += 1
Loop
End Sub

Private Sub Form3_FormClosing(ByVal sender As Object, ByVal e As System.Windows.Forms.FormClosingEventArgs) Handles Me.FormClosing
UseTherad.Abort()
UseTherad.Join()
End Sub
Private Sub Form3_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
UseTherad.Start()
End Sub
End Class

推荐答案

有看看：跨线程Winforms访问的通用方法 [ ^ ]



最好的问候

Espen Harlinn

Have a look at: A Generic Method for Cross-thread Winforms Access[^]

Best regards
Espen Harlinn

当然。您不能从非UI线程调用与UI相关的任何内容。相反，您需要使用 Invoke 或 System.Windows.Threading的方法。 Dispatcher （对于Forms或WPF）或 System.Windows.Forms.Control （仅限表单）。



您将在我过去的答案中找到有关其工作原理和代码示例的详细说明：

Control.Invoke（）与Control.BeginInvoke（） [ ^ ]，

使用Treeview扫描仪和MD5的问题 [ ^ ]。



另请参阅有关线程的更多参考资料：

如何让keydown事件在不同的操作上运行vb.net中的线程 [ ^ ]，

在启用禁用+多线程后控制事件未触发 [ ^ ]。

-SA

Of course. You cannot call anything related to UI from non-UI thread. Instead, you need to use the method Invoke or BeginInvoke of System.Windows.Threading.Dispatcher (for both Forms or WPF) or System.Windows.Forms.Control (Forms only).

You will find detailed explanation of how it works and code samples in my past answers:
Control.Invoke() vs. Control.BeginInvoke()[^],
Problem with Treeview Scanner And MD5[^].

See also more references on threading:
How to get a keydown event to operate on a different thread in vb.net[^],
Control events not firing after enable disable + multithreading[^].

—SA

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