vb.net - 如何通过不同的线程访问richtextbox

Question

嘿伙计们，我的问题是如何在线程中访问（更新/读取）richtextbox。我刚刚创建了一个非常简单的代码，让您了解我在做什么。我在网上搜索了一些关于invoke、delegate或backgroundworker的文章，希望有人能告诉我哪些以及如何使用。真的感谢。

Imports System.Threading

Public Class form1

Dim flag As Boolean = True
Dim startbtn As Thread
Dim stopbtn As Thread

Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
    startbtn = New Thread(AddressOf startfuction)
    startbtn.Start()
End Sub

Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
    stopbtn = New Thread(AddressOf stopfunction)
    stopbtn.Start()
End Sub

'************** thread 1

Private Sub startfuction()
    flag = True
    While flag = True
        richtextbox1.text = "Your process started"         'error
    End While

End Sub

'************** thread 2
Private Sub stopfunction()
    flag = False
    startbtn.Abort()
    MsgBox("You ended the process")
End Sub

结束类

Answer 1

Imports System.Threading

Public Class Form1

Dim flag As Boolean = True
Dim startbtn As Thread

Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
    startbtn = New Thread(AddressOf startfuction)
    startbtn.Start()
End Sub

Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
    flag = False
    MsgBox("You ended the process")
End Sub

'************** thread 1

Private Sub startfuction()
    flag = True
    While flag = True
        Me.Invoke(Sub() RichTextBox1.Text = "Your process started")         'error
    End While
    Me.Invoke(Sub() RichTextBox1.Text = "Your process stopped")         'error

End Sub
End Class

编辑 1

同样在运行线程时，当您关闭应用程序时，您可能会遇到问题，因为您的线程会过早结束。

做类似的事情

Private Sub Form1_FormClosing(sender As Object, e As System.Windows.Forms.FormClosingEventArgs) Handles Me.FormClosing
    flag = False
    Application.DoEvents()
End Sub