使用多线程 vb.net 时更新文本框

My code

Imports System.IO
Public Class Form1
Dim thread As System.Threading.Thread
Dim thread2 As System.Threading.Thread
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
    thread = New System.Threading.Thread(AddressOf getproxy)
    thread.Start()
End Sub
Private Sub getproxy()
    Try
        Dim ip As String = "76.125.85.66:16805 | 0.238 | Little Rock | AR | Unknown | United States69.207.212.76:49233 | 0.274 | Sayre | PA | 18840 | United States96.42.127.190:25480 | 0.292 | Sartell | MN | 56377 | United States"
        For Each m As Match In Regex.Matches(ip, "(?:\d{1,3}\.){3}\d{1,3}:\d+")
            TextBox1.Text += (m.Value) & vbNewLine
        Next
    Catch ex As Exception
        MsgBox(ex.Message)
    End Try
End Sub

我希望它显示文本框所有代理格式

76.125.85.66:16805
69.207.212.76:49233
96.42.127.190:25480

但它错误

{“跨线程操作无效：从创建它的线程以外的线程访问控制“TextBox1”。”}

一旦启动线程，您就无法从 UI 线程访问控制权。你可以UI 线程并更新文本框。

Private Sub getproxy()
    Dim ip As String = "76.125.85.66:16805 | 0.238 | Little Rock | AR | Unknown | United States69.207.212.76:49233 | 0.274 | Sayre | PA | 18840 | United States96.42.127.190:25480 | 0.292 | Sartell | MN | 56377 | United States"
    Me.Invoke(Sub() 
     For Each m As Match In Regex.Matches(ip, "(?:\d{1,3}\.){3}\d{1,3}:\d+")         
      TextBox1.Text += (m.Value) & Enviroment.NewLine
     Next
               End Sub)
End Sub 

PS 为什么这项工作需要线程？看来这需要很少的时间来执行。线程用于长时间的进程工作。