文本框不会在主窗口WPF上更新

我有一个从SMS调制解调器截取SMS的程序，然后它将从另一个类更新主窗口上的

文本框

。我的代码是：

主窗口：

Class MainWindow
Public WithEvents SMScon As SMSComms
Private Delegate Sub GetDisplay(ByVal SMS As SMSMessage)

Public Sub GetFromSMSComms(SMS As SMSMessage) Handles SMScon.SMSListChanged
    If tb_recievedmessages.Dispatcher.CheckAccess() Then
        DisplaySMS(SMS)
    Else
        tb_recievedmessages.Dispatcher.BeginInvoke(DispatcherPriority.Normal, New GetDisplay(AddressOf DisplaySMS), SMS)
    End If
End Sub

Private Sub DisplaySMS(ByVal SMS As SMSMessage)
    Debug.WriteLine("Writing To TextBox")
    tb_recievedmessages.Text() = SMS.MessageText
End Sub
End Class

在不同类别中捕获的SMS：

SMSComms.vb：

Public Class SMSComms

   Public Event SMSListChanged(ByVal SMS As SMSMessage)

Private Delegate Sub GetDisplaySMSCallback(ByVal SMS As List(Of String))

Public Sub DataReceivedHandler(sender As Object, e As SerialDataReceivedEventArgs)

    Dim rxString As String
    Dim index As Integer
    Dim newMsg As New SMSMessage

    RemoveHandler SMSPort.DataReceived, AddressOf DataReceivedHandler

    Thread.Sleep(100)
    rxString = SMSPort.ReadExisting()
    rxString = TrimCRLF(rxString)

    index = NewSMSIndex(rxString)
    If index > -1 Then

        newMsg = ReadSMS(index)
        If newMsg.Index > -1 Then


            AddHandler SMSListChanged, AddressOf Main.GetFromSMSComms

            RaiseEvent SMSListChanged(newMsg)


        End If

    End If
    RemoveHandler SMSListChanged, AddressOf Main.GetFromSMSComms
    AddHandler SMSPort.DataReceived, AddressOf DataReceivedHandler

End Sub
End Class

现在SMS对象从SMSComms类传递到主窗口，我使用Dispatcher.BeginInvoke（）调用主线程，但当它到达写入textbox的子线程时，textbox不会在主UI上更新

---

谁能告诉我为什么？？或者如何使其更新？？？

您是否设置了一些断点并逐步通过？你的留言正确吗？消息是否为空，因此文本框是否正确？textbox.text不是属性吗

tb_receivedMessages.Text（）=blah

对我来说似乎不对。我的朋友，你的代码太多了。请阅读此页以了解如何减少它，然后请编辑您的问题以实现此目的。顺便说一句，在您使用WPF编写一行代码之前，请先学习MVVM。发送到tb_ReceivedMessages.Text（）的消息是正确的SMS。Messagetext是字符串，所以我不明白它为什么不写信给textbox@JohnGardnerVisual Basic允许在属性设置器上使用参数