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POSerialPort reading cause error because of not owning thread
 

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    <p>I have a simple WPF windows application trying to read a serial port with the <code>System.IO.Ports.SerialPort</code>. </p> <p>When I try to read the incoming data in the <code>DataReceived</code> event, I get an exception saying that I don't have access to the thread. How do I solve it?</p> <p>I have this in the WPF window class:</p> <pre><code>Public WithEvents mSerialPort As New SerialPort() Private Sub btnConnect_Click(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs) Handles btnConnect.Click With mSerialPort If .IsOpen Then .Close() End If .BaudRate = 4800 .PortName = SerialPort.GetPortNames()(0) .Parity = Parity.None .DataBits = 8 .StopBits = StopBits.One .NewLine = vbCrLf .Open() End With End Sub Private Sub mSerialPort_DataReceived(ByVal sender As Object, ByVal e As System.IO.Ports.SerialDataReceivedEventArgs) Handles mSerialPort.DataReceived If e.EventType = SerialData.Chars Then txtSerialOutput.Text += mSerialPort.ReadExisting() End If End Sub Protected Overrides Sub Finalize() If mSerialPort.IsOpen Then mSerialPort.Close() End If mSerialPort.Dispose() mSerialPort = Nothing MyBase.Finalize() End Sub </code></pre> <p>When the <code>DataReceived</code> event triggers, I get the following exception on <code>mSerialPort.ReadExisting()</code> :</p> <pre><code>System.InvalidOperationException was unhandled Message="The calling thread cannot access this object because a different thread owns it." Source="WindowsBase" StackTrace: at System.Windows.Threading.Dispatcher.VerifyAccess() at System.Windows.Threading.DispatcherObject.VerifyAccess() at System.Windows.DependencyObject.GetValue(DependencyProperty dp) at System.Windows.Controls.TextBox.get_Text() at Serial.Serial.mSerialPort_DataReceived(Object sender, SerialDataReceivedEventArgs e) in D:\SubVersion\VisionLite\Serial\Serial.xaml.vb:line 24 at System.IO.Ports.SerialPort.CatchReceivedEvents(Object src, SerialDataReceivedEventArgs e) at System.IO.Ports.SerialStream.EventLoopRunner.CallReceiveEvents(Object state) at System.Threading._ThreadPoolWaitCallback.WaitCallback_Context(Object state) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) at System.Threading._ThreadPoolWaitCallback.PerformWaitCallbackInternal(_ThreadPoolWaitCallback tpWaitCallBack) at System.Threading._ThreadPoolWaitCallback.PerformWaitCallback(Object state) </code></pre>
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