Advanced HMI Subscribe有一个指向m_SynchronizingObject的空指针

尝试订阅时出现错误。m_Plc。读取函数工作得很好，但是对于我的应用程序来说太慢了。

这是我的代码:

private AdvancedHMIDrivers.EthernetIPforCLXCom m_Plc;
public MainPageViewModel()
{
   m_Plc = new EthernetIPforCLXCom();
   m_Plc.IPAddress = m_IPAddress;
   m_Plc.ProcessorSlot = Convert.ToInt32(m_ProcessorSlot);
   m_Plc.ComError += DoOnCommError;
   m_Plc.SubscriptionError += DoOnCommError;
   string testString = m_Plc.Read("MyTag");  
   int index = m_Plc.Subscribe("MyTag", 1, 2000, testPlcReaded);
}
private void testPlcReaded(object sender, MfgControl.AdvancedHMI.Drivers.Common.PlcComEventArgs e)
{
    try
    {
        Console.WriteLine(e.Values[0]);
    }
    catch (Exception ex)
    {
        Console.WriteLine(ex);
    }
}

，这是我得到的错误:

m_SynchronizingObject.BeginInvoke (SubscriptionList(我)。dlgCallBack, z)

在文件夹:EthernetIPforCLXCom.vb.

有一个指向m_SynchronizingObject的空指针。

错误细节:

System.NullReferenceException was unhandled by user code
  HResult=-2147467261
  Message=Object reference not set to an instance of an object.
  Source=AdvancedHMIDrivers
  StackTrace:
       at AdvancedHMIDrivers.EthernetIPforCLXCom.DataLinkLayer_DataReceived(Object sender, PlcComEventArgs e) in C:'prj'TLLAB'TLLAB'AdvancedHMIBeta363 (1)'AdvancedHMIDrivers'EthernetIPforCLXCom.vb:line 1269
       at MfgControl.AdvancedHMI.Drivers.CIP.OnDataReceived(PlcComEventArgs e)
       at MfgControl.AdvancedHMI.Drivers.CIP.DataReceivedEIP(Object sender, PlcComEventArgs e)

If m_SynchronizingObject Is Nothing OrElse DirectCast(m_SynchronizingObject, Windows.Forms.Control).IsHandleCreated Then
    '...<some code>...
    m_SynchronizingObject.BeginInvoke(SubscriptionList(i).dlgCallBack, z)
End If

If m_SynchronizingObject IsNot Nothing AndAlso DirectCast(m_SynchronizingObject, Windows.Forms.Control).IsHandleCreated Then
    '...<some code>...
    m_SynchronizingObject.BeginInvoke(SubscriptionList(i).dlgCallBack, z)
Else
    '...<some other code>...
End If

private EthernetIPforCLXCom m_Plc = new EthernetIPforCLXCom
 {
   IPAddress = m_IPAddress,
   ProcessorSlot = Convert.ToInt32(m_ProcessorSlot),
   ComError += DoOnCommError,
   SubscriptionError += DoOnCommError
};