I have an application I am working on in WPF. It uses a serial port connection. I have created a class that wraps the serial port connection and manages buffers, etc.

I developed it when writing a C# WinForms application (.NET6). To allow the serial port events to update a textbox on the main form and send received bytes to a packet handler, I created a delegate and used BeginInvoke to run it. It worked just fine.

I took the same wrapper and included it in a new WPF application, without the textbox updates/packet handler included just to get started (so, only sending bytes out). It also ran fine. I uncommented the receive part of the wrapper, and all still compiles fine (but of course without code on the main form the incoming bytes were not being processed).

When I added the code to the main form to invoke the delegate, I got compile errors. At first, I thought it was a .NET6/.NET8 thing, but I opened the old project and changed the target .NET and it still ran fine.

So, I’m wondering if it’s a WinForms vs. WPF thing. The error is:

CS1501 No overload for method ‘BeginInvoke’ takes 3 arguments

Yet, the exact same code compiles and runs in the old project.

Here is the code in question:

    void ProcessRecievedByte_Callback(object sender, byte rcvdByte)
    {
        this.BeginInvoke(new ES_UART.RxBufferRemoveByteEventHandler(ES_RxBufferProcessor), sender, rcvdByte);
    }

    void ES_RxBufferProcessor(object sender, byte e)
    {
       switch (receiveState)
        {
            case receive_state.WAITING_FOR_SOP:
                if (e == '$')
                {
                    receiveState = receive_state.IN_A_PACKET;
                    packetIndex = 0;
                    packetBuffer[packetIndex] = e;
                    packetIndex++;
                }
                break;
            case receive_state.IN_A_PACKET:
                if (packetIndex < MAX_PACKET_SIZE)
                {
                    packetBuffer[packetIndex] = e;
                    packetIndex++;
                }
                if (e == 'n')
                    receiveState = receive_state.PACKET_RECIEVED;
                break;
            case receive_state.PACKET_RECIEVED:
                break;
        }
    }

Any help would be appreciated.

Thanks