c# event handler is called multiple times when event is raised once

Question

Below is my code, first is where I raise the event and second section is where I consume it in another class. It seems pretty straight forward, but the logs are showing that

Answer 1

How many times is this being called? If this gets called multiple times then your event will be called multiple times.

 ibSerialPort.OnPacketReceived += ibSerialPort_OnPacketReceived;

As a test, you could remove the delegate just before you add it:

ibSerialPort.OnPacketReceived -= ibSerialPort_OnPacketReceived;
ibSerialPort.OnPacketReceived += ibSerialPort_OnPacketReceived;