C# SerialPort.GetPortNames() behavior

Posted by Gunner on Stack Overflow See other posts from Stack Overflow or by Gunner
Published on 2010-05-02T20:30:20Z Indexed on 2010/05/03 10:58 UTC
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c#

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serial-port

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visual-studio-2008

In my C# 2008 application, I use the SerialPort.GetPortNames() function to retrieve the list of currently available ports. What I have noticed is, when ever I plug in a USB device, it's port number i s shown in the list on my Application and when I unplug it and refresh the list, the port number is no longer there.

One phase of the application involves reading/writing data from/to the device continuously. Now, my expectation is, If I unplug the device during the operation and get the current Port list using SerialPort.GetPortNames(), the Port Name will not be there and I can use that to make the decision that the device has been unplugged.

To my surprise, the Port name is still found despite having it removed

Why is the program behaving like this? The port name isn't listed when in no-communication mode. Does it have something to do with the device being removed when it's communicating?

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