The I/O operation has been aborted because of either a thread exit or an application request.

Question

1.00/5 (1 vote)

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C#

try
{
    start_text = serialPort1.ReadByte();
}
catch (Exception err)
{
    MessageBox.Show(err.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
}

What I have tried:

The I/O operation has been aborted because of either a thread exit or an application request.

Posted 4-Sep-20 0:59am

Member 14120682

Updated 4-Sep-20 10:57am

Sandeep Mewara

v2

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CHill60 4-Sep-20 7:34am

Posting guideline #2 "Have you searched or Googled for a solution?" Have you tried this search[^]

Richard MacCutchan 4-Sep-20 8:29am

Probably something in the code that you do not show us.

Luc Pattyn 4-Sep-20 19:08pm

Thanks for your code. Do you have a question?

I do: If you happen to get such an exception, what is it your program is doing at that point? Are you killing a thread, closing the port, exiting the program, or what?

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Sandeep Mewara · Answer 1 · 2020-09-04T10:58:00

Quote:
start_text = serialPort1.ReadByte();

The error mostly will occur if you are trying to read the data when the port is closed. (forgot to open or accidentally got closed)

Make sure you open it in the start (if not doing already):

C#

serialPort1.Open()

Before reading the data, check for the port status:

C#

serialPort1.IsOpen

Look at the example provided here on how to use it: SerialPort Class (System.IO.Ports) | Microsoft Docs[^]