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説明
Description
The SerialPort seems to be broken in .NET 9. It throws this exception all the time: System.IO.IOException: "The I/O operation has been aborted because of either a thread exit or an application request."
This code has worked wonderfully in older versions of .NET but now it only fails. I can read and write from the serial port synchronously, i.e. wait for a response after sending a request. But for this project I need constant awareness on the port to always handle incoming data.
See attached demo code that reproduces the bug immediately. SerialPort is unusable like this. Run the project with the name of a serial port as only command line argument.
Reproduction Steps
Run attached code.
Expected behavior
Reading whatever bytes have been received.
Actual behavior
System.IO.IOException: "The I/O operation has been aborted because of either a thread exit or an application request."
Regression?
I think so.
Known Workarounds
None
Configuration
.NET 9 Windows 11 x64 Not tested anything else
Other information
The web suggests that something is tampering with the serial port. But that's not the case. I can verify with PuTTY that the serial port is working fine and receiving data. I can also send data over the port from .NET (ignoring these exceptions) and the data is properly received on the other end. I just can't receive any of the data that is sent, and I have these exceptions in a very tight loop.