I am using a.NET 4 SerialPort object to talk to a device attached to COM1. When I am done with the device, I call Close on the SerialPort. I do not call Dispose, but I believe that Close and Dispose are synonymous here.

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Jun 1, 2013 - ObjectDisposedException: Safe handle has been closed. Because of that, since the serial port is a wrapper over native code, there are native. I am receiving data from a device that's sending information over the serial port and I get this exception: 'ObjectDisposedException Safe Handle has been closed'.

Usually this works just fine.

Sean Riddle said. I found this post when searching about a different crash I was getting using SerialPort. I'd heard about this issue before, so I converted your code to C++ and added it to my project. Strangely enough, it seems to have fixed my original issue. I run several serial port data loggers on an XP machine. Some or all of the data loggers would crash about 1/4 of the time that I logged into that PC with remote desktop. I'd get a mystery exception that I could not catch.

I never found any info appropriate to that issue, but I think your workaround fixed it. Hello, and thank you. I've implemented the class as you've written it in the post, and my application seems to be a lot more stable as a result.

I am still having an odd problem closing the serial ports though. My application handles printing from several POS printers connected to multiple com port card(s) to print small tickets for a raffle system and each printer can take 6 or more seconds to close. We have a customer with 14 printers connected and can take as long as 10 minutes for all ports to close on another thread. I can post the closing code if you'd like, but does this sound like it should be expected? Normally I'd keep banging away at this, but I have to admit I'm stumped.

Anonymous said. Zach, I too am having the same issue as ICAO and Dan du Preez. This error does NOT occur if the fix is not included. I have two ports on my computer. One port is used by HyperTerminal (connected, COM1) and another port (COM2) is available. I tried to launch my application but it crashes at this line ' throw new IOException(GetMessage(errorCode), MakeHrFromErrorCode(errorCode));' in function WinIoError() Says IOException was unhandled - Access denied. If I do not include the fix, then my app launches fine.

I can connect to the available port (COM2) just fine. Thank you so much! Anonymous said. I used this fix, and I still had problems. So I continue searching for a solution, and I found one: when you are going to open the port, use the following code: GC.SuppressFinalize(port); port.Open(); GC.SuppressFinalize(port.BaseStream); And, when you close your application or you are going to close the port, use the following code: GC.ReRegisterForFinalize(port.BaseStream); port.Close(); GC.ReRegisterForFinalize(port); For me, this has solved the problem.

Hope this helps more people. Thanks smart Zach. (and others, smart too.). It is really annoying that MS let us all waste our time on their neglect. I have an application with com port that works well for over a year, both read and write.

I added now one small function intended to read back one acknowledge byte from the other serial side. For that I open the port and use Myport.ReadByte(). I can see the byte is present at the port (as seen in debug), but in normal run it always crashes with 'The I/O operation has been aborted because of either a thread exit or an application request.' When running in debug, more often than not it runs OK. Have tried delays and waiting loops, but for no avail. As it looks like this forum thread is just what I need, I tried to add Zach's class, but that class has many of the port properties I already have in my port class, and I am not sure of what the bare minimum I need to leave in Zach's class to test it.

(I naturally moved the call to the class to my program). Please, advice. Thanks to everyone fighting against this problem. I tried the serialportfixer and the GC.SuppressFinalize suggestion, but unfortunately none of them fixed my problem. I still get the exception: 'System.IO.IOException: Ein an das System angeschlossenes Ger채t funktioniert nicht. Nice job on this.

The GC.SuppressFinalize suggestion works in preventing the IO error but causes a worse problem. I have an application running on tablets (Windows 7,.NET Framework 4.) that is GPS enabled. Problem is that users have a tendency to unplug the GPS dongle from the USB port. As soon as they do that, we get the IO error. But using your code and the GC.SuppressFinalize idea, I avoid the IO error, but then basic windows control functions, like form closing, don't work properly (events get fired but form doesn't close). If I remove the GC.SuppressFinalize from my code, the form works just fine (except for the IO error when the user unplugs the GPS device). I'm in a bit of a vicious loop here.