i am trying to use this SerialPort component of .NET 2.0 framework in a
very simple windows application and i am getting following exceptions:

A first chance exception of type 'System.ArgumentOutOfRangeException'
occurred in System.dll
A first chance exception of type 'System.IO.IOException' occurred in
System.dll

with the exception message:

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


in the code, i use an eventhandler to receive incoming data as follows:

private void Form1_Load(object sender, EventArgs e)
{
    serialPort1.DataReceived += new
SerialDataReceivedEventHandler(serialPort_DataReceived);
}

private void serialPort_DataReceived(object sender,
SerialDataReceivedEventArgs e)
{
    textBoxReceived.Text = serialPort1.ReadLine();
}


as i have said, it is very simple and fundemantal. although i checked
every property of my comm port etc., i could not find the reason.

would be grateful for any kind of help...

You cannot assign data directly to a textbox in the DataReceived event.  You
assign it to a string buffer, then call a delegate to assign that buffer to
the textbox.  The DataReceived event is generated in the thread context of
the SerialPort1 object, not the STAThread context of the UI.  Call the
delegate using this.Invoke or this.BeginInvoke.  You can download a VB
example from my web site -- the C# syntax will be (almost) the same.

thanks for your reply Richard, but your suggestion didn't work.

even if i don't assign the read data directly to a textbox, but to a
string buffer (as you've said), i get the same exception just at the
following line:
string buffer = serialPort1.ReadLine();

(error message is: "The I/O operation has been aborted because of
either a thread exit or an application request.")

i should also note that the codepieces i have written in my first post
were taken exactly from an MSDN sample application.

any further suggestions?


Dick Grier wrote:
Show quoteHide quote

Windows service timeout
DateTime.Now.ToString("t") not printing what I expect
Bug in C# compiler
Nested Iterators & C# 3.0 yeilds problems?
Addition error in DotNet 2.0