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Event preemption

Hi all,

I am seeing some unexpected behaviour in a single threaded winforms app
and was hoping someone could explain what is going on.
I have two events attached to a chart control on my form, and during
execution one event seems to preempt the execution of the other.

My code looks similar to the following:

private void MyChart_Click(o bject sender, System.EventArg s e)
{
....do some logic tests
GetSomeData();
}

// This event is attached to the context menu for the chart control.
private void DrillDownMenuIt em_Click(object sender, System.EventArg s e)
{
....do stuff
}

private DataSet GetSomeData()
{
....setup tasks
....Call web service
....finish stuff
}

What happens is that when I right click and select drill down from the
chart controls context menu the MyChart_Click event fires and does the
logic tests. Execution then steps into the GetSomeData method, but when
the web service is called execution jumps to the
DrillDownMenuIt em_Click event. This runs to completion then execution
returns to the GetSomeData method which finishes and finally returns to
the MyChart_Click event handler.
Can someone explain why this is so?

Thanks very much,
James

Nov 16 '05 #1
2 1533
James <no**********@m ailinator.com> wrote:
I am seeing some unexpected behaviour in a single threaded winforms app
and was hoping someone could explain what is going on.
I have two events attached to a chart control on my form, and during
execution one event seems to preempt the execution of the other.

My code looks similar to the following:


Rather than similar code, could you post a short but complete program
which demonstrates the problem?

See http://www.pobox.com/~skeet/csharp/complete.html for details of
what I mean by that.

--
Jon Skeet - <sk***@pobox.co m>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too
Nov 16 '05 #2
Hi Jon,

Thanks very much for your reply.

I have figured out the problem myself now. It turns out it is a bug in
the third party control I am using. I am making the vendor aware of the
problem now.
Nice posting guidelines by the way ;-)

Regards,
James Fitzsimons

Nov 16 '05 #3

This thread has been closed and replies have been disabled. Please start a new discussion.

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