Question

I have a winform application. Every few seconds I check some log files, read in any new data and insert any new data into a DB.

When I run the application for around an hour 1/2, I get a StackOverflowException. There was no new data in the log files for that entire period, so nothing new was added to the DB.

The code errored here…

if (pictureBox == null)
{
    continue;
}

if (pictureBox.InvokeRequired)
{
    var toolTip = new ToolTip();
    GameServer tempGameFile = gameServer;
    pictureBox.Invoke(new MethodInvoker(
        () => toolTip.SetToolTip(pictureBox,
            string.Format(
                "{0} : Last Checked: {1}; Last Updated: {2}",
                tempGameFile.Name,
                tempGameFile.CheckedOn.ToLongTimeString(),
                tempGameFile.UpdatedOn.HasValue
                    ?
                        tempGameFile.UpdatedOn.Value.ToLongTimeString()
                        : "-No Date Set-"))));
}
pictureBox.Image = Resources.RedButton;

and the pictureBox.Invoke(..) is throwing that error.

So .. i’m not sure how I can bebug this to figure out what is going on? Any suggestions?

UPDATE

Trying the suggestions of Dmitry I’ve started an ANTS profiler memory profile .. and having a quick look at things .. there seems to be a lot of instances of ToolTip controls.

This is a class list summary after 20 mins.

Lots of EventHandlers (am I not releasing something?)

And there’s a few ToolTips also…

Here is a screenshot of all the instances and here is a screenshot of a single ToolTip control graph/map .. which I don’t know how to read blush

Answer 1

You have 2 potential issues with your code:

var toolTip = new ToolTip();

and

pictureBox.Image = Resources.RedButton;

are both called on non-UI thread. I have to marshal this code to UI thread using Control.Invoke. If fixing this does not help, look at my answer on how to debug StackOverflowException in windows service.

UPDATE: try this code. Note that every statement that references any UI control needs to be marshaled using Control.Invoke:

if (pictureBox == null || !pictureBox.IsHandleCreated) {
    continue;
}

Action setTooltipAndImage = () => {
    var toolTip = new ToolTip();
    GameServer tempGameFile = gameServer;
    toolTip.SetToolTip(pictureBox, string.Format(...));
    pictureBox.Image = Resources.RedButton;
};

if (pictureBox.InvokeRequired) {                        
    pictureBox.Invoke(setTooltipAndImage);
} else {
    setTooltipAndImage();
}

It might worth reading Manipulating Controls from Threads.