StreamWriter and Optimization

[Leeroy_Jenkins]

Hello,
I have a strategy that is used to output some values into a file. I have clean up in State.Terminated for StreamWriter like this:

private StreamWriter sw;

else if(State == State.Terminated)
{
// Necessary to call in order to clean up resources used by the StreamWriter object
if (sw != null)
{
sw.Close();
sw.Dispose();
sw = null;
}
}


End everything work fine in backtest mode but when I try optimization I got error: The process cannot access the file .... because it is being used by another process.
I need this to output optimization variables and my own calculations.

[NinjaTrader_Jesse]

Hello Leeroy_Jenkins,

That would be correct, a backtest is running a single test where an optimization runs many which may overlap. A single file cannot be used by multiple scripts running at once, you would need to write individual files to avoid that.

Please let me know if I may be of further assistance.

[Leeroy_Jenkins]

And it's not possible to run some code at 1st or last iteration, right?

[NinjaTrader_Jesse]

Hello Leeroy_Jenkins,

Not that I am aware of, you would likely need to make unique filenames similar to the example shown in the following post: https://ninjatrader.com/support/foru...85#post1042885

I look forward to being of further assistance.