How to avoid File errors using StreamWriter on multiple instrument Backtest

[ours_solaire]

Hi,

I'm trying to collect statistics using StreamWriter and Strategy Analyzer. For a single instrument, all works fine. But I would like to be able to run the strategy on an instrument list, and collect all the resulting data in a single file to save work.

This causes file access errors because NT runs a bunch of the instruments simultaneously.

I am sure there must be a simple way around this problem, but I can't figure it out...

Perhaps some of you crack programmers out there could provide some tips?

Most appreciated!

PS. Im using NT8B10

[NinjaTrader_ChelseaB]

Hi ours_solaire,

As a tip, use a static method that queues things in a list and writes that list to the file line by line (instead of many instances that all try and write simultaneously).

Attached is an example of creating static methods.


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[rayko]

Hello ours_solaire,

If you want a less elegant, but easy-to-implement solution, you could prefix the filename used by StreamWriter with Instrument.MasterInstrument.name for stocks, or name & contract date for futures . This would separate the write operations to separate files and eliminate simultaneous access errors.

Then later manually merge the files together.

[ours_solaire]

Thanks for the tips guys!

rayko: it's exactly this last step of concatenating the files together manually that I want to avoid. If I run this puppy on the NASDAQ100 list, for example, that's quite a lot of merging

ChelseaB: thanks for your offer of support. I will try to sort this out myself, but if I run up against too many more issues, I will contact your support guys. thanks!