MarketData.GetBarsAsync()

PanagiotisCharalampous
22 Apr 2020, 17:11

Hi Kenneth,

I am not sure what is the problem. The below seems to be working fine for me

            var lbrs = new List<Bars>();
            MarketData.GetBarsAsync(TimeFrame, Symbol.Name, bars =>
            {
                lbrs.Add(bars);
                Print(lbrs.Count + " Bar collection added");
            });

Best Regards,

Panagiotis 

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kenneyy_eur
22 Apr 2020, 17:31 ( Updated at: 21 Dec 2023, 09:22 )

RE:

Hi Panagiotis and thanks for your quick response.

You are able to see something because you added the print line below the collection population line.

If you remove the print line and try accessing the collection below the MarketData.GetBarAsync block. The collection will be empty trust me.

I can add the print line to my code, but i know i need to add the bars to a Task<IEnumerable>  that's where i'm stuck . Once i achieve that, then i'm home and dry.

Deep appreciation for the work you do!

Regards

Kenneth

PanagiotisCharalampous said:

Hi Kenneth,

I am not sure what is the problem. The below seems to be working fine for me

            var lbrs = new List<Bars>();
            MarketData.GetBarsAsync(TimeFrame, Symbol.Name, bars =>
            {
                lbrs.Add(bars);
                Print(lbrs.Count + " Bar collection added");
            });

Best Regards,

Panagiotis 

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PanagiotisCharalampous
22 Apr 2020, 17:40

Hi Kenneth,

It will be empty because that line of code will be executed before the bars are retrieved. That's the whole point of asynchronous execution, to proceed with the execution of the main thread while another task is executed in parallel on the side. Why do you need to use GetBarsAsync() and not just GetBars()?

Best Regards,

Panagiotis 

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kenneyy_eur
22 Apr 2020, 17:53

RE:

PanagiotisCharalampous said:

Hi  again,

I have learnt something new thanks to you. 

My market scanner has to scan over 70 symbols and for each symbol it has to load the bars for 5 timeframes i.e 70 X 5  = 350 iterations = 52 seconds (synchronously)

A lot of time.

Ok, never mind and thanks for your help. I will go digging and find the right way to implement this without the Print line.

Regards

Kenneth

Hi Kenneth,

It will be empty because that line of code will be executed before the bars are retrieved. That's the whole point of asynchronous execution, to proceed with the execution of the main thread while another task is executed in parallel on the side. Why do you need to use GetBarsAsync() and not just GetBars()?

Best Regards,

Panagiotis 

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