How to get BarsPeriodType property to pick up non-standard types

[aslane]

I have an indicator that specifies a BarsPeriodType property. All works fine, but it does not pick up any extended bar types when changed in the UI. Can this be done by specifying a typeconverter somehow?

For example:

        [NinjaScriptProperty]
        [Display(Name="Bar Type", Description="Bar Type", Order=2, GroupName="Parameters")]
        public BarsPeriodType BarType { get; set; }

[NinjaTrader_ChelseaB]

Hello aslane,

This code implies you are using dynamic variables with an AddDataSeries() call which is not allowed or supported.

May I confirm this is not being used for an AddDataSeries() call?

Can you clarify what you mean by 'extended bar types'?
Are you talking about classes that are extending another class?
Are you talking about imported 3rd party bar type scripts?

[aslane]

By extended bar types, I just mean user created bar types (with user specified bar period type).

Ok, I see the doc in AddDataSeries. Not supported? That seems rather broken. Really need to add new feature request if it does not exist, as this is rather fundamental for mutli-timeframe studies. Will this work if there is a boolean property that would allow the type to be flipped between two different bar types or would that still be considered dynamic?

Yes, I was using this to load a user configurable data series. However, if this was not the case, can this be done?

[NinjaTrader_ChelseaB]

Hello aslane,

It is supported to use a custom bar type with AddDataSeries(). It is not supported to use dynamic variables with AddDataSeries().

From the help guide:
"Tips
2. You can add a custom BarsType which is installed on your system by casting the registered enum value for that BarsPeriodType. For example: AddDataSeries((BarsPeriodType)14, 10);

3. You can specify optional BarsPeriod values (such as Value2) of a custom BarsType in the BarsPeriod object initializer. For example: AddDataSeries(new BarsPeriod() { BarsPeriodType = (BarsPeriodType)14, Value = 10, Value2 = 20 });"

https://ninjatrader.com/support/helpGuides/nt8/adddataseries.htm

Also from the help guide:
"Arguments supplied to AddDataSeries() should be hardcoded and NOT dependent on run-time variables which cannot be reliably obtained during State.Configure (e.g., Instrument, Bars, or user input). Attempting to add a data series dynamically is NOT guaranteed and therefore should be avoided. Trying to load bars dynamically may result in an error similar to: Unable to load bars series. Your NinjaScript may be trying to use an additional data series dynamically in an unsupported manner."

https://ninjatrader.com/support/helpGuides/nt8/adddataseries.htm

Any property that can be changed is dynamic. A hard coded value that does not change is not dynamic.

[aslane]

So, is there a feature request for this?

Also, there are issues even when it is hard coded, I will open a different thread on that topic.

[aslane]

Also, you did not answer the question on if this can be done in general when not selecting a data series. There are other reasons to want to specify a bar type.

[NinjaTrader_ChelseaB]

Hello aslane,

Are you asking if there is a feature request for making a property of custom bar types?

No, I am not aware of an existing feature request for this.

The BarsPeriodType enum does not have the entries for custom bar types. This is why when adding a custom series with AddDataSeries it must be casted using the bar slot number.

This means you would need to make a custom property and loop through the bar types to populate this custom property.

The use case #3 in the 'Using a TypeConverter to Customize Property Grid Behavior' reference sample shows how to make a drop-down from a List<string>.

https://ninjatrader.com/support/helpGuides/nt8/using_a_typeconverter_to_custo.htm

The Bars Type Identifier demonstrates unsupported code to list the bar types.

https://ninjatraderecosystem.com/user-app-share-download/bars-type-identifier/

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[aslane]

Thanks I was hoping to avoid the type converter, but that does solve the issue.

The feature request should be to "Allow dynamic bar series in AddDataSeries calls". Adding this would be huge win, as it allows doing higher timeframe work in a straight forward manner.

[NinjaTrader_ChelseaB]

Hello aslane,

Yes, the request for the ability to use dynamic variables in AddDataSeries() is being tracked with ID# SFT-882.

[balltrader]

the bars type identifier demonstrates unsupported code to list the bar types.

https://ninjatraderecosystem.com/user-app-share-download/bars-type-identifier/

wow yes yes yes please keep dropping this unsuported code it opens a world of possibility