indicators collection

[coffeedan]

Is there a way to get a list of all available indicator by programming ?

It seems there is a IndicatorCollection class , and there is private member of IndicatorCollection in IndicatorBase class .

...

My other question is when is a indicator instantiated (when one of the constructor is called) ? I use the NinjaTrader Chart application , and in that case do all indicators get constructed when a chart runs ?

[NinjaTrader_Tim]

Hi coffeedan,

The intellisense will offer all the accessible indicators
More info at - http://www.ninjatrader-support.com/H...l?Intellisense

You can also reference syntax and most overloads from our help guide
Example at - http://www.ninjatrader-support.com/H...html?Bollinger

When you call an indicator, an instance is created. If you use the same parameters for an indicator, this call is cached so only one instance is used.

If that does not clarify, please explain/clarify further.

[coffeedan]

checking list of indicators at runtime

I just want to check what indicators are available at runtime. For example, if I run the ninjatrader chart application , a user can choose from a list of indicators. So there must be a way to get a list of indicators at runtime (for example , when a chart is running )

And most of all, I want to get the list of selected indicators while I am using a chart and running a custom strategy.

Is there a way inside my strategy class to list the selected indicators ?

[NinjaTrader_JoshP]

coffeedan,

Available indicators are any indicators you have installed on your NinjaTrader. They are always available all the time. Not sure what you mean by "at runtime" for this.

Unfortunately there is no way to access a list of indicators already added onto a chart. If you want to know this I suggest you use a blank chart when you add your strategy and then have the strategy itself add any indicators you want. This way it will only have the indicators your strategy has added and then you will know what is on the chart.

[coffeedan]

then how an application such NT Chart can get the list

How does NT Chart get the list of all Indicators ? Are they all in the same namespaces and are subclass of NinjaTrader.Indicator.Indicator ?

[NinjaTrader_JoshP]

coffeedan,

Unfortunately this is outside the scope of what we can support for NinjaScript.

[xTrader1]

Coffeedan, did you dig anything ? It MUST be a place where NT keeps a data about currently running indicators/strategies.

[Zapzap]

Edit: I didn't see the date, sorry. the forum engine showed it to me as similiar thread.


It is done by the use of reflection. It's quite a good feature of .NET, it is worth the time getting friends with it. If you know how it works, it's not a too complex task to get all indicators.

Like this:

List<Type> defaultIndis = new List<Type>();

Assembly assem = this.GetType().Assembly;
defaultIndis.AddRange(from x in assem.GetTypes()
                         where x.IsSubclassOf(typeof(IndicatorBase)) && !x.IsAbstract && x.IsPublic && x.IsVisible
                         select x); 

The trick here is the GetTypes() which reads all current types from the given assembly. (which is the assembly where "this" - the indicator itself is sitting)

Then you can do whatever you want with them:

foreach(Type it in defaultIndis)
{
      Print(it.ToString());
 } 

Note: it works only for default NT indis. For custom dlls, you'll need to find those assemplies first and read their content too.