Importing an element from a public variable

[Shansen]

NT Team,

I've a situation where an indicator produces a generic integer list as a public variable, another indicator calls this public variable and sets a generic integer list private variable to equal the public variable. The indicator then works with the elements of the private variable.

Is it possible to call the integer in [0] of the generic list public variable and set a private integer variable to equal the integer in [0] of the public variable?

Thanks and regards
Shannon

[Zeos6]

Hi Shansen,

I am not sure what is the exact issue you are having here. I use lists often and there are no problems. This should be relatively easy to do. Perhaps if you send a code snippet I may be able to help better.

Generally speaking myList[0] retrieves the first or zero value so

int myIntValue = myList[0];

should work for you unless I am missing the nature of the issue here. Hope this helps.

[Shansen]

Zeos6,

Thanks for your reply.

I agree with your point, and this approach works as expected. However, as this element is called from another indicator, I have tried to ensure the other indicator is "run" to ensure the public variable is correct before calling the variable (as in the commented out portion in the properties section of the code below). The issue is with this commented out code.

    #region Variables
      private int iCurrentPeak;  
    #endregion
    
    protected override void Initialize()
    {
      iCurrentPeak = (int)SPTs(false, sTMA).ICurrentPeaks[0];               
    }

    #region Properties
//    [Browsable(false)]  
//    [XmlIgnore()]    
//    public List<int> ICurrentPeaks
//    {
//      get { Update(); return iCurrentPeaks; } 
//    }    
    #endregion

Any ideas would be much appreciated.

Regards
Shannon

[Zeos6]

Hi Shannon,

One way you can achieve what you are after is using event driven programming with a single cast delegate and an event handler. I will try to put together a code sample for you.
I also had a thought that this could be done in a simpler manner. Why not create a bool variable in the indicator you need to execute first, say bool indicator1Flag, and expose that bool variable to the second indicator. Then use a simple

if(!indicator1Flag) return; at the start of indicator 2 code.

The real issue is whether you need the 2nd indicator to force the first indicator to run.

[Shansen]

Zeos6 & NT Team,

Please confirm my understanding of the update() method:

Indicator "A" publishes several public variables (in the below example ICurrentPeaks represents one of the public variables). Indicator "B" calls these variables from "A" and uses the Update() method in its properties section, as below.

public List<int> ICurrentPeaks
{
  get { Update(); return iCurrentPeaks; } 
}

Does the Update() method effectively update ALL public variables published by indicator "A"?

Regards
Shannon

[NinjaTrader_Austin]

Shannon, you will need Update() in each public variable you're accessing/want updated.

[Zeos6]

Hi Shannon,

My understanding is that Update() forces synchronization. I am not sure whether it will do what you want because it is near impossible to sequence thread execution or processing execution which is what I believe you are looking for (unless I am really missing the boat here). I am concerned that using Update() may not guarantee that indicator 1 was executed before it is accessed by indicator 2 which is what I believe you are looking for. In any case try it and see if it works for you.

If you need to ensure that indicator 1 is executed first before it is accessed by indicator 2, I would push a flag from indicator 1 to 2 (and use Update() on the flag variable) and then use an if statement to ensue that the public variable in indicator 2 is accessed only if the flag from indicator 1 is true. Let me know how it goes. If that does not work then we're into delegates, but I am rying to avoid the complexity. Hope this helps.