Exposing a dictionary

[blarouche]

OK guys

I am fed up with something I've tried to code and it doesn't work.
I definitively need help on that...


I have a dictionary in an indicator that I want to expose to another indicator. I keep on getting the following error :

Object reference not set to an instance of an object...


In my first indicator I initialize the dictionary in the variables section

private Dictionary<string,List<double>> sup = new Dictionary<string,List<double>>();

In my property I have the following :

[Browsable(false)]
[XmlIgnore()]
public Dictionary<string,List<double>> Sup
{
get { Update(); return sup; }
}



In the second indicator I am trying to get the list of my dictionary like that :

if(MyIndicator().Sup.Count != 0){

foreach(KeyValuePair<string, List<double>> key in MyIndicator().Sup){

List<double> thislist = key.Value as List<double>;

foreach(double item in thislist)

Print(Time[0]+" Mylist item : "+item);
}
}

What am I doing wrong ?


Thanks


Bernard

[NinjaTrader_Josh]

Can you try some try-catch blocks to try and isolate the area of problem? Unfortunately Dictionary use is beyond my scope.

[Ralph]

Hi Bernard,

you could place a print statement after each code line. This way you find out quickly where the exeption is thrown. Both, dictionaries and lists, accept null-values. Make sure that does not happen or test for null-values before usage.

Regards
Ralph

[blarouche]

Ralph


That's exactly what I did.

I checked for the null conditions , now I don't get an error anymore but it returns nothing. From my other indicator I use a print statement to verify the List Count and it returns 0.

I am just woundering why it is so easy to expose a variable or a DataSeries and so complicated with a list ?

I can't use the Update() method in the get method anymore...


Bernard

[Ralph]

Originally Posted by blarouche

I am just woundering why it is so easy to expose a variable or a DataSeries and so complicated with a list ?

It is as easy as with a simple variable, at least in my own code. I still do not understand what you are are doing. If you pass over an empty dictionary with the property, then you will get an empty dictionary?

Regards
Ralph

[blarouche]

The way my code works is that I have many dictionaries of <int,List<double> that contains Support and resistance levels calculated in one indicator.

The dictionaries get filled at the open of the market ( firstTick of Bar on a 30 minutes Chart CalculateonClose : false).

I need these dictionaries to draw levels on another Chart ( a 1 Minute Chart)

In have created a property in my indicator so that I can send these dictionaries to the indicator that will draw S/R Lines.

In the tests I did, I found out that the dictionaries contains the data and they are good but it seems it doesn't get to the property !


Bernard

[Ralph]

If you put a print statement in the property getter:

public Dictionary<string,List<double>> Sup
{
get { Update(); Print(sup.Count); return sup; }
}

and another one into your other indicator:

Print(Sup.Count);

Do you see the same numbers?

Regards
Ralph

[blarouche]

Ralph

Thank you for trying to get my problem resolved.

I did what you told me to do here is the result :

Error on calling 'OnBarUpdate' method for indicator 'Indicator1' on bar 1 : Object reference not set to an instance od an object.
0
0
0
0
0
0
0
0
0
0


But if I print the dictionary from my indicator1 code I get the lists OK


Bernard

[Ralph]

Only an example installation would help me to understand the context.

Regards
Ralph