Object reference not set to an instance of an object.

[LuxSpuzy]

I've made a class with a simple function for now, but when I try to use that function, I get Object reference not set to an instance of an object. error
posted a screenshot of the code and the error.
My question is how can I make my own class of functions and then use that in my indicators, can I also make the class in one indicator, and use it in all of the other indicators without the need for the one containing the classes being active on the chart?

[NinjaTrader_ChelseaB]

Hello LuxSpuzy,

You can use a partial class of the Indicator class in a separate file to make a class available to all indicators.

Below is a link to an example.
https://ninjatrader.com/support/foru...ow#post1142340

In your script you have ta declared as the type pine, but the ta variable is never instantiated as a new object instance of the pine class. So this is an empty variable holding no object.

You need to instantiate the ta variable.

else if (State == State.DataLoaded)
{
    ta = new pine();
}

[LuxSpuzy]

Thank you very very much

[LuxSpuzy]

if I try to export my files that use functions from the partial class files I get an error

The type or namespace name 'pine' could not be found (are you missing a using directive or an assembly reference?)

I've tried to do "using" but I guess I've used it wrongly

EDIT: I've managed to make it work by making a new directory in Indicators named Pine, then I do

using NinjaTrader.NinjaScript.Indicators.Pine;

and the file inside that folder has to be named the same as the class inside it.

and now the indicator works and I can export it correctly as well.

but now I have

        protected pineLib pine;​

        else if (State == State.DataLoaded)
        {
            pine = new pineLib();
        }

        double ph = pine.pivothigh(High,5,5,CurrentBar);​​

but how can I now make a sub class inside so that I can have my functions organized better for example

        protected pineLib pine;​

        else if (State == State.DataLoaded)
        {
            pine = new pineLib();
        }

        double ph = pine.ta.pivothigh(High,5,5,CurrentBar);​​
        double max= pine.math.max(1,2);​​​

how can I make it so I have ta and math subclasses (not sure if that is called a subclass or what but I think you get the point of my question?)

[NinjaTrader_ChelseaB]

Hello LuxSpuzy,

To confirm, you've made a partial class of the Indicator class correct? (So that your class is available to all Indicators)

Make sure you add the file with the partial class to your export. Check the boxes for the partial class file and your indicator file.

In your custom class you can have further classes.

namespace NinjaTrader.NinjaScript.Indicators
{
    public partial class Indicator
    {
        public class PineLib
        {
            public MyInnerClass InnerClassInstance;

            public PineLib()
            {
                InnerClassInstance = new MyInnerClass();
            }

            public class MyInnerClass
            {
                public MyInnerClass()
                {
                    DoubleValue = 5.1;
                }

                public double DoubleValue;

                public double DoubleMethod()
                {
                    return 6.2;
                }
            }
        }
    }
}

private PineLib pine;

pine = new PineLib();
Print(pine.InnerClassInstance.DoubleValue);

[LuxSpuzy]

thank you, that works
but now I can't use the function CrossAbove inside my functions inside the class

I get the error
"Cannot access a non-static member of outer type 'NinjaTrader.NinjaScript.NinjaScriptBase' via nested type 'NinjaTrader.NinjaScript.Indicators.Indicator.pine Lib.TechnicalAnnalysis"

sorry for so many questions, I am new to C# and learning still

[NinjaTrader_ChelseaB]

Hello LuxSpuzy,

As you are not placing the methods in the Indicator partial class, you will need to supply your indicator instance to the sub class if you want to use methods and properties from the indicator base.

namespace NinjaTrader.NinjaScript.Indicators
{
    public partial class Indicator
    {
        public class PineLib
        {
            public MyInnerClass InnerClassInstance;

            public PineLib(NinjaScriptBase thisOwner)
            {
                InnerClassInstance = new MyInnerClass(thisOwner);
                thisOwner.Print("hello");
            }

            public class MyInnerClass
            {
                private NinjaScriptBase owner;
                public MyInnerClass(NinjaScriptBase thisOwner)
                {
                    DoubleValue = 5.1;
                }

                public double DoubleValue;

                public double DoubleMethod()
                {
                    if (owner.CrossAbove(owner.Close, owner.Open, 1))
                        owner.Print("crossed above");
                    return 6.2;
                }
            }
        }
    }
}​

Do you need these to be classes or is this just for organizing methods?

With the class do you an instance of the class because it going to store values or are you just needing to call methods?

While static classes and methods would be technically unsupported, it might be what you need.

Below is a link to an example.

https://ninjatrader.com/support/forum/forum/historical-beta-archive/version-8-beta/83018-partial-class-does-not-work#post712245

[LuxSpuzy]

ah okay, I kinda understand, it works now, I've put this in the class constructor, it works and hope this is fine

public TechnicalAnalysis(NinjaScriptBase thisOwner)
{
    owner = thisOwner;
}​

just for organizing methods, I'm trying to make a library of pine functions so that converting will be easier
just for calling the methods, won't be storing any values within the classes