When I change parameter value in strategy settings, I want preselect other values

[kujista]

Hi,

is it possible when I change value of 1 parameter in strategy settings to set other values to predefined values? so i do not need to do this manually? I want to change value on top, and when i do so, it will change values of other fields..

[NinjaTrader_ChrisL]

Hello, thanks for writing in. The best example to study will be the type converter example:

https://ninjatrader.com/support/helpGuides/nt8/NT%20HelpGuide%20English.html?using_a_typeconverter_to_custo.htm

Referencing Use case 1, in public class MyConverter notice the use of PropertyDescriptorCollection, which gets all the properties of the attached class (in this case, the indicator object you want to modify its properties) and the use of PropertyDescriptor which will let you change the properties value. See the C# documentation for PropertyDescriptor here:

https://learn.microsoft.com/en-us/do...r?view=net-7.0

Kind regards,
-ChrisL

[kujista]

Hi Chris I am afraid the first link does not work :-/

[NinjaTrader_ChrisL]

I fixed it, sorry the forum likes to put a space in my links when I paste them in.

[kujista]

Cool I already get to all properties, can i access only my custom properties? not all that strategy has?

[kujista]

I do not have list of properties. Anyway I found a way.
can I access to value ResourceType?

        [Display(ResourceType = typeof(Custom.Resource), Name = "Session A Begin", GroupName = filterTradingTimeGroup, Order = filterTradingTimeOrder + 2)]
        [Description("Počáteční čas seance")]
        public TimeSpan FilterTTSessionABegin {
            get { return tFilterTTSessionABegin; }
            set { tFilterTTSessionABegin = value; }
        }
​

I gues If i access ResourceType and it equals to Custom.Resource i would have it

[NinjaTrader_ChrisL]

Hi, I changed the Type Converter example that I linked above in the "Use Case 1" portion of the MyConverter class to change other integers based on the value of another integer:

    public class MyConverter : IndicatorBaseConverter // or StrategyBaseConverter
    {
        public override PropertyDescriptorCollection GetProperties(ITypeDescriptorContext context, object component, Attribute[] attrs)
        {
            // we need the indicator instance which actually exists on the grid
            SampleIndicatorTypeConverter indicator = component as SampleIndicatorTypeConverter;

            // base.GetProperties ensures we have all the properties (and associated property grid editors)
            // NinjaTrader internal logic determines for a given indicator
            PropertyDescriptorCollection propertyDescriptorCollection = base.GetPropertiesSupported(context)
                                                                        ? base.GetProperties(context, component, attrs)
                                                                        : TypeDescriptor.GetProperties(component, attrs);

            if (indicator == null || propertyDescriptorCollection == null)
                return propertyDescriptorCollection;


            #region Use Case #1: Now it's changing integer values based on the value of another integer:

            PropertyDescriptor toggleValue1 = propertyDescriptorCollection["ToggleValue1"];
            PropertyDescriptor toggleValue2 = propertyDescriptorCollection["ToggleValue2"];

            //Important, instead of checking "ShowHideToggle" boolean property, check the value of an int property we added to the SampleIndicatorTypeConverter indicator:
            //[RefreshProperties(RefreshProperties.All)] // Needed to refresh the property grid when the value changes
            //[Display(Name = "IntegerToggle", Order = 1, GroupName = "Use Case #1")]
            //public int IntegerToggle
            //{ get; set; }​
            if (indicator.IntegerToggle == 6)
            {
                toggleValue1.SetValue(indicator, 10);
                toggleValue2.SetValue(indicator, 11);
            }


            #endregion


        }

        // Important: This must return true otherwise the type convertor will not be called
        public override bool GetPropertiesSupported(ITypeDescriptorContext context)
        { return true; }
    }​