AddChartIndicator Using Indicator with a Custom Type Convertor

[TheTradingMantis]

I have several indicators that have a custom TypeConvertor. When I add the one of these indicators to a strategy using AddChartIndicator and then open up the indicator properties window, I get an "object not set to an instance of an object" error. I have been able to identify the issue is because all the items in the PropertyDescriptorCollection are null. I assume this is happening because only the plot properties are included in the properties dialog when using AddChartIndicator.

I am able to resolve the issue by iterating over the PropertyDescriptorCollection and checking if any item is null, before returning the PropertyDescriptorCollection.

foreach (var item in propertyDescriptorCollection)
{
  if (item == null) return null;
}

return propertyDescriptorCollection;

I thought you might want to include something in the help guide on TypeConvertors that warns other users of this potential issue and the way to address it.

Thanks, Greg

[NinjaTrader_Jim]

Hello Greg,

Thanks for your suggestion.

I'll see if we can fit a note into the existing sample.