I have implemented some custom function operators which work fine. However you are unable to add them to FunctionOperatorHelper because functionInfoStaticDict is not exposed as a Property. This appears to be a bit of an oversight since my functions appear in the expression editor for (say) a CalculatedField in an XAF Report but unlike built in functions, no help or standard template is provided.
If functionInfoStaticDict was exposed as a ReadOnly static property then I would be able to add the relevant help info if I wanted to.
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