DevExpress has finally added the feature we've all been waiting for in 17.2! An expression binding is much more usable than the SummaryField– a single expression can do the job that it used to take multiple SummaryFields and a final CalculatedField to achieve.
Overview
Blog demonstration
Docs
This project is now on track to be deprecated. What you need to know (discussion issue).
Much as I've enjoyed writing this hack, nothing is more delightful than native support. I'm a bit disappointed that I never shared SummaryField v2 with new abilities, such as datasource-level PartitionBy on any band, or working inside aggregated expressions. Sadly, I have little time to spare. But kudos to DevExpress for doing the right thing and providing a first-class experience! That was the goal I was hoping for when I went public with this project. Perhaps it made a difference. 🎉