LINQ: List of Lists to flattern

Lots of code contains list of lists or dictionary of lists data objects.
Quite often we need to extract a flattern list of data.

The simplest linq staments is

var flatterList = from el in externalList
                  from il in el.innerList
                  select el.code, el.description, il.subcode, il.detailA;

For a complete list of samples, read Use LINQ’s SelectMany Method to “Flatten” Collections .

source: Use LINQ’s SelectMany Method to “Flatten” Collections

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