Question

If I have used LINQ’s GroupBy() method to create a grouped enumeration, is it possible to regroup that result under another key system? That is, if I grouped all of the objects by property X for one part of the code, is it possible to subsequently group that collection by property Y of property X at a later point in the code?

Answer 1

I didn’t read your question, but this works:

var groupedByProperty1 = myEnumerable.GroupBy(x => x.Property1);

var groupedByProperty2 = groupedByProperty1.SelectMany(g => g)
                                           .GroupBy(x => x.Property2);

Is that what you’re looking for by any chance?