Linq Distinct on list

Question

I have a list like this:

List people

age   name
1     bob
1     sam
7     fred
7     tom
8     sally

I need to do a linq query on people and get an int of the number distinct ages (3)

int distinctAges = people.SomeLinq();

how? how?

Answer 1

Select out the age, then use Distinct and Count.

 var ages = people.Select( p => p.Age ).Distinct().Count()

Or you could use GroupBy and Count

 var ages = people.GroupBy( p => p.Age ).Count();