Question

I have 2 entities:

class A {
    ...
}
class B {
    IEnumerable<B> bs;
}

I have array of A’s and I need to get all the B’s in one IEnumerable. I can do:

IEnumerable<A> as=....;

IEnumerable<IEnumerable<B>> bss=as.Select(x=>x.bs);

IEnumerable<B> all=null;
foreach (IEnumerable<B> bs is bss) {
    if (all==null) { all=bs; }
    else { all=all.Contact(bs); }
}

I want to know if there is shorter way to do this.

Thanks

Answer 1

You can Use SelectMany that will concatenate all the IEnumerables together

var all = as.SelectMany(a => a.bs);