Create list of tuples with data from nested lists with Linq

Question

I have a list of objects which contains a list of other objects.

List<Parent> Ps;

Parent:

class Parent 
{
   List<Childs> Cs;
}

Is there a possibility to create with Linq a list of tuples of parents and childs?

Tuple<Parent, Child>

Tim Schmelter · Accepted Answer · 2016-03-04 08:32:39Z

3

You can use Enumerable.SelectMany:

List<Tuple<Parent, Child>> parentChilds = Ps
    .SelectMany(p => p.Cs.Select(c => Tuple.Create(p, c)))
    .ToList();

This is equal to this:

var pcQuery = from parent in Ps
              from child in parent.Cs
              select Tuple.Create(parent, child);
List<Tuple<Parent, Child>> parentChilds = pcQuery.ToList();

edited Mar 4, 2016 at 8:32

answered Mar 4, 2016 at 8:24

Tim Schmelter

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1 Comment

JJS Over a year ago

thanks for including comprehension and lambda syntax

jannis · Accepted Answer · 2016-03-04 08:26:56Z

2

var tuples = from p in Ps from c in p.Cs select Tuple.Create(p, c);

answered Mar 4, 2016 at 8:26

jannis

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