Lambda expression for nested foreach

Question

how can I write lambda expression for the following nested foreach loops:

var temp= new List<Items>();
foreach (var item in dto.Items)
{
    temp.Add(item);
    foreach (var child in item.Children)
    {
      temp.Add(child);
   }
}

Do you only want the top level item and their children? What about the "grandchildren"? Does the order matter? — Jon Skeet
– Jon Skeet, Commented Mar 25, 2016 at 9:01
I just want top level item and their children. Order is not matter. — ruud
– ruud, Commented Mar 25, 2016 at 9:02

Domysee · Accepted Answer · 2016-03-25 09:05:23Z

5

dto.Items.SelectMany(item => item.Children).Concat(dto.Items);

should do it.

Edit:

As xanatos mentioned, if you want to have the same order as your loops produce, you should use this instead:

dto.Items.SelectMany(item => new[] { item }.Concat(item.Children))

edited Mar 25, 2016 at 9:05

answered Mar 25, 2016 at 9:00

Domysee

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