C# - Joining All Lists of Lists together

Question

I have a C# app. In this C# app, I have an object that I'll call order. Inside of order is a property called Departments. Inside of Departments is a property called Items. I want to put all Items across all of the Departments into a List. Is there a more elegant solution than this:

var items = new List<Item>();
foreach (var department in order.Departments)
{
    foreach (var item in department.Items)
    {
        items.Add(item);
    }
}

While the above "works". It just seems like I could write it in a more condensed way. Yet, I haven't been able to figure out how.

Thanks,

Is there a reason you chose to post this question instead of googling it first? Or can you modify your question to show evidence that you researched and couldn't find what you were looking for? Here's what I got when I copied your title into google: https://www.google.com/search?q=C%23+-+Joining+All+Lists+of+Lists+together&ie=utf-8&oe=utf-8 — rory.ap, Nov 11 '16 at 13:25
And, I'd like to point out that with a 1.6K rep, you should know how this works by now... — rory.ap, Nov 11 '16 at 13:28
@ManfredRadlwimmer -- even more reason he should know how to ask... — rory.ap, Nov 11 '16 at 13:30

score 3 · Accepted Answer · edited Nov 11 '16 at 13:24

3

You can use SelectMany in Linq for this.

var result = order.Departments.SelectMany(x => x.Items).ToList();

edited Nov 11 '16 at 13:24

Manfred Radlwimmer

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answered Nov 11 '16 at 13:23

eocron

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C# - Joining All Lists of Lists together

1 Answers1