C# - Joining All Lists of Lists together [duplicate]

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: google.com/… — rory.ap
– rory.ap, Commented Nov 11, 2016 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
– rory.ap, Commented Nov 11, 2016 at 13:28
@ManfredRadlwimmer -- even more reason he should know how to ask... — rory.ap
– rory.ap, Commented Nov 11, 2016 at 13:30

Manfred Radlwimmer · Accepted Answer · 2016-11-11 13:24:47Z

3

You can use SelectMany in Linq for this.

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

edited Nov 11, 2016 at 13:24

Manfred Radlwimmer

13.4k13 gold badges55 silver badges65 bronze badges

answered Nov 11, 2016 at 13:23

eocron

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