How to Foreach() list of lists?

Question

How to foreach this list to get coordinates (X,Y) of Two shapes from json file:

public List<List<List<List<double>>>> coordinates { get; set; }

Where does your problem deal with JSON. Correct your tags please ;) — Mainz007
– Mainz007, Commented Dec 5, 2014 at 12:39
Out of curiosity.. can you post the JSON file? that is some really nasty nesting. — Faris Zacina
– Faris Zacina, Commented Dec 5, 2014 at 12:48

quadroid · Accepted Answer · 2014-12-05 12:45:57Z

2

you can go with the following

foreach(var i in coordinates.SelectMany(x => x).SelectMany(x => x).SelectMany(x => x))
{

}

or you just box foreach calls, but i don't think a List of List of Lists etc is a good idea, what problem are you trying to solve with this?

answered Dec 5, 2014 at 12:45

quadroid

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1 Comment

CodesInChaos Over a year ago

That's once too often, you only need 3 to reduce 4D to 1D.

Martin Brown · Accepted Answer · 2014-12-05 13:00:23Z

1

The old school way would be like this:

foreach (List<List<List<double>>> listA in coordinates)
    foreach (List<List<double>> listB in listA)
        foreach (List<double> listC in listB)
            foreach (double value in listC)
            {
                // Do something with double value
            }

answered Dec 5, 2014 at 13:00

Martin Brown

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Comments

Faris Zacina · Accepted Answer · 2014-12-05 13:11:25Z

0

The other answers resolve your problem, but If you need only the inner list of coordinates, i would recommend extracting that information at serialization time (preparing the document upfront) or at deserialization time using JSON.NET or ServiceStack.Text into a more manageable structure.

That will prevent the nasty code with x foreach loops or SelectMany statements, which are also loops internally because that kind of code is algorithmic hell.

answered Dec 5, 2014 at 13:11

Faris Zacina

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