Largest key of nested dictionary in C#

Question

Tried searching online. But couldn't find an answer:

public class A
{
    public Dictionary<int, string> Dict { get; } = new Dictionary<int, string>();
}

var list = new List<A>();
var a = new A();
a.Dict.Add(1, "A");

var b = new A();
b.Dict.Add(2, "A");

list.Add(a);
list.Add(b);

How to get the maximum and minimum key in dictionary.

max key is 2 and min key is 1.

var max = list.Max(e => e.Dict.??); //

Does this answer your question? [Get the largest key in a dictionary](https://stackoverflow.com/questions/8315154/get-the-largest-key-in-a-dictionary) — Pavel Anikhouski, Jun 13 '20 at 14:47
There is no way to do this efficiently, if you are interested for efficiency. — Theodor Zoulias, Jun 13 '20 at 16:58

score 0 · Accepted Answer · answered Jun 13 '20 at 13:51

0

You can use Dictionary.Keys property for this:

var max = list.Max(e => e.Dict.Keys.Max())

or

var max = list.SelectMany(e => e.Dict.Keys).Max()

answered Jun 13 '20 at 13:51

Guru Stron

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Largest key of nested dictionary in C#

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