Return min/max number in nested list

Question

I'm trying to find the min/max number within a nested list using Linq.

An example class would be:

public class ListA { public HashSet<HashSet<int>> nestedList; public ListA() { nestedList = new HashSet<HashSet<int>>() { new HashSet<int> { 1, 3, 5, 7 }, new HashSet<int> { 2, 12, 7, 19 }, new HashSet<int> { 6, 9 , 3, 14 } }; } public int MaxNumber { // return the highest number in list } }

In the example above, the minimum number would be 1 and the max number 19.

I'm struggling to get anything to get valid syntax. Anyone help?

Duplicate of Linq expression to find the max value of a List<List<int>>?. — CodeCaster
– CodeCaster, Commented Dec 4, 2017 at 12:19

mjwills · Accepted Answer · 2017-12-04 12:20:51Z

SelectMany and Max will likely produce the result you desire.

Also consider using DefaultIfEmpty (with whatever default makes sense for your context) - this will ensure that Max doesn't throw an exception if nestedList is empty.

public int MaxNumber { get { return nestedList.SelectMany(z => z).DefaultIfEmpty(0).Max(); } }

nvoigt · Accepted Answer · 2017-12-04 12:17:26Z

2

nestedList.SelectMany(item => item).Max();

and

nestedList.SelectMany(item => item).Min();

answered Dec 4, 2017 at 12:17

nvoigt

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1 Comment

John Ohara Over a year ago

How embarrassing - I was trying to use a second Select after SelectMany - thanks.

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