How to determine the greatest value in a collection of items?

Question

Using the following simple Item class:

class Item
{
    public int Value { get; set; }
}

And this list of items:

var items = new List<Item>();

items.Add( new Item() { Value = 1 } );
items.Add( new Item() { Value = 2 } );
items.Add( new Item() { Value = 3 } );

How to tell the greatest value in all items?

How to determine which Item in the list has the greatest value?

Answer 1

Using LINQ

items.Max(v => v.Value)

Items containing greatest value

var max = items.Max(v => v.Value);
var x = items.Where(v => v.Value == max);

However, MaxBy extension method suggested by devdigital will iterate the collection only once

Answer 2

And how to directly tell the greatest value in all items?

You can use the Max standard query operator:

var maxValue = items.Max(i => i.Value);

How to determine which Item in the list has the greatest value?

Check out morelinq for the MaxBy extension

Answer 3

Enumerable.max:

http://msdn.microsoft.com/en-us/library/system.linq.enumerable.max.aspx

Answer 4

public class ItemEvaluator
{
    public int Highest { get { return highest; } }
    public int Lowest { get { return lowest; } }

    public void Add(Item item)
    {
        highest = item.Value > highest ? item.Value : highest;
        lowest = item.Value < lowest ? item.Value : lowest;
        items.Add(items);
    }

    private List<int> items = new List<int>();
    private int lowest;
    private int highest;
}

public class Item
{
    public int Value { get; set; }  
}