Select max age C#

Question

I created a list<T> that contains a collection of objects that have this properties: X, Y, Z

I want to find out which object in the collection has the greatest Z

I tried to use the Max() function but I don't understand how it's used...

Answer 1

Max is used to find the maximum value of a property. Once you have the maximum value you can select those objects whose value matches using the Where clause.

var maxZ = list.Max( obj => obj.Z );
var maxObj = list.Where( obj => obj.Z == maxZ );

Answer 2

To get the object with the greatest Z value you sort on the Z value in descending order and get the first item:

TypeOfObject oldest = list.OrderByDescending(x => x.Z).First();

Edit:
Changed it to use the IEnumerable.OrderByDescending method instead of List.Sort.

Edit 2:
If you want performance, this is about four times faster than the fastest LINQ solution:

int high = Int32.MinValue;
List<TypeOfObject> highest = new List<TypeOfObject>();
foreach (TypeOfObject v in list) {
   if (v.Z >= high) {
      if (v.Z > high) highest.Clear();
      high = v.Z;
      highest.Add(v);
   }
}