Count elements with int < 5 in List<T>

Question

I have a List<int> and need to count how many elements with (value < 5) it has - how do I do this?

Answer 1

Count() has an overload accepting Predicate<T>:

int count = list.Count(x => x < 5); 

See MSDN

Answer 2

Unlike other answers, this does it in one method call using this overload of the count extension method:

using System.Linq;  ...  var count = list.Count(x => x < 5); 

Note that since linq extension methods are defined in the System.Linq namespace you might need to add a using statement, and reference to System.Core if it's not already there (it should be).

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See also: Extension methods defined by the Enumerable class.