Count and LongCount C# with Example
Count returns the number of elements in an IEnumerable. Count also exposes an optional predicate parameter that allows you to filter the elements you want to count. int[] array = { 1, 2, 3, 4, 2, 5, 3, 1, 2 }; int n = array.Count(); // returns the number of elements in the array int x = array.Count(i => i > 2); // returns the number of elements in the array greater than 2 LongCount works the same way as Count but has a return type of long and is used for counting IEnumerable sequences that are longer than int.MaxValue int[] array = GetLargeArray(); long n = array.LongCount(); // returns the number of elements in the array long x = array.LongCount(i => i > 100); // returns the number of elements in the array greater than 100