linq Count

public static void Count()
        {
            // linq Count - Simple
            int[] factorsOf300 = { 2, 2, 3, 5, 5 };

            int uniqueFactors = factorsOf300.Distinct().Count();

            Console.WriteLine("There are {0} unique factors of 300.", uniqueFactors);

            // linq Count - Conditional
            int[] numbers = { 5, 4, 1, 3, 9, 8, 6, 7, 2, 0 };

            int oddNumbers = numbers.Count(n => n % 2 == 1);

            Console.WriteLine("There are {0} odd numbers in the list.", oddNumbers);
        }

Output

linq Aggregate Operators

• Count
• Sum
• Min
• Max
• Average
• Aggregate