IntegerArrayOperationOperate Method

public static int[] Operate(
	Func<int, int> func,
	int[] operands
)

Public Shared Function Operate ( 
	func As Func(Of Integer, Integer),
	operands As Integer()
) As Integer()

public:
static array<int>^ Operate(
	Func<int, int>^ func, 
	array<int>^ operands
)

static member Operate : 
        func : Func<int, int> * 
        operands : int[] -> int[] 

using System;
using SampleClassLibrary.Advanced;

namespace SampleClassLibrary.CodeExamples.Advanced
{
    public class IntegerArrayOperationExample  
    {
        public void Main()
        {
            // Define an operator that squares its operand
            Func<int, int> square = (int operand) => operand * operand;

            // Define an array of operands
            int[] operands = new int[3] { 2, 4, 8 };

            // Operate on it
            int[] results = IntegerArrayOperation.Operate(square, operands);

            // Show results
            for (int i = 0; i < results.Length; i++)
            {
                Console.WriteLine(
                    "The result of squaring {0} is {1}.",
                    operands[i],
                    results[i]);
            }

            // Check that an operator cannot be null
            try
            {
                IntegerArrayOperation.Operate(null, new int[1]);
            }
            catch (Exception e)
            {
                Console.WriteLine();
                Console.WriteLine("Cannot apply a null function:");
                Console.WriteLine(e.Message);
            }

            // Check that an array of operands cannot be null
            try
            {
                IntegerArrayOperation.Operate(square, null);
            }
            catch (Exception e)
            {
                Console.WriteLine();
                Console.WriteLine("Cannot apply a function to a null array:");
                Console.WriteLine(e.Message);
            }

        }
    }
}

// Executing method Main() produces the following output:
// 
// The result of squaring 2 is 4.
// The result of squaring 4 is 16.
// The result of squaring 8 is 64.
// 
// Cannot apply a null function:
// Value cannot be null.
// Parameter name: func
// 
// Cannot apply a function to a null array:
// Value cannot be null.
// Parameter name: operands