参数为数组的方法

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication7
{
    class Program
    {
        static void Main(string[] args)
        {
            int sum1;
            int[] intArray = { 1,2,3};
            sum1 = Test(intArray);
            Console.WriteLine("数组的和是:{0}",sum1);
            Console.ReadKey();
        }
        public static int Test(int[] numbers)
        {
            int sum = 0;
            for (int i = 0; i < numbers.Length; i++)
            {
                sum += numbers[i];
            }
            return sum;
        }
    }
}

 如果参数只是传入数组的个别元素，则可以这个样写：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication7
{
    class Program
    {
        static void Main(string[] args)
        {
            int sum1;
            int[] intArray = { 1,2,3};
            sum1 = Test(intArray[0],intArray[2]);
            Console.WriteLine("数组的和是:{0}",sum1);
            Console.ReadKey();
        }
        public static int Test(int a, int b)
        {
            int sum = a + b;
            return sum;
        }
    }
}