1 using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Text; 5 using System.Threading.Tasks; 6  7 namespace ConsoleApplication7 8 { 9     class Program10     {11         static void Main(string[] args)12         {13             int sum1;14             int[] intArray = { 1,2,3};15             sum1 = Test(intArray);16             Console.WriteLine("数组的和是:{0}",sum1);17             Console.ReadKey();18         }19         public static int Test(int[] numbers)20         {21             int sum = 0;22             for (int i = 0; i < numbers.Length; i++)23             {24                 sum += numbers[i];25             }26             return sum;27         }28     }29 }

 如果参数只是传入数组的个别元素，则可以这个样写：

1 using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Text; 5 using System.Threading.Tasks; 6  7 namespace ConsoleApplication7 8 { 9     class Program10     {11         static void Main(string[] args)12         {13             int sum1;14             int[] intArray = { 1,2,3};15             sum1 = Test(intArray[0],intArray[2]);16             Console.WriteLine("数组的和是:{0}",sum1);17             Console.ReadKey();18         }19         public static int Test(int a, int b)20         {21             int sum = a + b;22             return sum;23         }24     }25 }