C#中参数数组、引用参数和输出参数示例详解

namespace Ch6Ex2
{
 class Program
 {
 static int SumVals(params int[] vals)
 {
 int sum = 0;
 foreach (int val in vals)
 {
 sum += val;
 }
 return sum;
 }
 static void Main(string[] args)
 {
 int sum = SumVals(1, 2, 3, 4, 5);
 Console.WriteLine($"Summed Values = {sum}");
 Console.ReadKey();
 }
 }
}

namespace MyProgram
{
 class Program
 {
 static void SwapInts (ref int a, ref int b)
 {
  int temp = b;
  b = a;
  a = temp; 
 }
 static void Main(string[] args)
 {
  int a = 1;
  int b = 2;
  Console.WriteLine($"a = {a}, b = {b}");
  SwapInts(ref a, ref b);
  Console.WriteLine($"a = {a}, b = {b}");
  Console.ReadKey();
 }
 }
}

namespace MyProgram
{
 class Program
 {
 static int MaxValue (int[] intArray, out int maxIndex)
 {
  int maxValue = intArray[0];
  maxIndex = 0;
  for (int i = 0; i < intArray.Length; i++)
  {
  if (intArray[i] > maxValue)
  {
   maxValue = intArray[i];
   maxIndex = i;
  }
  }
  return maxValue;
 }
 static void Main(string[] args)
 {
  int maxIndex;
  int[] intArray = { 12, 45, 23, 77, 73 };
  int maxValue = MaxValue(intArray, out maxIndex);
  Console.WriteLine($"maxValue = {maxValue}, maxIndex = {maxIndex}.");
  Console.ReadKey();
 }
 }
}