C# ref,params,out 修饰符

static void Main(string[] args)
        {

           

            int[] a = { 1, 23, 45 };
            int b;
            int c;
          
            RefParamFun(ref d, ref e);
            Console.WriteLine(d);
            Console.WriteLine(e);
            Console.ReadKey();
        }
        /**
        * ref 方法外
        * 必须赋值
        */
        public static void RefParamFun(ref int  a, ref int b )
        {
            a = a + b;
            b = a - b;
            a = a - b;
        }

static void Main(string[] args)
        {
            paramsPamFun(2, 2, 3, 4, 5);

            Console.ReadKey();
        }
		/**
         * 可变数组参数
         */
        public static void paramsPamFun(int a ,params int [] b)
        {
            Console.WriteLine(a);

            for (int i = 0; i < b.Length; i++)
            {
                Console.WriteLine(b[i]);
            }
        }

static void Main(string[] args)
        {

          

            int[] a = { 1, 23, 45 };
            int b;
            int c;
            OutParamFun(a, out  b, out c);
            Console.WriteLine(b);
            Console.WriteLine(c);

           

            Console.ReadKey();
        }
        /**
         * out 就是把参数传出去
         * 方法内必须赋值
         */
        public static void OutParamFun(int[] a, out int b ,out int c)
        {
            b = a[0];
            c = a[1];
        }