关于数组传递以及ref，out的例子

数组传递，ref与out的区别是，out可以先不初始化，等传递到调用方法后，再初始化。

ref传递，会影响数组原始值。

下面是一个例子：

        static void Main(string[] args)
        {
            int[] firstArray = { 1, 2, 3 };
            int[] firstArrayCopy = firstArray;
            Console.WriteLine("Test passing firstArray reference by  
                                        value");
            Console.WriteLine("\nContents of firstArray before calling  
                                        FirstDouble:\n\t");
            for (int i = 0; i < firstArray.Length; i++)
                Console.Write("{0} ", firstArray[i]);
            FirstDouble(firstArray);
            Console.WriteLine("\nContents of firstArray after calling 
                                       FirstDouble:\n\t");
            for (int i = 0; i < firstArray.Length; i++)
                Console.Write("{0} ", firstArray[i]);
            if (firstArray == firstArrayCopy)
                Console.WriteLine("\n\nThe references refer to the 
                                           same array");
            else
                Console.WriteLine("\n\nThe references refer to the 
                                          different array");

            int[] secondArray = { 1, 2, 3 };
            int[] secondArrayCopy = secondArray;
            Console.WriteLine("\nTest passing secondArray reference 
                                       by reference");
            Console.WriteLine("\nContents of secondArray before 
                                       calling SecondDouble:\n\t");
            for (int i = 0; i < secondArray.Length; i++)
                Console.Write("{0} ", secondArray[i]);
            SecondDouble(ref secondArray);
            Console.WriteLine("\nContents of secondArray after calling 
                                        SecondDouble:\n\t");
            for (int i = 0; i < secondArray.Length; i++)
                Console.Write("{0} ", secondArray[i]);
            if (secondArray == secondArrayCopy)
                Console.WriteLine("\n\nThe references refer to the 
                                           same array");
            else
                Console.WriteLine("\n\nThe references refer to the 
                                           different array");
        }

        private static void FirstDouble(int[] array)
        {
            for (int i = 0; i < array.Length; i++)
                array[i] *= 2;
            array = new int[] { 11, 12, 13 };
        }

        private static void SecondDouble(ref int[] array)
        {
            for (int i = 0; i < array.Length; i++)
                array[i] *= 2;
            array = new int[] { 11, 12, 13 };
        }

运行结果如下：