static void Main(string[] args)
        {
            //聲明
            int value;
            string strOutValue;

            //調用函數
            //函數的參數有兩個返回的值
            ReturnMulValue(out strOutValue,out value);

            Console.WriteLine("Call ReturnMulValue(out string strOut, out int i)");
            Console.WriteLine("value = {0:N}", value);//value = 1.00
            Console.WriteLine("Out string value = " + strOutValue); //Out string value = out function

            //調用函數 http://www.cnblogs.com/roucheng/
            //函數原返回值與參數中均得到返回的值
            value = ReturnMulValue(out strOutValue);

            Console.WriteLine("Call ReturnMulValue(out string strOut)");
            Console.WriteLine("value = {0:N}", value);//value = 2.00
            Console.WriteLine("Out string value = " + strOutValue);//Out string value = out function 2

            //聲明
            int[] outArr;
            //調用函數
            //函數返回數組
            ReturnMulArr(out outArr, out value);

            Console.WriteLine("Call ReturnMulArr(out int[] arr, out int i)");
            Console.WriteLine("value = {0:N}", value);//value = 3.00
            Console.WriteLine("Out arr value ");

            for (int j = 0; j < outArr.Length; j++)
            {
                Console.Write(outArr[j]);//12345
            }
        }

        /// <summary>
        /// 返回多個值，原函數返回空
        /// </summary>
        /// <param name="strOut">使用out關鍵字返回的字符串</param>
        /// <param name="i">使用out關鍵字返回的數值</param>
        static void ReturnMulValue(out string strOut, out int i)
        {
            i = 1;
            strOut = "out function";
        }

        /// <summary>
        /// 返回多個值，原函數返回數值
        /// </summary>
        /// <param name="strOut">使用out關鍵字返回的字符串</param>
        /// <returns>原函數直接返回的數值</returns>
        static int ReturnMulValue(out string strOut)
        {
            int i = 2;
            strOut = "out function 2";
            return i;
        }

        /// <summary>
        /// 返回數組
        /// </summary>
        /// <param name="arr">使用out關鍵字返回的數組</param>
        /// <param name="i">使用out關鍵字返回的數值</param>
        static void ReturnMulArr(out int[] arr, out int i)
        {
            arr = new int[5] { 1, 2, 3, 4, 5};
            i = 3;
        }